Originally posted by Christine Tham Ray, I am not sure how you can tell whether a photo is focused or not by looking at a downsized screen version of it.
Christine, in many or even most cases images look sharper when viewed at a smaller size, so if they look generally soft at the size you posted, It is hard for me to imagine that they are indeed sharp.
Quote: All I can say is that if I pixel peep, the photos are focused exactly where I want them to be. For example, zooming into the spider legs will reveal the tiny "hooks" they have running down their legs. Obviously these are not visible on the downsized version.
I will take your word for it.
Quote: If you like looking at overly sharpened images, then these photos may look soft to you because I have not applied any sharpening at all to the raw captures.
Overly sharpened is a subjective term that means nothing. I do know that applying no sharpening might be a personal choice, but given the nature of the AA filters in most DSLRs, it is generally accepted that some level of sharpening is required. The level is dependent upon the intended use of the image.
No sharpening would result in an overall softness to the image, however.
Quote: As for me making assumptions - if you read my post carefully I made none - I simply raised the possibility and was not directing that possibility at anyone - and definitely not yourself in particular.
Ok, I accept that, and also was not intending any sort of personal attack, but let's break down some of the things that you seem to keep repeating (I am not going to go back and get quotes, so please correct me if I am way off base on my recollections here):
1. A few cm FF isn't a big deal -
You seem to mis-understand the nature of the problem here. First of all, a few cm FF in a macro will almost certainly ruin the shot. Secondly, the FF is proportional to the distance, so a few cm grows to many cms or inches as you move a bit further away given the same conditions. It does not remain a few cm.
2.A few K5s might have this problem - Ok, Falk's findings today notwithstanding, let's talk about just your K5 and my K5 experiences. Let's also just agree that your camera is as perfect as you say, and the 3 that I used are as bad as I say. Between us we have used 4 K5 cameras 75% of which would not focus properly.
Furthermore, and perhaps you are unaware of this information, but many users have posted here about the issue, and many with solid images showing the problem. There are also many reports of the issue on a Spanish forum. There are many reports of this issue on a German forum. There are many reports of this issue on DPReview. There are reports of this problem out of the U.K., and finally a member here who is a dealer of Pentax products (Pentaxeros) reports that he has tested (50?) K5s and that they all behave the same way. He also reports that Pentax has confirmed the issue to him.
So, I think it is clear that the issue is widespread and that it either affects all cameras, or a great many of them, not a few. All would be best in terms of getting a fix, btw.
3. User error - This is where folks start to take umbrage with you continuing to say this in light of fairly over-whelming evidence that there is something wrong with the camera.
It is hardly likely that so many people all over the world are making the same error and only you and a handful of others are not.
There are many experienced Pentax photographers that post here and elsewhere, and many of them have been posting in this or the other forums, or on the old Pentax mailing list for many years. I trust them to know a focus problem when they see it. In my case, I have shot with no less than 11 Pentax DSLRs (counting 3 K5s that I tested and shot extensively with 14 lenses from 3 makers) and I can tell you the following about them:
All 8 Pentax DSLRs I owned before the K5 FF as the light is reduced (many have speculated this is a tunsgten light issue, but that has never been proven).
The earlier models I owned (istds, K100D, K10) pretty much gave up in reasonably low light, but also remained within the DOF (just barely depending on the body and lens combo) until that point.
The 2 K20Ds I own(ed) also FF in the same conditions, but at EV2 or 3 are also still acceptably focused. I suspect that the K20 would not lock much lower than this, but I would have been happy with a K5 that focused this well as it clearly has been good enough for me for several years now.
The K20 has the same AF spec as the K5, btw, EV-1 to EV18, and I am sure that it would not meet spec at the low end. The difference is that the 3 K5s I tried just dropped off a cliff between EV 2-4. The K20 just gradually moves a bit more FF as the light is reduced, and a touch of BF adjustment in higher light will often make for good focus all round. With the K5 it took all of the AF adjust to focus even close at EV3 or 4, and then they would BF in higher light, but still drop OOF at EV1.
Anyway, I think that perhaps Falk's report will finally convince everyone that there is a problem with the camera, which is no surprise to me. Falk's report is good work in putting some more objective data together on the issue, but this issue has been painfully obvious to me from almost the first few shots from my first K5.
Ray