All Forum Comments
Comment by stevejcoe posted on CCD vs CMOS at 05/10/2013 - 13:22
A little sunshine between the clouds, ISO was set at 100. Colour balance was set at AWB. Metering by Pattern.
The images were imported into CS6 by ACR, no adjustments were made. Colour balance left as shot.
Images were resized to 900 pixels wide in CS6 (resampled, bicubic sharper) and saved at highest quality JPGs.
[IMG]http://i198.photobucket.com/albums/aa184/stevejcoe/Equipment/CMOS%20vesus%20CCD/IMGP2541a.jpg[/IMG]
[IMG]http://i198.photobucket.com/albums/aa184/stevejcoe/Equipment/CMOS%20vesus%20CCD/_IGP9329a.jpg[/IMG]
Link to full size JPGs
http://s198.photobucket.com/user/stevejcoe/library/Equipment/CMOS%20vesus%20CCD
Regards - Steve
Comment by stevejcoe posted on CCD vs CMOS at 05/10/2013 - 11:08
Regards Steve
Comment by stevejcoe posted on Develop film to RAW? at 27/09/2013 - 19:02
Regards - Steve
Comment by stevejcoe posted on New firmware may be inbound??? at 11/09/2013 - 18:06
Comment by stevejcoe posted on Pentax lens repairs at 09/09/2013 - 09:49
Don't understand what you mean by that
Regards Steve
Comment by stevejcoe posted on K10D Focus Adjustment at 16/08/2013 - 21:36
Adobe do provide software that allows creation of profiles, but it is quite time consuming with zoom lenses.
Regards Steve
Comment by stevejcoe posted on LR5 Lens correction for Sigma 8-16mm at 16/08/2013 - 13:39
thanks Steve that's good to know, I'll probably still try both types of light but if I can't get a consistant reading under tungsten I'll know why!
don't suppose you'd be interested in outlining your tightly controlled and robust process to save us re-inventing the wheel?
Use a tripod
Delayed shutter release, us remote.
Use the lens wide open.
Take a least 5 shots manually turning the focusing ring to different positions between shots.
For a zoom lens repeat at different focal lengths. Some lenses FF at one end and BF at the other.
View the results on your PC screen. Decide whether the lens is front , or back focusing and a
djust accordingly. I usually make a large adjustment repeat the excercise several times progressively making fine adjustments until I am happy with the results.
Alternatively, if you have a macro slide rail there is an alternative method that if I remember Algernon has described.
Finally don't forget to take some real world pictures, before deciding on your final setting.
Regard Steve
Comment by stevejcoe posted on K10D Focus Adjustment at 15/08/2013 - 14:55
I don't know if it's an artifact of the fact that I'm more likely to be at wide aperture, but the issue seems worse on my K10D in poor tungsten lighting.
I think it might be of value to do the experiment under poor lighting as well, and if the results are significantly different then keep a note of both values.
Certainly I'll be testing with my 50mm 1.4 wide open anyway.
From memory, in good natural light my zoom lenses nearly all back focussed, but the FA 50, FA 35 and F31 all front focussed. Since the zooms had smaller maximum apertures, I settled on a compromise setting for the three primes above, but that it what it was a compromise. The FA 50 only really came to life on the K5.
Regards - Steve
Comment by stevejcoe posted on K10D Focus Adjustment at 15/08/2013 - 12:52
If that's the one, then I might have a go tonight, then I can test it when we are away next week.
Regards - Steve
Comment by stevejcoe posted on K10D Focus Adjustment at 15/08/2013 - 11:55


[IMG]http://i198.photobucket.com/albums/aa184/stevejcoe/Equipment/CMOS%20vesus%20CCD/_IGP2558a.jpg[/IMG]
ACR imported with a colour temp of 5500 and tint of +9
[IMG]http://i198.photobucket.com/albums/aa184/stevejcoe/Equipment/CMOS%20vesus%20CCD/_IGP9329a.jpg[/IMG]
ACR imported with a colour temp of 5050 and a tint of -3
Regards - Steve