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05-07-2010, 05:26 AM   #1
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Help on photo technique

Hi all

QuoteOriginally posted by C.W Tsorotes Quote
I'm not sure if this qualifies as a true long exposure shot, this was made up of about 16 30" exposures + a dark frame shot at 500iso, other than the stacking and enhanced foreground there was actually no post-processing NR applied to either the stars or the foreground.


Hi again

I like this image technique and want to try some myself.

My question is, where should the light be measured? on the sky or city? (on the city lights right ?) Using a grad filter or not ?

Any hints will be helpfull.

Thanks in advance

P.S. - Maybe this thread just be on "POST your photos ?"
P.S. 2 - Image by C.W Tsorotes and taken from https://www.pentaxforums.com/forums/pentax-dslr-discussion/66277-k7-long-expo...ml#post1031046

05-07-2010, 06:30 AM   #2
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I have not taken such a photo yet, but from what I've read in books wouldn't you meter from what you think should be gray in the picture?

so wouldn't you meter off the buildings since that's the most important factor and look to me as gray?
05-07-2010, 07:35 AM   #3
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QuoteOriginally posted by hockmasm Quote
I have not taken such a photo yet, but from what I've read in books wouldn't you meter from what you think should be gray in the picture?

so wouldn't you meter off the buildings since that's the most important factor and look to me as gray?
At night, everything is black.

Better read that book again.
05-07-2010, 07:42 AM   #4
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@ Ira, ... at least hockmasm tried to help and I'm thankfull for that!

So, any ideas ?

05-07-2010, 07:47 AM - 1 Like   #5
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QuoteOriginally posted by netuser Quote
@ Ira, ... at least hockmasm tried to help and I'm thankfull for that!

So, any ideas ?
You won't certainly take a reading off the sky, as that should stay nearly black. Metering the sky would lead to haevy overexposure.

You will not read off the lights, as this will then lead to heavy underexpsoure.

Many old-fashioned photogs use a white sheet of paper, meter that and double the expsoure time, that this reading gives, for night shots.

A reversed Grad ND would be a good idea, to keep the illuminated houses darker and extend the expsoure time (to get longer star trails), without blowing too much in the foreground.

Ben
05-07-2010, 07:54 AM - 1 Like   #6
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Meter off of the palm of your hand. You will normally find that reading or one stop open from that will be just about right.
05-07-2010, 07:58 AM   #7
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Thanks for the hints Parallax and Ben_Edict !!

I think I will also apply a reversed grad
05-07-2010, 08:54 AM   #8
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QuoteOriginally posted by netuser Quote
@ Ira, ... at least hockmasm tried to help and I'm thankfull for that!

So, any ideas ?
If I don't know, I don't suggest.

05-07-2010, 09:17 AM   #9
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QuoteOriginally posted by Ira Quote
If I don't know, I don't suggest.
Fair enought
05-07-2010, 09:21 AM   #10
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You don't "read" the light on such pictures. You have the diaphragm to control the stars in the sky, and the time to control the city lights exposure. You try an opening and a time, and you check the results. Then, you alter the time and opening to adjust the result to your liking. For such pictures, experience is everything. Try to keep the ISO as low as possible to avoid noise. Go on and give it a try. You'll have fun and you'll gain a lot of experience with available light pictures at night. Good luck.
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