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02-20-2007, 07:47 AM   #16
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QuoteOriginally posted by benjikan Quote
No can do...The reflected light would change the ambiance of the photo. You know, it's just one of those things I will adapt to until the problem is rectified.
Time for a software change. According to the manual, the K10 uses the P-TTL pre flash to illuminate the subject for auto focusing. Would it be unreasonable to ask pentax to provide a special function to disable the main flash and use the built in pre flash for a focusing aid only?

I don't know if it would be distracting to your subject,

02-20-2007, 09:58 AM   #17
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I agree

QuoteOriginally posted by benjikan Quote
Just one correction. I rarely shoot rapid fire in studio. I generally take at least two seconds between each shot..
Exactly, that is what I meant. Perhaps "rapid fire" was inappropriate since I did not mean continuous/drive mode but exactly what you have described, as opposed to putting camera on a tripod, contemplating the scene, and makeing sure shutter speed, aperture, and focus are all fine (could take a minute or so) before pressing shutter release.

My impression is that for fashion photography (where model usually changes pose and consequently lighting and distance every 2-3 seconds requiring quick reaction) current Pentax AF system is not as reliable as a working professional may demand and I believe you have experienced that. (Since I shoot studio still life stock photography it is not a problem for me.)

My expectation is that DA* lenses may improve AF accuracy required for your style of shooting where you have very limited time to take a shoot.

-= IVAN =-
02-20-2007, 02:38 PM   #18
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Response to a concern..

I was asked at Pentax World if Canon and Nikon are that much better than Pentax in terms of focussing. This was my response...

Pentax is NOT "that much worse than the Nikon and Canon". It is and can often be better but... My demands are quite stringent as I am more often than not shooting under incredibly adverse dark shooting circumstances such as this...Shot with 17-40 L lens. To be quite candid with you, I found that the 16-45 was surprisingly sharp and responsive under similar conditions. However the hit miss ratio of the Pentax was a bit less than that of the Canon. I am quite sure that the problem is temporary and only exists on a small percentage of the K10D's sold. I think it has to do with QC in some cases and some adaptations required for certain lenses, like the 21MM Limited are needed. My 40, 70 and 100 are on the mark. There were several lenses associated with the Canon 20D that had similar problems. Let's remember that it is a new camera and it takes time to collect all of the data and find a broad stroke balanced solution to several issues voiced by Pentax users world wide. As a Beta tester for Pentax, I am able to communicate directly with Pentax and give them my feedback. I cannot however act on behalf of all of the users on this forum. The issues voiced here are often mirrored in my concerns that I have voiced directly to them. I cannot complain about hardware features that do not exist on the present configuration. I can suggest future hardware implementations such as Flash Synchro X input etc. But these are suggestions that can only be implemented in future designs that may or may not be implemented.

Ben
02-20-2007, 11:24 PM   #19
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Low Light Focus IS a problem!

Good to see this thread, I thought it was just me. I have no lens that works in low light, even a 1.7 50mm I have found requires manual focus.

It just hunts and tries to lock, the onboard flash focus assist is not much help, and the 540FGZ is little better. One other brand that I tried in similar conditions was perfect, so I am hoping for a firmware upgrade to sort it.

Thanks Ben, your credibility helps a lot.

02-21-2007, 02:33 AM   #20
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Graphic Representation Mimicking my Lighting

Here is a graphic representation of a typical type of lighting I use on occasion where the problem has cropped up. The Black area represents parts of the image that are very dark with no illumination. The Grey areas are parts of the image illuminated but not part of the main subject. The Green area is the lower portion or bottom of the subject and the Red could represent the face of the subject. This is more than a Graphic representation as it mimics the lighting conditions used during my shoots. As you can see, it challenges the AF sensor to only focus on the Red section. Also remember that I am shooting at the Red section from the floor at a distance of about 3 meters.

Last edited by benjikan; 03-21-2007 at 01:11 PM.
02-21-2007, 05:28 AM   #21
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Benjikan,
I am following your threads with the utmost fascination and can you please tell me if I am following this thread correctly?

I am interpreting that overall you are fairly happy with the K10d as your work tool of choice.

That there is a focussing issue with one of your cameras (or is it both?) that due to your creative lighting techniques and the angle of the shots the AF is off in a certain % of shots (and in particular with the 21mm LTD).

From this I am interpreting that the AF is at least locking and not continually hunting. (am I wrong?)

I am not a K10D owner - still happy with my *istDS, nor a pro of any sort just really interested in how you go about producing such art.
02-21-2007, 07:54 AM   #22
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21mm

QuoteOriginally posted by Falcons Quote
Benjikan,
I am following your threads with the utmost fascination and can you please tell me if I am following this thread correctly?

I am interpreting that overall you are fairly happy with the K10d as your work tool of choice.

That there is a focussing issue with one of your cameras (or is it both?) that due to your creative lighting techniques and the angle of the shots the AF is off in a certain % of shots (and in particular with the 21mm LTD).

From this I am interpreting that the AF is at least locking and not continually hunting. (am I wrong?)

I am not a K10D owner - still happy with my *istDS, nor a pro of any sort just really interested in how you go about producing such art.
When I started the photo shoot, I had tested the 21mm Limited under mundane lighting conditions. Everything seemed fine. When I finished the studio shoot and in checking the images closely during the editing process, I found that the face was less sharp than the feet even though I obviously focussed on the face. I was not parallel to the model but shooting up at her at about 45 degrees. The focus showed that it was locking even after I confirmed this by depressing the shutter half way several times and getting the confirmation audio beep. In viewing the final results at close proximity, this is where the issue became glaring. We are in the process of finding a solution to this problem and once Pentax contact me with their solution, I will share it with you. As I am Beta testing so to speak, my solution may come earlier as a result of a specialised case specific problem. I am quite sure that the issues address here and elsewhere will be given the utmost attention at Pentax.

Yes I am very pleased with the K10D and consider this just a small glitch in their growing process...

Last edited by benjikan; 02-21-2007 at 08:01 AM.
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