Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: Will it work with k-II series? And which is more versatile the 50mm or 35mm for landscape and travelling? So also i should buy lens cap for this? :S
Document: Amazon got me a pricematch and worked with me to make up for a bad seller. Took some work but in the end saved me $$. The lens is amaz(on)ing. Super fast focus, super sharp from 2.4. I'd say it's as sharp if not better(bokeh at 2.4), than my 40mm limited. Also no screw on cap and hood to deal with but it doesn't have a hood to begin with.
f/22 suffers a bit, but is still acceptable. It's *incredibly* sharp from f/3.5 through f/5.6... nearly to the point where it's TOO sharp. (Did I just say that?) The color rendering is surprisingly similar to the old SuperTak: Beautiful. This lens also handles sun flare very well. All of these factors have made this little 35mm my favorite lens and I use it for work 80% of the time.
I was disappointed. Same quality images as a small mass marketed zoom. Thought I was getting a partner for my Fast fifty f1.4 50mm FA. Not even close. But if you are looking for inexpensive 35mm prime for general use and not overly fussy, this can work.
I mainly bought this lens to take picture of my kids. I have a pentax k-x with two kit lens DA 18-55 and 50-200. The performance of DA 18-55 is not that good and many times I felt the need of bigger aperture. It is fast, accurate at focusing and sharp.I was also considering 50mm f1.4. I think that 50mm is too long for indoor photography specially for kids and also the price of this one is much lower.
Sure, the Pentax 31 f/1.8 is better performing, and the f/2.4 speed of this lens is not terribly fast. This lens is also all-plastic construction. Why buy it?Buy this lens because it gives you 85% of the performance for 10% of the price. Although all plastic construction, it feels tough, sturdy, and light.
This is an excellent lens for the price. Great IQ! Good focal length to use and work with effectively 50mm, which is what the eye sees.
Love it. It was my default lens on my last trip. It behave more like a 50mm on APS-C, but still an amazing buy.
I was hesitant to buy this lens despite the good reviews as I tend to use my 50mm f1.4 for most of my portraits that I shoot. I decided to try this camera at an outdoor photo shoot, and I am really amazed at the results. The color was good, and it was extremely sharp on f3 with a good depth of field. It isn't as fast as my 50mm, but it is definitely a nice addition to my portrait lenses.
Pros:CostOptical PerformanceCons:Plastic buildNo included hood or bagSmaller aperture vs competition for same priceBottom Line:Buy one.The Pentax 35mm is a great lens that complements any standard zoom. The aperture is large enough to be advantageous. It offers at least a half stop over an f/2.8 zoom, and in reality probably closer to an f/stop given the fewer lens elements. The lens is bright at f/2.4, where most zoom lenses lose significant contrast wide open.
If it finally shows wear after 4000 mounts you'll have to just remind yourself how long this inexpensive lens lasted.This lens is NOT a 50mm replacement. It might have a 52mm Field of View on the crop body but it is NOT a 52mm lens. Make no mistake: This is a 35mm lens and *IS* a wide angle. Lens makers are very careful to state FOV to give you an idea of the view, but they state nothing about expansion or compression.
Answer: You should really get both at this price , but I would get the 35 first because you can always corp the image, not to mention that the 35 has a neutral kind of feel to it.