| Author |
Message |
    
Kyoritsu
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, April 27, 2006 - 05:41 pm: | 
|
Is there a specification for the run time difference between the first and second shutter curtains? Also, what exposure variation is acceptable/allowed across the frame?
I find that the run times of the first and shutter curtains are not constant with different shutter speed settings. Hence the exposure difference across the frame can be as high as 0.5 stop. |
Roberto Rossi
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, April 27, 2006 - 07:47 pm: |
|
1/2 stop is the industry norm for most focal plane shutters. There are people who say they will adjust to 1/3 or 1/4 stop, but this is a bit pointless given the latitude of modern emulsions, tolerances in exposure meter calibration and tolerances in processing. |
charlie
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, April 28, 2006 - 07:12 am: |
|
I agree with you that 1/2 stop difference from one side of the frame to the other does not sound good. Try having it repaired if it is a valuable camera. |
Kyoritsu
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, April 28, 2006 - 05:20 pm: |
|
I have heard from several professional repairers that 1/2 stop exposure variation across the frame is 'acceptable'. It sounds rather high to me.
I can achieve better than 1/4 stop variation across the frame for most shutter speeds, but not for the fastest shutter speeds. |
