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Forum: Pentax SLR Lens Discussion
01-27-2013, 10:58 AM
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Depending on the lens value, it may be or may not be worth the repair cost. Anyway, it is one of the more complicated repairs, because it involves almost complete disassembly. I cannot give you a price estimate, because I have greased my own lenses. Others may be able to tell you how much Eric Hendrickson charges, though.
Dampening is also influenced by the tolerances in the threads. By this, I mean that an A lens will always feel sloppier than a Takumar, and will require more grease to fill in the spaces between threads.
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Forum: Photographic Technique
01-25-2013, 12:43 PM
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More victims of the equivalency brigade I see. Na Horuk has it basically correct. The image is just cropped compared to a full-frame -- that's it. However, that means you'll be likely enlarging it more for display than you would if you were using that same lens on a full-frame, and so the crop sensor is "stressing" the lens more if you will. So it makes sense to fudge the scale over so that the boundaries of "acceptable sharpness" are more stringent when using a crop sensor. So when using the same lens with the same aperture, the crop sensor does essentially give you THINNER DoF than a full-frame. It is only when we get into "equivalent" lenses (which means different focal length lenses) on different format bodies that the larger format allows thinner DoF.
But anyway, the DoF scales printed on old lenses are assuming full-frame, and you will find it wise to use a tighter boundary with your crop sensor by fudging it by a stop or so...
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Forum: Pentax K-5 & K-5 II
05-03-2011, 05:33 AM
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I'm really not sure I get what you're saying here, something lost in translation, sorry... Anyone else?
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Forum: Pentax K-30 & K-50
01-05-2013, 02:47 PM
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Hi, I have just begun shooting with a DSLR and got a super tak 1:1.8 55mm lens which has totally changed the way I take pictures!
I was just wondering if people had any good tips for shooting with an older lens regarding things such as focusing, bracketing.. and any other general information it would be much appreciated and could develop into a useful resource for future beginners such as myself
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Forum: Pentax SLR Lens Discussion
07-17-2012, 07:15 PM
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Argh! I was in the mix for an A20mm f2.8 on E-bay just a moment ago. It ended up going for $512, which was more than I could afford.
Please, Lens God, bestow a wide angle prime in the 18-20mm range upon us for under $300.
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