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02-18-2011, 05:12 AM   #16
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QuoteOriginally posted by Adam Quote
It would be helpful if EXIF info wasn't stripped from the photos!
Hmmm, PhotoMe shows all EXIF info for the pics I've uploaded, so I suppose it was lost during the upload process? How do I upload and retain EXIF data?

02-18-2011, 06:06 AM   #17
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Ehkä yli valottuneita.
02-18-2011, 10:27 PM   #18
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QuoteOriginally posted by 30v iPentax Quote
Ehkä yli valottuneita.
That issue I will tackle in a future What is this %$&#?* (No. 2)?, unless I manage to find some answers in existing threads).
Edit: I've seen several threads with references to flash overexposure, and also the statement blurred images when using PTTL flash at 1/125 to 1/160second, which sounds like something I have too, though I haven't actually narrowed it down to a specific shutter speed range. I have suspected that some of the horrible results I've obtained are due to poor flash performance, compounding the FF issue.

Last edited by bxf; 02-21-2011 at 02:02 PM. Reason: New info found
02-19-2011, 02:12 AM   #19
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Se on ehkä Google huono kielen ymmärrys.

02-19-2011, 02:33 AM   #20
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After reading the issues, the responses, and your reply, I would recommend a good photography book. Something that covers exposure, composition, lighting, focal length, etc. Pentax / Canon / Nikon, it won't help you with those type of issues.
02-19-2011, 07:46 AM   #21
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Just curious have you tried additional shots with similar lighting and are they in or out of focus?
02-19-2011, 12:20 PM   #22
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QuoteOriginally posted by bxf Quote
...it sounds like it could be the artificial light FF problem after all. I was under the impression that the FF error was in the range of a few centimeters, but evidently that is not the case. I must agree with those who take a strong stance on this issue, as it presents severe limitations.

.
Nope it's not the case from ....

https://www.pentaxforums.com/forums/1382765-post59.html

Here's two images taken by myself ( not something I've randomly lifted of the Net ) of the same number plate with my K-5 with attached Sigma 30mm/1.4

1/160 f/1.6 ISO6400 - both 100% crops. no PP - subject distance about 20 to 25 feet

Auto Focussing using Live view


Auto Focussing using regular focus




btw - that number plate wasn't even dim light, it was lit by the headlights of my car. K-5's regular AF failed. Live view focus nailed it.


And of course the K-5 can take low light photos. I've taken hundreds of them already.
02-20-2011, 03:20 PM   #23
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It seems the guys on this forum are probably too polite to comment, but I'll say it ...

the girl in those photos look totally hawt!!! great body and legs!

My thoughts on the photos - the glitter in her skirt and her hair strands seem focused to me ... (hard to tell though due to the reduced resolution)

are you sure you are not taking those photos with your lenses wide open? generally lenses look a bit soft when they are not stopped down a bit.

I probably would have used f4 or even f5.6 for those photos.

02-21-2011, 01:18 PM   #24
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QuoteOriginally posted by smc Quote
After reading the issues, the responses, and your reply, I would recommend a good photography book. Something that covers exposure, composition, lighting, focal length, etc. Pentax / Canon / Nikon, it won't help you with those type of issues.
Sounds good. Now, if you could only direct me to a publication that discusses K5 low-light focusing problems in detail, that would be most helpful.
02-21-2011, 01:40 PM   #25
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QuoteOriginally posted by mgm2 Quote
Just curious have you tried additional shots with similar lighting and are they in or out of focus?
Yes, and yes. I'm taking my time replying to these posts because I'm away on holiday, with limited internet time and limited time to perform meaningful experiments with the K5. But, although most of what I've been doing is taking snapshots, many are in relatively low light, with out of focus results. Daylight shots are definitely better, confirming the suspicion that this is "simply" the K5 low light problem.
02-21-2011, 02:10 PM   #26
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QuoteOriginally posted by Smeggypants Quote
Nope it's not the case from ....

https://www.pentaxforums.com/forums/1382765-post59.html

Here's two images taken by myself ( not something I've randomly lifted of the Net ) of the same number plate with my K-5 with attached Sigma 30mm/1.4

1/160 f/1.6 ISO6400 - both 100% crops. no PP - subject distance about 20 to 25 feet

Auto Focussing using Live view


Auto Focussing using regular focus




btw - that number plate wasn't even dim light, it was lit by the headlights of my car. K-5's regular AF failed. Live view focus nailed it.


And of course the K-5 can take low light photos. I've taken hundreds of them already.
I'm encountering problems similar to what you've shown. As you point out, it appears that the focusing problems are not restricted to very low light.

Unfortunately, I'm having problems with live view, where sometimes it simply will not focus (neither phase nor contrast). I must chase that one down separately.

By the way, do you happen to know the effective range of the AF Assist beam? It seems that my K5 will not focus when pointed to some dim areas, even though the beam comes on, and is visible on the target area (though faintly).
02-21-2011, 02:16 PM   #27
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QuoteOriginally posted by Christine Tham Quote
It seems the guys on this forum are probably too polite to comment, but I'll say it ...

the girl in those photos look totally hawt!!! great body and legs!

My thoughts on the photos - the glitter in her skirt and her hair strands seem focused to me ... (hard to tell though due to the reduced resolution)

are you sure you are not taking those photos with your lenses wide open? generally lenses look a bit soft when they are not stopped down a bit.

I probably would have used f4 or even f5.6 for those photos.
Ha, you should see her when she's in focus Thanks for the comment.

I don't think I agree about the glitter and hair being in focus. I have other shots where they are, and the difference is clear.

Some of the shots were taken wide open (why is there no EXIF for these things? It is present on the pics I uploaded), but I have several taken a stop down, and they are still OOF, though in some cases less severely, probably due to greater DOF.
02-21-2011, 02:19 PM   #28
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QuoteOriginally posted by Smeggypants Quote
Nope it's not the case from ....

https://www.pentaxforums.com/forums/1382765-post59.html

Here's two images taken by myself ( not something I've randomly lifted of the Net ) of the same number plate with my K-5 with attached Sigma 30mm/1.4

1/160 f/1.6 ISO6400 - both 100% crops. no PP - subject distance about 20 to 25 feet

Auto Focussing using Live view


Auto Focussing using regular focus




btw - that number plate wasn't even dim light, it was lit by the headlights of my car. K-5's regular AF failed. Live view focus nailed it.


And of course the K-5 can take low light photos. I've taken hundreds of them already.
You do realize that your example is ~EV2, which would be considered low light by pretty much anyone.
02-21-2011, 05:12 PM   #29
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QuoteOriginally posted by bxf Quote
I don't think I agree about the glitter and hair being in focus. I have other shots where they are, and the difference is clear.

Some of the shots were taken wide open (why is there no EXIF for these things? It is present on the pics I uploaded), but I have several taken a stop down, and they are still OOF, though in some cases less severely, probably due to greater DOF.
I understand that you would have taken several shots, and some came out better than others.

It's just that I'm not necessarily seeing FF in those photos, just blurriness which could be due to a number of factors.

My experience is that taking flash photos with the lens wide open may cause results like your examples, regardless of whether the camera has good focus or not.

Not saying that your camera doesn't have the issue, just saying it's hard to tell because there may be other factors.

In a situation like that, I would be tempted to not use the flash, and take a photo at f5.6 and use high ISO. I would be tempted to process it as B&W - she would look absolutely ravishing rendered in B&W I think. Just a suggestion.
02-23-2011, 10:44 AM   #30
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QuoteOriginally posted by Christine Tham Quote
I understand that you would have taken several shots, and some came out better than others.

It's just that I'm not necessarily seeing FF in those photos, just blurriness which could be due to a number of factors.
Hence the title of my post - I really did/do not know what is going on. Some of my shots look so strange that I've been reluctant to assume it was just a focusing error issue. For example, I have two shots, taken 9 seconds apart, of virtually the same subject, using the builtin flash, and with a difference of probably several stops in the flash output. I'm also having difficulty pinning down the behaviour of the AF Assist beam, which seems to behave inconsistently.

Having said that, I can't do any meaningful tests or adjustments until I get back home from holiday early next month, at which time I expect I'll be raising some issues with more specific and accurate info.

Thanks for your input.
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