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Author Topic: Aptus 22 long exposure question  (Read 2401 times)

mcfoto

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Aptus 22 long exposure question
« on: December 03, 2006, 10:41:44 PM »

Hi
I am quoting on a job which will be on location. How long of an exposure can you get with the Aptus 22? At what point does noise become a factor? I am always shooting flash in the studio so this is new to me.
Thanks Denis
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Denis Montalbetti
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James Russell

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Aptus 22 long exposure question
« Reply #1 on: December 03, 2006, 11:31:39 PM »

Quote
Hi
I am quoting on a job which will be on location. How long of an exposure can you get with the Aptus 22? At what point does noise become a factor? I am always shooting flash in the studio so this is new to me.
Thanks Denis
[{POST_SNAPBACK}][/a]


Anything over 10 seconds on the A-22 shows some noise in the blacks and at 22 seconds it can beccome problematic.

[a href=\"http://www.russellrutherfordgroup.com/22seconds.jpg]http://www.russellrutherfordgroup.com/22seconds.jpg[/url]

Ask Yair, there may be a workaround.

JR
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ericstaud

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Aptus 22 long exposure question
« Reply #2 on: December 04, 2006, 12:07:57 AM »

You have to test it yourself is the short answer,  Especially if its for a job you have to deliver.

A 20 second exposure at 25 ISO will have less noise than a 10 second exposure at 50 ISO, so just turning up the ISO may not work to shorten exposures.  You will probably get different amounts of noise with daylight than with tungsten (a sunset shot vs. interiors).  Raw Developer does a very good job with image noise.  With some of my tests RAW Developer had a better ability to remove hot pixels than the Leaf software (It also makes noise with the P45 more attractive with Phase files than C1 Pro).

The Aptus 75 will give you 50 ASA with the same noise levels that the Aptus 22 will give you at 25 ASA, so it has an advantage in this situation aside from just having more pixels.

Testing, testing, and more testing.  And then test some more.

I think with image noise it is also difficult to predict how noise on your monitor will translate to a print.

Also, be very careful with exposing properly or braketing.  Opening up the shadows in long exposure images will not work like you can with strobe lit images.
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AndrewDyer

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Aptus 22 long exposure question
« Reply #3 on: December 04, 2006, 02:22:19 AM »

G'day Dennis.

I haven't received my Aptus on order yet so I cannot do any testing for you - but to add to Erics comment I would say that I found processing long exposed Aptus files (sent to me as a test from Yair) in LeafCapture much better at dealing with noise than Adobe CR. Particularly with some hot pixels showing up in ACR but not present in LC. I havn't tried RawDev yet so that may be even better.
Good luck.
Andrew
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