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Camera wouldnt fire!


I trecked to a bleak headland this afternoon where the Bristol Channel comes against the western edge of the Mendips hoping to take some lone exposure pictures of the sea etc. Camera in AV on tripod, I attached ND filters to the lens then set smallest aperture, f32, set ISO to 100 and shutter indicated 2sec - a good start I thought but when I pressed the release it wouldn't fire - the little green light (bottom right in viewfinder) blinked which prevents the shutter activation.
I took ND's off, hand held in AV and everything was fine. So what's happening when I attach the ND's? It seems to be confusing the camera so it won't activate.

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keithh e2
11 23.4k 33 Wallis And Futuna
5 Feb 2013 6:31PM
Is it on auto focus?
ikett e2
4 372 England
5 Feb 2013 6:43PM

Quote:Camera in AV on tripod, I attached ND filters to the lens then set smallest aperture, f32, set ISO to 100 and shutter indicated 2sec
Not sure but suspect manual exposure could work.
Coleslaw e2
9 13.4k 28 Wales
5 Feb 2013 6:46PM
What strength ND filter?
Hali e2
4 44 Scotland
5 Feb 2013 6:47PM
How were you focusing - manual or automatic? If automatic, is it possible that there wasn't enough light for the camera to focus?
Nick_w e2
7 4.1k 99 England
5 Feb 2013 6:51PM
What MrH said
colin beeley e2
12 1.1k 10 England
5 Feb 2013 6:55PM
when you use a ND filter you have to go manual mode , you take a reading without the filter ,then you set the camera to manual then take of the 10 stops exposure. the shutter would not work because it was longer than 30secs , when you go beyond that you need to set bulb. 2secs would give you 32mins !! read here about settings might be of help .
mikehit e2
5 7.1k 11 United Kingdom
5 Feb 2013 6:56PM
If you are in single shot mode and on AF it has to be infocus before the shutter will fire and the filters may have made it too dark to focus. Switch to MF as suggested and you should be OK
puertouk e2
3 1.1k 17 United Kingdom
5 Feb 2013 7:29PM
Why not go and spend that money you won on new kit! Tongue
Nick_w e2
7 4.1k 99 England
5 Feb 2013 7:36PM

Quote:When you use a ND filter you have to go manual mode , you take a reading without the filter ,then you set the camera to manual then take of the 10 stops exposure. the shutter would not work because it was longer than 30secs , when you go beyond that you need to set bulb. 2secs would give you 32mins !! read here about settings might be of help .

This would be true for a big stopper, but not standard NDs (typically 3-4 stops not 10).

For 3-4 stop the camera will probably meter OK, maybe a touch under exposed, but the AF that's different, focus on what you want minus filters (or do it manually) then lock the focus.

Quote:When you use a ND filter you have to go manual mode , you take a reading without the filter ,then you set the camera to manual then take of the 10 stops exposure. the shutter would not work because it was longer than 30secs , when you go beyond that you need to set bulb. 2secs would give you 32mins !! read here about settings might be of help .


Many thanks Nick_w - just what I needed! Never tried this before so a steep learning curve!

keithh - yes I was using AF. Ah, very dim picture so probably couldn't lock on!

Thanks everybody = I'll go try again!Wink
Just one point I can't seem to find on the web (must be there somewhere!) If I use more than one ND filter at the same time, do you add the exposure correction or multiply it ie a 2X ND + a 4X ND, does that equal 2 X 4 = 8 or 2 + 4 = 6 ?

As I said, first time trying this!
mikehit e2
5 7.1k 11 United Kingdom
6 Feb 2013 8:33AM
6.
Each stop filter is already x2 on the exposure.
6 Feb 2013 12:43PM
Cheers!

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