p.1 #1 · Help with odd problem 5D exposure/shutter
Hi All,
I recently sold my back up 5D to a great guy here on FM. It was a very lightly used cam, mostly as a back up for Bar Mitzvah shooting in the dark (high ISO, low SS, bounce flash). Upon 'testing' it out, my buyer found the pattern you see in the image below. Shooting a wall, with increasing shutter speed (but NOT constant aperture) he sees this darkening. Now, I thought it might be vignetting - higher SS, lenses wide open, but it looks really kind of severe.I don't have the exif data on the individual images. I guess I should take a look.
It just looks way odd to me to be a focal plane shutter problem. Anyone ever see this before? Whatever it is, if it's broke I have to fix it.... Can you suggest something to try to aid in this diagnostic??
p.1 #4 · Help with odd problem 5D exposure/shutter
I would have suggested that it might be a problem with the lens not stopping down fast enough, but that's very unlikely as it was the same with two different L-series lenses.
p.1 #5 · Help with odd problem 5D exposure/shutter
Do you have the CF enabled that automatically corrects the aperture or SS if you've set it beyond what will achieve a correct exposure? i.e. has the exposure darkened because the increase in SS has not been successfully countered by ISO or aperture?
What is the light source (is it constant)? Even in the slower SS ones there is not completely uniform lighting. The severe asymmetry at 1/6400 and 1/8000 really is odd though, which lens was used for the ones posted, or is this asymmetry the same on each tested lens?
p.1 #7 · Help with odd problem 5D exposure/shutter
Ive recently ran into this issue as well, with my 5D, I dont seem to have the issue at slower shutter speeds, I started a thread about mine, sorry I cant give you any helpful info on it, as ive yet to look into the issue https://www.fredmiranda.com/forum/topic/830859/0#7720711
p.1 #8 · Help with odd problem 5D exposure/shutter
elader wrote:
you all don't think this is a fluorescent light issue, do you?
Hard to say since I've never had enough light to shoot at 1/1600 and up under fluorescent light Maybe ask the buyer to try again using tungsten light source or daylight if the original test was done under fluorescent?
p.1 #10 · Help with odd problem 5D exposure/shutter
At least according to finnish law, if a private person sells something to another private person the seller isn't responsible if the goods break after one usage time or during shipping. Dunno how it is in the US.
p.1 #11 · Help with odd problem 5D exposure/shutter
MaxiKana wrote:
At least according to finnish law, if a private person sells something to another private person the seller isn't responsible if the goods break after one usage time or during shipping. Dunno how it is in the US.
Well... it's not exactly broke if you shoot under 1/2000th of a second
Seriously, if I sell something and in good faith represent it as working according to specifications and it turns out with someone who tests more thoroughly than me that there is something wrong, I feel that I have to make it right. Now if the issue was 'my lens back-focuses on your camera' or something like that... well...
I am a firm believer in not screwing my fellow photographers. FM buy-and-sell is a sacred trust.
Maybe ask the buyer to try again using tungsten light source or daylight if the original test was done under fluorescent?