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01-26-2011, 03:40 AM   #301
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QuoteOriginally posted by Cannikin Quote
No FF.
What was the colour temperature of the light/subject? It appears it needs to be on the warm side for the FF issue to occur.

01-26-2011, 03:42 AM   #302
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QuoteOriginally posted by Wheatfield Quote
At the moment, the rep that handles my area is on vacation, but I will be talking to him when he is back in the office to see what, if anything, they feel they can do about both the front focusing...
Once he found the solution, could he be so kind and tell the engineers in Japan about it?
01-26-2011, 05:29 AM   #303
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QuoteOriginally posted by Tommot1965 Quote
turn the AF assit lamp off when in that situation..turn it back on when your not..
Hmm, I really don't think that's a feasible solution. Fumbling with the camera every time you change vantage points or subject distance. Certainly wouldn't suit my shooting style.

I think we need a real solution.
01-26-2011, 05:32 AM   #304
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QuoteOriginally posted by areidjr Quote
Hmm, I really don't think that's a feasible solution. Fumbling with the camera every time you change vantage points or subject distance. Certainly wouldn't suit my shooting style.

I think we need a real solution.
agreed

01-26-2011, 05:34 AM   #305
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QuoteOriginally posted by Wheatfield Quote
At the moment, the rep that handles my area is on vacation, but I will be talking to him when he is back in the office to see what, if anything, they feel they can do about both the front focusing, and what is for me going to be a more pressing problem, which is the rather brutal amount of mirror slap that my K5 has.
Mirror slap and moderate FF was the reason for my first exchange and severe FF and sensor stain on the second. I hope to have the third in my hands by the end of next week.
01-26-2011, 06:58 AM - 1 Like   #306
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I hope Pentax doesn't fudge with AF-assist light.

I use low light available light photgraphy for candid shots and the green light spoils it....lowering the AF-assist light's threshold would solve the issue in many instances but as the K-7 and the 645D didn't need this, it can only be characterized as fudging a camera to sort of work...this would be very uncharacterestic of Pentax....I know every camera brand has issues but if Pentax cheats to fix this then it's a clear indication to me on what direction Hoya is heading and it's not a path I'll be willing to take.
01-26-2011, 07:11 AM   #307
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QuoteOriginally posted by pcarfan Quote
I use low light available light photgraphy for candid shots and the green light spoils it....lowering the AF-assist light's threshold would solve the issue in many instances but as the K-7 and the 645D didn't need this, it can only be characterized as fudging a camera to sort of work...this would be very uncharacterestic of Pentax....I know every camera brand has issues but if Pentax cheats to fix this then it's a clear indication to me on what direction Hoya is heading and it's not a path I'll be willing to take.

While I am pretty sure the Assist Lamp being available on command would work for me, I can see that it too presents problems for many others. If this is the only solution offered, then I also agree that there will remain a large number of very unhappy users. If I had the K5 then having the Assist Lamp option would work for me, but I don't have one yet. Would I buy one if this was the only option for FF problems. No, absolutely not. For the same reason I will never buy another Pentax SDM lens, although I love my DA*50-135, which is a replacement for my original one. I suspect it has the same problems as the first one, and to date Pentax has never made it "Screw Drive" ready in case it fails at SDM.

The proper course is a solution to FF, and anything short will label the K5 as another SDM Adventure.
Regards
01-26-2011, 01:45 PM   #308
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QuoteOriginally posted by pcarfan Quote
...lowering the AF-assist light's threshold would solve the issue in many instances but as the K-7 didn't need this, it can only be .
not so sure about that, I don't have my K7 to test back to back, but it feels to me the AF assist light came on way before the K5's does ....as I say ive not tested it, but it was something I noticed straight away when I got the K5

01-26-2011, 04:47 PM   #309
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I can hardly call the assist light a solution. It is a workaround at some occasions. Nothing else.
The fact that some new Pentax K5 cameras really do seem to have a good AF tells me they do not have a clue where to look for. Maybe some batches of the AF sensors were/are faulty without them actually having the option to check this properly, yet keeping the production lines up and running.
01-27-2011, 04:12 AM   #310
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QuoteOriginally posted by Tommot1965 Quote
not so sure about that, I don't have my K7 to test back to back, but it feels to me the AF assist light came on way before the K5's does ....as I say ive not tested it, but it was something I noticed straight away when I got the K5
I didn't exactly test when the K-7 AF light came on and how it compared to the K-5. But, my K-7 without the AF-assist light (disabled) could focus at least 2-3EV's below than what the K-5 could (for low light photgraphy that right there negated any 2-3 high iso advantage the K-5 had over the K-7 )
01-27-2011, 04:58 AM   #311
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QuoteOriginally posted by pcarfan Quote
I didn't exactly test when the K-7 AF light came on and how it compared to the K-5. But, my K-7 without the AF-assist light (disabled) could focus at least 2-3EV's below than what the K-5 could (for low light photgraphy that right there negated any 2-3 high iso advantage the K-5 had over the K-7 )

fair call...shits yer dont it........Im sure those little white coated Boffins will sort out the K5....if the K7 can do it..then so can the Mighty K5..LMAO
01-28-2011, 10:58 AM   #312
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Hi guys,

I don't know if someone tried it, but here's my correspondence with one of the chat support specialists at Pentax USA:

----------------------
You have been connected to Michael C.
Michael C: Thank you for contacting Pentax chat support George, how may I help you?
George Simeonov: Hello Michael
George Simeonov: I just wanted to ask you something, that many K-5 users all over the world have been worrying about
George Simeonov: it's about the front-focus issues under dim tungsten light
George Simeonov: do you have any knowledge on this matter?
Michael C: I do not have any official information on any front or back focusing issue
George Simeonov: yes... I know it's not official yet
George Simeonov: I was hoping you had some information on a new firmware or something...
Michael C: I'm sorry, i do not have any information on any kind of firmware to address that
George Simeonov: because it's a real issue
George Simeonov: well... ok, thank you... I hope you have some ways of reporting this to Pentax?
George Simeonov: If it's not reported already.
Michael C: it is, and thank you for letting us know and your concern
Michael C: as soon as we have some information, it will be posted for all consumers
George Simeonov: Great
George Simeonov: Thank you, Michael, and have a nice day
Michael C: You're welcome George
Michael C: Thank you for contacting Pentax chat support George, have a great day!

---------------------

I guess it's silence from Pentax USA. Either they know something, but it's now official yet, or they only have reports with no actual results...
01-28-2011, 11:34 AM   #313
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QuoteOriginally posted by Class A Quote
What was the colour temperature of the light/subject? It appears it needs to be on the warm side for the FF issue to occur.
I don't have exact color temperature numbers (not sure how to obtain them), but the light source was fluorescent and noticeably "warmer" (yellower) to my eyes than the "warm white" CFL I have on my desk lamp.

Last edited by Cannikin; 01-28-2011 at 11:45 AM.
02-03-2011, 03:34 PM   #314
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I was at one point wondering if the problem was related to the infrared contribution. I know from doing IR photography that IR needs close focus than visible light. So I did a test with my tungsten light on a dimmer and used a IR-cut filter. Interestingly, it did not focus better. Not sure if it was because of the IR I filtered out which made it much dimmer for the camera sensor. I need to look into that more when I have more time. One thing is certain that the camera's focusing behaved differently with the IR-cut filter on it in don light conditions.
02-04-2011, 06:51 AM   #315
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IR having an effect here would fit: tungsten light has plenty of that and I understand that focusing for IR would mean front focusing for the shorter (visible) vavelengths (?). If this is the case a firmware fix might not cut it assuming the AF sensor is a simple stripe of wideband detectors as opposed to maybe multiple parallel stripes with different filters on them (?).
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