 Charley Andrisano |
Using remote for a time exposure To whom it may concern: I shot some time exposures recently, and set my aperature at f.22. These were night shots. Every shot had a 30 sec. time lapse. But I noticed that even though I had set the aperature at f.22, 30 seconds kept blinking in the viewfinder. The shots are exposed beautifully. In viewing the pictures in my software none of the aperature readings are showing f.22. I see f.9, f.10, and f.13. I never changed the f.stop readings. They were set at f.22 for all the shots. Can you help me here. Charley Andrisano.
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Jon Close |
What camera, lens, and exposure mode did you use?
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Charley Andrisano |
I used a Canon 20-D Digital, with a Tamron 19-35MM lens f.1:3.5-4.5, set at 19MM.
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Jon Close |
And the exposure mode?
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Charley Andrisano |
As I said Jon, the exposure was set to aperature priority. f.22. With the light so far away, the exposure took 30 seconds. The ISO was 100. I just pressed the remote, and 30 secs later I had a picture. Hope this helps. Charley P.S. Every exposure was right on. But as I stated previously, in my Canon software not one of the shots was recorded at f.22
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Jon Close |
No you didn't say aperture priority, but that's ok. ;-) Check C.Fn 16 - Safety Shift. I'll bet you've selected it (=1). P. 145 of the manual. 30 seconds was blinking because the meter read underexposure at f/22 and 30". With Safety Shift on in this situation, the camera overrides your aperture setting to give what it thinks will be proper exposure. So you got f/9, 10, 13 and 30" instead.
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Charley Andrisano |
All good things eventually come to a workable end Jon. I completely forgot about the Safety Shift. I did set it at 1. Thank you for all your help. Do you recommend keeping it there? Charley.
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Jon Close |
Hooray! I don't have a recommendation on that. Camera meters, even the very good multisegment Evaluative/Matrix ones, are not perfect and you may want an effect that calls for more or less exposure than what the meter would calculate. In your situation, Safety Shift gave you good exposures without any more input from you. Great when one is working fast, but you may still want the shot at f/22. With Safety Shift turned off, the 30" would blink and the meter scale would have indicated -1 or -2 instead of "0". Then you would have known to switch to M and set the shutter for Bulb to get a good exposure at f/22.
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