HDTenEightyP/NetNews huggingface dataset:
Newsgroups: rec.photo
From: acs@csri.toronto.edu (Alvin Chia-Hua Shih)
Subject: Re: Which lenses report focusing distance electronically?
Date: 29 Dec 92 02:38:46 GMT

In <1992Dec28.205950.16887@walter.bellcore.com> jchen@wind.bellcore.com (Jason Chen) writes:

>In article <TJWU.92Dec28153541@carbonara.mit.edu> tjwu@athena.mit.edu (Thomas J Wu) writes:
>>Are Nikon's D-series lenses the only AF lenses that report focus distance
>>to the camera body?  Do any Canon, Minolta, or third-party lenses do this?

>Huh? If not how does TTL flash work?

TTL flash works by measuring the light reflected off the film emulsion
while the shutter is open.  The TTL sensor is located in the bottom of
the mirror box in most cameras.  No distance information is required,
just as no distance information was required for (ambient) TTL metering
in pre-AF cameras.

(Have *you* seen any flashmeters, reflective or incident, that require
the distance information to be punched in?)

>Jason Chen

ACS
-- 
 ___ ___ ___ ______________________________________________________________
|   |   | __|      Democracy is not a way of getting better solutions.     |
| - | --|__ |           It's just a way to spread the blame.               |
|_|_|___|___|______________________________________________________________|
Alvin_C._Shih____________________acs@csri.utoronto.ca______________________|
Newsgroups: rec.photo
From: pd@sics.se (Per Danielsson)
Subject: Re: Photo CD
Organization: Swedish Institute of Computer Science, Kista
	<1gr4nmINNc1t@darkstar.UCSC.EDU><PD.92Dec20184108@horus.sics.se>
	<92359.000218I18BC@CUNYVM.BITNET>
Date: Tue, 29 Dec 1992 03:00:49 GMT

In article <92359.000218I18BC@CUNYVM.BITNET> I18BC@CUNYVM.BITNET (CUNY/Spartacus) writes:

>In article <PD.92Dec20184108@horus.sics.se>, pd@sics.se (Per Danielsson) says:
>>
>>Digital (mostly magnetic) media seems to go out of fashion very fast.
>^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>>Have you tried to read a 7-channel tape lately? A punched tape?
>^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>>Can we be certain that somebody a hundred years from now can read a
>^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>>PhotoCD?
>>A print can certainly be viewed a hundred years from now.
			 ^^^^^^^^^^^^^^^^^
>Sorry Per,
>     But you ought to know better than that being a computer person.
>If its digital, it can be transfered to many different digital mediums.

If you can't read the medium you can't transfer the contents.
Think about it. How many persons are willing to go through the trouble
of locating an archaic CD-ROM reader, when they find an old PhotoCD in
the attic of their great grandfathers old house? A hundred years from
now CD-ROMs (and PhotoCDs of course) certainly won't be the most
common form of digital storage, or even common at all. Something
better will always come along and replace the latest digital storage
technique. If everybody remembers to transfer all their bits in time,
then all is well, but that will not happen.

When my great grandchildren find my prints they can look at them right
away.
--
Per Danielsson				pd@sics.se
Swedish Institute of Computer Science, PO Box 1263, S-164 28 KISTA, SWEDEN
From: cd2t+@andrew.cmu.edu (Christophe Dumay)
Newsgroups: rec.photo
Subject: looking for a telephoto zoom
Date: 31 Dec 92 12:17:00 GMT
Article-I.D.: andrew.sfEr5QG00iV2A1z74P
Organization: Carnegie Mellon, Pittsburgh, PA

Hi,

First of all : happy new year !

After several posts and a lot of advices and informations (thanks :-)
I have decided to get a FM2 body with the 24mm MF Sigma, the 28-70 Nikkor.
I will also try to get a macro lense (55 Nikkor, 90 Tamron or tokina) and
most probably a telephoto zoom to complete my equipment.

I am considering the following zooms :

70-210 4/5.6 AF Nikkor
70-210 4/5.6 APO UC MF or AF Sigma
70-210 3.5/4.5 AP0 MF or AF Sigma
75-300 4.5/5.6 MF or AF Sigma
80-200 2.8 ATX MF Tokina
100-300 4.0 ATX MF Tokina

I suppose that tests regarding some of these lenses have been reported
during the past few years in the different photography periodicals.
If someone can provide me with the conclusions of the tests, my choice
may become really easier !

I think that the design (and the performances) of the MF Tokinas are not
the same as for the AF version (but I don't think I can afford one of
the AF ATX). This may be true with the Sigma zooms too.

If you feel you can help, please E-mail me at : cd2t+@andrew.cmu.edu

If you want informations about the zooms qoted above, let me know. I will
either forward the informations I will recieve or post a summary if enough
people are interested.

Thank you in advance.

       Christophe DUMAY.
From: bu890@cleveland.Freenet.Edu (Brian Segal)
Newsgroups: rec.photo
Subject: Re: what film to shoot?
Date: 3 Jan 1993 22:41:20 GMT
Organization: Case Western Reserve University, Cleveland, Ohio (USA)
NNTP-Posting-Host: hela.ins.cwru.edu


Here's how to determine the llighting crossover:

If you have a lightmeter that reads flash as well as ambient light,
set the meter for the aperture you will be using for the flash and se
what shutter speed it requires to properly expose the room without flash
(i.e. the ambient light exposure inndex for the room).

You will most likely find that the shutter speed is quite slow compared to
the sync speed you will be using for the flash.  Indeed, if you wanted to
match them 1:1 you would have to shoot with flash with your aperture set for
the flash and shutter speed set for the ambient light.  Your aperture
will be determined by the Guide Number of your flash, of wider if you
want to limit depth of field.

It will probably be the case that you will be able to shoot at a faster speed
than will record enough ambient light to bias the film with incandescent
lighting.

It is also possible to expose for ambient llight, but to under expose a bit and pop    
pop the flash to cool off the light...but this takes experimentation unless
you have a meter like the Minolta flashmeterIV which has an analyse function
for just this kind of situation.


brian
Newsgroups: rec.photo
From: buck@ra.nrl.navy.mil (Loren Buchanan)
Subject: Re: Photo CD
Followup-To: rec.photo
Summary: Archival forms are coming
Keywords: PhotoCD archival
Organization: Naval Research Lab, Washington, DC
Date: Thu, 24 Dec 1992 14:11:11 GMT

In article <1992Dec23.172708.10121@spdcc.com> joe@spdcc.com (Joseph Francis) writes:
>I backtracked through the message tree and found that the original
>question was, indeed, archival storage. The feed I get on the french
>(IRCAM) machine is quite strange, I think. I also didn't discuss
>plastic fracture if photographic paper expands and contracts with
>different humidities...

In regards to archival properties of Photo CDs, archival forms are being
developed.  Six months ago when I started to contact vendors about write
once CDs, they all claimed a useful life of at least 10 years.  Kodak has
always claimed much longer life spans.  Recently DIC (one of the makers of
write once blanks) has been claiming a useful life of over 100 years (this
assumes storage in a dark place).  Remember that what makes write once CDs
work is a dye layer that is modified by a laser that is not strong enough
to modify the gold behind the dye.

Now if you want true archival class PhotoCDs, you will need to have physically
stamped CDs made.  There is work underway to develop standards for testing
stamped CDs that will ensure a useful life in excess of a thousand years.

B Cing U

Buck

-- 
Loren Buchanan (buck@curie.nrl.navy.mil) | #include <standard.disclaimer>
NRL Code 5842, 4555 Overlook Ave.        | #include <computer.graphics>
Washington, DC 20375      (202) 767-3884 | #include <electronic.music>
Phone tag, America's fastest growing business sport.
From: pd@sics.se (Per Danielsson)
Newsgroups: rec.photo
Subject: Re: Which old Pentax S/M models ?
Date: 30 Dec 92 20:39:55 GMT
Organization: Swedish Institute of Computer Science, Kista

In article <TSOS.242.725735866@uni-duesseldorf.de> TSOS@uni-duesseldorf.de (Detlef Lannert) writes:

>The ES II meets these requirements (and its predecessor, the ES). 
>[..]
> metering at open aperture.

But only if the lens is made for open aperture metering. If the lens
is too old (before circa 1972-73), it can only be used with stop-down
metering.

>Using the K adaptor on a bayonet body, as another poster suggested, 
>restricts you to stop-down metering and manual aperture control and is 
>not very convenient.

Yes, but chances are the lenses have to be used with stop-down
metering on a Pentax ES anyway.
--
Per Danielsson				pd@sics.se
Swedish Institute of Computer Science, PO Box 1263, S-164 28 KISTA, SWEDEN
Newsgroups: rec.photo
From: dp@world.std.com (Jeff DelPapa)
Subject: Re: New question for Photo Techies
Organization: The World Public Access UNIX, Brookline, MA
Date: Thu, 24 Dec 1992 09:30:34 GMT

In article <1992Dec23.160957.16737@news.th-darmstadt.de> D98O@BR1.HRZ.TH-DARMSTADT.DE (Jochen Fuehrer) writes:
>In <1992Dec23.044712.8935@digi.lonestar.org> gpalo@digi.lonestar.org writes:
>
>> Let the camera record the number of frames exposed on the film.  This way
>> you could easily unload a roll midway through, change film, then go back
>> to the original partially exposed roll and go automatically to the next
>> available unexposed frame.  
>
>I guess a pencil and a piece of paper will do the same job (at least they
>do for me) at a fraction of the cost. The only disadvantage: You have to
>push the button n times. :-)

The problem with running film in and out of the cassette several
times, is a greatly increased risk of scratching the film.  Especially
since the film will be removed from the camera and stored (tongue out)
in a random environment, the chance of collecting a sharp piece of
dust in the felt light-trap will be high.  Occasional swapping of a
roll in semi-emergency conditions should be alright, but making it a
simple function would encourage regular swapping and would result in
lots of scratched film.

<dp>
Newsgroups: rec.photo
From: acs@csri.toronto.edu (Alvin Chia-Hua Shih)
Subject: Re: pinhole camera
Date: 28 Dec 92 05:12:58 GMT

In <1992Dec28.032027.18614@ultb.isc.rit.edu> andpph@ritvax.isc.rit.edu writes:

				[...]

>It is somewhat amazing that in these days of ultra-sophisticted cameras and
>technology there seems to be a great many pinhole enthusiasts around! [...]
>  
Probably because these ultra-sophisticated cameras are becoming too
hard to use and are too expensive.

I guess if you factor in managing camera shake, then pinhole cameras are
about even.  :-)

>l8tr,
>andy

ACS
-- 
 ___ ___ ___ ______________________________________________________________
|   |   | __|      Democracy is not a way of getting better solutions.     |
| - | --|__ |           It's just a way to spread the blame.               |
|_|_|___|___|______________________________________________________________|
Alvin_C._Shih____________________acs@csri.utoronto.ca______________________|
From: watters@mendel.genetics.washington.edu (Mike Watters)
Newsgroups: rec.photo
Subject: For Sale: Nikon F w/ meter prism & lens
Date: 30 Dec 1992 20:22:28 GMT
Organization: University of Washington
NNTP-Posting-Host: mendel.genetics.washington.edu

For Sale:
	Nikon F w/ FTn finder (meter active) and lens

	Chrome Nikon F
	Photomic FTn finder with active meter
	43-86 f3.5 Nikkor zoom (AI)

	$300 OBO (offers on whole unit prefered)
	Email for conditions 

mike

--
Mike
watters@genetics.washington.edu
Dept of Genetics, Univ of Washington  Seattle
(d) 206-543-1934   (e) 206-361-1156 
Newsgroups: rec.photo
From: ka1gt@cbnewsm.cb.att.com (robert.m.atkins)
Subject: EOS battery use - Some hard numbers
Organization: AT&T
Distribution: na
Date: Wed, 23 Dec 1992 23:43:12 GMT

I just measured some current draw data for an EOS 630 with a 35-135 USM lens
which might be of interest:

Lens focusing (from infinity to closest focus)  200mA for 0.25 seconds
Film winding (1 frame)                          600mA for 0.25 seconds
Mirror fliping up & shutter release             350mA for 0.1 seconds
Exposure determination (i.e. depress shutter
release 1/2 way to give exposure reading)       100mA for 6 seconds
Film rewind (36 exposures)                      450mA for 8.5 seconds
Any function button                             100mA
(current is drawn until function is set)

Maximum current drawn was a 1.6 amp transient on motor start up

Adding up these numbers you find that to focus from infinity to closest
focus, get an exposure reading and hold it for 5 seconds, release the
shutter and wind on one frame takes about 835 mA.seconds. Let's be
cautious and say I missed a few transients and assume the real value is
1000mA.seconds. To expose a full roll of 36 exposures and rewind it would
then require close to 40,000 mA seconds. A 2CR5 has a claimed capacity of
1300 mA.hr (= 4,680,000 mA.seconds), thus we should be able to get about
115 36 exposure rolls from a 2CR5!! However, if you focus a couple of times 
and take 3 exposure readings every time you take a shot (which is not all
that unusual for the kind of work I do), then this number will drop by
a factor of about 3, to maybe 40 rolls per battery. This still seems a little
optimistic - maybe 2CR5s are not really 1300 mA.hr at the current draw rates
found in the camera?

The numbers do point out a few things thought. First, the small USM lenses
do not draw much power, so there would be little to be gained by using
manual focus. Second, the real power draw is when the shutter is depressed
1/2 way to get the exposure reading. If you don't take a picture you get
100mA draw for 6 seconds. If you do take a picture the current draw stops
after the frame is wound (i.e. less than the full 6 seconds). Lastly, there
is significant discrepancy between the claimed capacity of 2CR5s and the
resultant theoretical number of rolls of film you should be able to get
through the camera.

Happy Holidays to all
 
===============================================================
Bob Atkins  AT&T Bell Labs  email (direct)  att!clockwise!rma
===============================================================
Newsgroups: rec.photo
From: jchen@wind.bellcore.com (Jason Chen)
Subject: Re: 8008s/801s Questions
Reply-To: jchen@wind.bellcore.com (Jason Chen)
Organization: Bellcore, Morristown, NJ
Date: Thu, 24 Dec 92 03:56:11 GMT

In article <PHR.92Dec23135556@napa.telebit.com> phr@telebit.com (Paul Rubin) writes:
>
>When I do any important shooting, I take an FM2 along with my 8008.
>That way, if one of them breaks, I still have the FM2...

Sounds like a good advice for all 8008 owners :-).

Newsgroups: rec.photo
From: jturley@netcom.com (James Turley)
Subject: Re: Lithiums vs. alkalines (was Re: was going to get 8008s but EOS 10s recommended)
Organization: Netcom - Online Communication Services  (408 241-9760 guest) 
Date: Tue, 22 Dec 1992 06:48:27 GMT

BTW...Price club has 2CR5's for about $6 (maybe less)...check it out!
 

Newsgroups: rec.photo
From: phr@telebit.com (Paul Rubin)
Subject: Re: Anyone do their own C41 developing?
Organization: Telebit Corporation; Sunnyvale, CA, USA
	<1992Dec29.192447.8920@news.weeg.uiowa.edu>
	<PHR.92Dec30182337@napa.telebit.com>
	<1992Dec31.055057.27213@jarvis.csri.toronto.edu>
Date: Thu, 31 Dec 1992 21:17:19 GMT

    A friend of mine tells me that there are little machines
    photojournalists use to do developing of negatives on-the-spot
    (something like the Polachrome machines, I think).  I have no idea if
    it's colour or not.

Porters' sells a little daylight tank that uses a 1 bath develop+fix
chemistry and you develop the film inside the cartridge.  I used
to have one of these and it was kind of neat.  It was for black
and white only and only worked for 20 exposure rolls (maybe
would work for 24) because there had to be enough room in the
cartridge for the chemical to get to all the film.
From: lakhindr@ESD.3Com.COM (Lakhinder Walia)
Newsgroups: rec.photo
Subject: Re: 30"x40" enlargements..
Date: 22 Dec 92 23:37:48 GMT
Distribution: rec

my remarks in capitals,below, for clarity.
-lakhinder walia

kassover@rumsey.crd.ge.com (David Kassover) writes:

>In article <1992Dec21.213822.1996@craycos.com> sog@craycos.com (Steve Gombosi) writes:
>>In article <lakhindr.724699675@bowmore.NSD.3Com.COM> lakhindr@ESD.3Com.COM (Lakhinder Walia) writes:
>>>Hi, this size of enlargement from a 8'x10' negative..? No >>
>>Gee, I *might* be able to transport an 8ftx10ft camera if I got
>>a trailer, but I don't have anough room for the enlarger (especially
>>since the lens would have a 12.8 foot focal length) in my darkroom.
>>And I was hoping to get into large format ;-).

>No, you don't understand, your trailer *is* the camera.  With
>some suitable cleverness, and perhaps some influence with the
>DOT, you can have a full range of swings and tilts and such.
>Interchangeable backs and bag bellows might be a problem.  Then
>again, if you look through the Yellow Pages, you might find a
>tentmaker or two...

I LIKE THE IDEA..! MAY BE WE WILL HAVE POWER DRIVE CAMERA : WITH 
POWER MOVEMENTS.. :-) 
YOU SIT IN YOUR CAR AND LOOKING INTO YOUR REAR VIEW MIRROR, FOCUS THE 
LENS-- WITH SOME REMOTE KNOB OF COURSE..!
OF COURSE NO TRIPOD NECESSARY. TO REDUCE VIBRATION: STOP THE ENGINE.
CHANGING THE BACK WILL BE MORE PAINFUL THAN CHANGING A TIRE.
I HAVE NO IDEA HOW WILL YOU LOAD A FILM.
I WILL BUY SECOND HAND LENS FROM HUBBLE-TELESCOPE, AFTER THEY COME BACK 
FROM REPLACING IT IN  A NEAR FUTURE SPACE SHUTTLE MISSION.


>If you work the thing like a process camera, you really don't
>need a separate enlarger.


>Somewhat seriously, I heard of some museum or other converting a
>room in a gallery into a true camera obscura, using a pinhole in
>the wall and 8x10 foot Polaroid material...

>I believe this was mostly an academic exercise.  Certainly, if
>one is into Funtian photography, this setup is somewhat
>unflexible...


>8-) if you need them, of course.



>-- 
>David Kassover             "Proper technique helps protect you against
>uupsi!khazad!kassover	          sharp weapons and dull judges."
>kassover@aule-tek.com                   F. Collins
>kassover@ra.crd.ge.com
Newsgroups: rec.photo
From: jake@bony1.bony.com (Jake Livni)
Subject: Re: Fungus on lens
Keywords: fungus
Organization: The Department of Redundancy Department
Date: Thu, 24 Dec 92 01:47:16 GMT

In article <1992Dec22.095521.17861@ncrcae.ColumbiaSC.NCR.COM> appy@churchill.ColumbiaSC.NCR.COM (Pratul.Sharma) writes:

>I have a Pentax ME-super SLR and a 35-105 Tokina Zoom. Both of them are out of
>warranty. The zoom has developed fungus on a few elements. I showed it to a few 
>shops here and the are asking about $75 - $80 to clean it. Now I find that the
>camera's view finder is also developing fungus.

[...]

>do it myself. Also how do I avoid fungus killing other lenses.

Fungus grows in damp air.  Store your lenses and equipment in dryness.
Wrap them in plastic wraps or seal them in airtight containers.  Add a
dessicant like Silica Gel to keep the air inside dry.  I keep my stuff
in Rubbermaid containers with packs of dessicant that I re-dry every
year. 

Fungus also has the nasty habit of moving around, all by itself.
Therefore, if you have fungus on some equipment, you may be
endangering other clean equipment by storing them together.

If you're serious about your stuff, get it all cleaned (even if it
costs money) and then keep it clean.  You may decide that it's not
worth the money; that's your decision.

-- 
Jake Livni  jake@bony1.bony.com              10 years from now, George Bush will
American-Occupied New York                   have replaced Jimmy Carter as the
My opinions only - employer has no opinions. standard of a failed President.
From: kassover@rumsey.crd.ge.com (David Kassover)
Newsgroups: rec.photo
Subject: Re: 30"x40" enlargements..
Date: 22 Dec 92 01:26:07 GMT
Distribution: rec
Organization: nope

In article <1992Dec21.213822.1996@craycos.com> sog@craycos.com (Steve Gombosi) writes:
>In article <lakhindr.724699675@bowmore.NSD.3Com.COM> lakhindr@ESD.3Com.COM (Lakhinder Walia) writes:
>>Hi, this size of enlargement from a 8'x10' negative..? No 
>
>Gee, I *might* be able to transport an 8ftx10ft camera if I got
>a trailer, but I don't have anough room for the enlarger (especially
>since the lens would have a 12.8 foot focal length) in my darkroom.
>And I was hoping to get into large format ;-).

No, you don't understand, your trailer *is* the camera.  With
some suitable cleverness, and perhaps some influence with the
DOT, you can have a full range of swings and tilts and such.
Interchangeable backs and bag bellows might be a problem.  Then
again, if you look through the Yellow Pages, you might find a
tentmaker or two...

If you work the thing like a process camera, you really don't
need a separate enlarger.


Somewhat seriously, I heard of some museum or other converting a
room in a gallery into a true camera obscura, using a pinhole in
the wall and 8x10 foot Polaroid material...

I believe this was mostly an academic exercise.  Certainly, if
one is into Funtian photography, this setup is somewhat
unflexible...


8-) if you need them, of course.



-- 
David Kassover             "Proper technique helps protect you against
uupsi!khazad!kassover	          sharp weapons and dull judges."
kassover@aule-tek.com                   F. Collins
kassover@ra.crd.ge.com
Newsgroups: rec.photo
From: geoff@pmafire.inel.gov (Geoff Allen)
Date: Tue, 29 Dec 92 20:16:09 GMT
Organization: Roller Coaster fanatic with no hope for a cure
Subject: Re: Panaromic photo CD images?
Summary: 
Followup-To: 
Organization: Roller Coaster fanatic with no hope for a cure
Keywords: 

briang@atlastele.com (Brian Godfrey) writes:
>   Since the film is standard 35mm film, and the image is actually smaller
>   than a standard 35mm image (probably why it seemed really grainy after
>   being enlarged)

Yeah, that and the cheap plastic lens in the disposable camera.

;^)

>   I should think you would be able to get more of these 
>   shots on a photo-CD than of regular 35mm images.

Geoff

-- 
Geoff Allen          \  Many people come, looking, looking, taking picture....
uunet!pmafire!geoff   \  No good.... Some people come, see. Good!
geoff@pauling.inel.gov \   -- Nepalese Sherpa, quoted by Galen Rowell