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Input:
Question: I'm very new to the hobby and recently received the CPC 800 as a gift.  Can someone recommend what I should buy to magnify the stars and planets
Document: These mounts are more expensive. There is an adaptor "wedge" that can be purchased for the CPC 800, but I have read that users are disappointed with it.Many of us are fascinated with the notion of receiving the ancient photons that have traveled through space for thousands or millions of years, directly into our own eyes.Do not sip on the wine you brought until AFTER the set up and alignment and testing phase is complete! You will need your scruples!
The CPC 800 is portable enough to make this trip. You have to be able to set up very near your car as the scope IS heavy.I find when practicing with the scope in my driveway, the alignment is crucial. I use the 3 star method. I also use an eyepiece with cross hairs, as the alignment star must be exactly in the center of the fov for the best alignment. The better the initial alignment, the better everything goes after that.
I upgraded from a NexStar 6SE to the CPC 800 XTL. The CPC unit is much better designed for planetary astrophotography (unless you are taking pictures directly overhead) as the dual fork provides better support for a DSLR camera attached to a T-adapter or a tele-extededner. The included 8x50 finder is a step-up from the basic reflex sight and once I realized I needed to use both eyes when pointing the scope to a spot it became much easier to use.
Previous alignment systems require for you to point and align it at a bright star that the telescope chooses randomly. There is a chance that the bright star you decide to align your telescope is the wrong bright object. With the new SkyAlign on this telescope, you choose any 3 bright objects in the sky, Moon and planets included. There will never be a shortage of bright objects at any time in the nightsky.
I have had this telescope now for about four months. I have been happy with it. The align software works well. I have had many exciting moments with my wife and children showing them various sky objects. Having this telescope has renewed my love for astronomy. Would definitely recommend to any serious sky observer!
The Celestron 8 inch Schmidt Cassgrain (catadioptic) astronomical telescope isn't the Huble. But it is the bestprice/performance ratio for the serious amateur astronomer. I got it with the full gamut of accessories and power tank. It features a GPS built into one of the mounting forks, most useful. Be sure to get a moon filter as it is really bright. I am pleased with the unit and gladly recommend this telescope most strongly.
I am very unhappy whit Amazon on this particular order as I purchased this scope and received it next day (Amazon Prime)- but less the second box containing the tripod. I contacted Amazon customer service and I was informed 'the tripod is included in the same box as the telescope'.
i.e. I didn't need to 'oversteer' to get the scope to move in the opposite of the last direction it moved.I will likely repurchase this unit (or perhaps the CPC 925/1100 XLT) from another vendor.
the tripod came broken the rings that keep the legs from spreading to far apart where broke where the brace connect to them and sence it was a chrismas present  I was very disappointed I contact celestron  for a brake down of the tripod so I can order the parts and they emailed me back telling me there is no brake down of there tripods I have received the parts for my tripod that was broken thanks
The box containing the telescope tube arrived with significant damage with deep impact holes that penetrated  through the inner box. This is suppose to be a new unit, yet both the outer and inner box are unsealed, The factory tape sealing the box having been cut. In addition to not being sealed the box appears to have been dropped on one of it's corners from a great height and looks like an accordion. I am not even bothering to unpack the box and have requested a replacement unit to be sent out.
Answer: To calculate magnification, divide the focal length of the telescope (2032 mm for the CPC 800) by the focal length of the eyepiece.  If you also add a Barlow to the eyepiece, multiply the result of the preceding step by the Barlow's magnification (some Barlows magnify more than 2x).  The most optimistic rule of thumb I have seen for useful telescope magnification is a maximum of 60x per inch of aperture (480x for the CPC 800), but this requires perfect skies and a perfectly collimated telescope.  I prefer to think in terms of 50x per inch (400x for the CPC 800) as the maximum for my best observing sites and 30x-40x per inch (240x-320x for the CPC 800) for my usual observing sites.  If you magnify too much, the image becomes "mushy" and you can actually lose detail.For planets and the Moon, I typically use a 13-mm TeleVue Ethos, which gives 156x on the CPC 800, and an 8-mm TeleVue Delos, which gives 252x.  My usual observing sites are in California's San Joaquin Valley and range from urban to suburban to semi-rural to rural, but are all below an elevation of 600 feet and are often compromised by haze/smog.  A magnification of 250x is about all these skies can handle, and sometimes even 200x is too much.  Two months ago, from a local shopping center under better than normal skies, I was able to clearly see Hadley Rille and other major features around the Apollo 15 landing site with my 8-mm eyepiece.On the other hand, the high-elevation dark sky sites that I use in the summer (6500 ft to 8200 ft elevation and Bortle Class 1-2) can often take well more than 250x with the CPC 800.  Adding a Barlow to the 13-mm gives me 312x and nice views.  Adding a Barlow to my 10-mm Vixen Lanthanum (which usually stays with my 5" scope) gives me 406x, which has been marginal to OK for me.  I have Barlow'ed the 8-mm, but 504x on the CPC 800 was too much the one time I tried it.No matter how much you try to magnify the stars, they will still be pinpoints in the CPC 800.  It takes professional observatories (sometimes with interferometers) to resolve the handful of nearby large stars into anything more than a dot.  However, high magnification is useful for splitting tight double stars.  The theoretical maximum resolution of the CPC 800 is 0.69 arcseconds (Rayleigh Criterion) and 0.57 arcseconds (Dawes Limit).  Rayleigh is equivalent to true separation, while Dawes is equivalent to the beginning of separation.  As a practical matter, I suggest figuring on 1 arcsecond for typical good conditions and maybe 1.5 arcseconds or less for worse conditions.  BTW, 1 arcsecond is the angle subtended by a lunar crater about 1.16 miles across (based on the average center-to-center Earth-Moon distance of 238,900 miles).I hope this helps.