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Forum: Monthly Photo Contests
07-02-2015, 06:38 AM
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Striking, and a different take on "converging lines"
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Forum: Pentax SLR Lens Discussion
06-22-2012, 10:17 AM
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Thanks for the reply. Found the first one post you listed but not the others. Looks like the focus thing is a "feature" then, although why the aperture should make any difference I'm not sure as I assumed (and the one post seems to confirm) that the camera focuses "wide open."
TBH it's not really a big problem as at 10 mm F7.1 gives a DOF from a couple of feet to infinity in any case.
I really just wanted to know that it wasn't just my example.
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Forum: Pentax SLR Lens Discussion
06-22-2012, 08:59 AM
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Just had this lens delivered today. First impressions are good, but there seems to be a problem with autofocus with my two month old K-5 body.
At the wide end of the zoom, 10 mm and up to about 13 mm in single mode autofocus moved the focus ring to "infinity" at subjects over about a meter, but wouldn't "beep" and lock reliably. Smaller aperture seemed to make this worse. Continuous or manual mode work OK. Live view focus works OK. Above that length it seems to work perfectly.
I had a look at the "fine tune" setting for the lens, and after some fiddling a setting of +9 seems to have resolved the problem.
I haven't really thoroughly tested the lens for sharpness. Initial results looked OK at 100% with fall off to edges / corners as expected, so do (to be honest) the "fine tuned" ones.
All thoughts on this gratefully received.
ETA Just got round to testing sharpness properly, and (of course) lens was now focusing in the wrong place!
Put that back to "0" now OK.
Strange thing is now focusing seems better. Could it be this lens doesn't like smaller apertures and dull subjects? Anyway, at the moment it's looking like that bloke Dave was the main problem. . . :)
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Forum: Pentax DSLR Discussion
12-27-2008, 07:21 AM
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I've got this problem on my K20D too. Manufacture was March 2008 so it looks as if there is a problem with a large range of manufacturing dates. I'm up to around 3000 shots at the moment, and I first noticed this at around 2000 shots in October.
Few things looking back through my files:
It appears to be completely random. Like others I thought it was temperature, card, battery, etc. All these may contribute to the problem, but I don't think that they are the main cause.
On my camera it appears to be very rare that the whole image is affected. Most examples the banding is in the shadow only, and more noticeable when you try to pull detail out. Also, and as noted by others nearly all the examples I can find are either high contrast or underexposed.
Spoke to the dealer I bought it from this morning here in the UK. Very pleasant people, but no tech support there today. Will phone again Monday, but the opinion was that they would send it back to Pentax for examination.
My thinking on this is that because Pentax won't accept there is a problem, then with all due respect to the dealer, am I going to start this the "Send it back / weeks of waiting / no problem found / send it back" cycle which means not having the camera for weeks, if not months?
Being as the relatively few images affected are mostly unusable for my purposes anyway due to underexposure etc, am I better off being more careful with my exposure (and yes I know I should be anyway! :)) thus hopefully not getting the problem to any great degree, and not having the hassle of sending it back?
I think that this problem is probably a lot more widespread than has been reported. Unless you actually look at the images quite critically at 100% it's not really apparent, so many users may not have noticed anything at all.
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