Originally posted by jstevewhite Honestly, I'd really like to see a K20D shot at ISO 1600, f8, 180th with the same subject size that is "sharper".
OK, you got me there. Although I do have some clear and sharp K20D shots at ISO 800 and 400, that's as far as it goes. However, your comment did wake me up.
I just spent literally hours reviewing my photos, in an attempt to narrow down the things that displease me. One thing that became obvious is that I've "forgotten" that I was quite careful with my ISO settings with my K20D (now gone), rarely exceeding 400. With the K-5, I've gotten carried away, and started shooting a fair bit at 1600 & 3200, forgetting that "better" does not mean "excellent". This is a point you made earlier (post #7) "it's a matter of usable images, not the best possible images". The fact is that none of my K5 shots at ISO 400 or less are horrible (at least within the context of this thread
). Fine, this use of high ISO explains quite a few of my bad images.
Originally posted by jstevewhite Now, this is not the same as saying you're not having focus issues; I just don't think this is necessarily one. This is a pretty sharp image for the circumstances.
I have one zoom lens from Sigma that is similar to what you describe; that is, if I set the autofocus fine adjust at the wide end (18mm), it's off at the 50mm end, and vice versa. The solution everyone has given me is "Send the camera and lens together for calibration", but since it's just the one lens, I don't really wanna mess with it - all my others work properly, including two other Sigma zooms and all my Pentax glass. The 18-50 still works properly on my K20d, though. Odd.
Rather than bore you with more images, let me state with full confidence that I have consecutive shots, taken seconds apart, where #1 & 3 are reasonably focused, and #2 is $hit. I have this problem with more than one lens. I certainly had some badly focused shots with my K20D, but there was more overall consistency.
So, I am satisfied that I've found explanations for a good percentage of my fuzzy images. What remains is the inconsistency in the optimal AF Adjustment across the zoom range. Aside from the possibility (wishful thinking here) that FW 1.10 resolves some of these issues, does one blame the camera, or the lenses? If it's the lenses, is this a fixable problem? Would Tamron or Pentax consider this to be a problem that they should repair?
I sincerely appreciate your having taken the time to add your comments. Thanks.