Pentax K5 AF

[jonoslack]

A German physicist/photographer Falk Lumo has done some extensive analysis on the K-5 AF issue:

http://www.falklumo.com/lumolabs/articles/k5focus/index.html

Thanks for the link
excellent and thorough work. However it doesn't really impact on Tom's problem, which is poor focus in good light (not an issue I've seen).

 

[Sapphie]

Lee,
I wondered about the SR too, but havent tried without yet.
I also wondered if the smaller size and weight of the K5 an lenses compared to a D700 (thats my reference of focus accurancy) might be more prone to shake.
Some images which are only slightly soft its hard to seperate if it is inaccurate focus, shake, noise reduction/ noise, soft lens or something else.

Tom

My thinking was that if it isn't SR per se that is causing blur it could be my technique. I tend to focus with central AF, keep shutter half way down - by which time SR has 'stabilized' (what does that actually mean) and I recompose, dither a bit trying to watch the view for being steady (an old habit I can't break), which still has the shutter half pressed and then shoot.

I am going to disengage AF from the shutter release and do the focusing via the AF button on the back. Then I'll just trip the shutter quite quickly when I am ready, just after SR comes on. I will also try it without SR.

It may be nothing to do with this of course!

Lee

 

[MichaelinA2]

A German physicist/photographer Falk Lumo has done some extensive analysis on the K-5 AF issue:

http://www.falklumo.com/lumolabs/articles/k5focus/index.html

Keep in mind, this study utilized only one unit, his own. As it has yet to be replicated on a random sampling of representative units, generalizing his results to all K-5s seems premature, don't you think?

Cheers... M

 

[Paratom]

Tom

My thinking was that if it isn't SR per se that is causing blur it could be my technique. I tend to focus with central AF, keep shutter half way down - by which time SR has 'stabilized' (what does that actually mean) and I recompose, dither a bit trying to watch the view for being steady (an old habit I can't break), which still has the shutter half pressed and then shoot.

I am going to disengage AF from the shutter release and do the focusing via the AF button on the back. Then I'll just trip the shutter quite quickly when I am ready, just after SR comes on. I will also try it without SR.

It may be nothing to do with this of course!

Lee

My technique is most of the times to actiate focus with the focus buttom in the back, having focus on afc, focus and the press the shutter button.

I would need to check my lenses since I got a new body and eventually do fine adjust.
I also have shot more with the S2 lately so it might also be the case that I am used to so sharp images that the K5 ones look not sharp to me any more.
I first need to find out whats going on since now I am speculating a lot.
The problem is time.