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09-26-2010, 04:21 PM   #1
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What causes the delay in saving a long exposure?

Hey folks,

I think I know the answer here but wanted to ask since it has always been unconfirmed since, well, I never asked or ran across a similar question (now watch someone pull a thread outta their arse for me!! hehehehe...if you can...thanks!)

but I have been curious about the long delay, usually similar or longer than the exposure itself when taking a longer, say 30-secs or longer, shots. It also happens at exposures shorter than 30-secs but that is not quite as annoying except when shooting fireworks.

I had thought it has to do with stuff like DFS and other processing stuff, I shoot RAW but know DFS does happen on longer exposures, but is it the bottleneck?

And my K20D is not really different, though it does feel a but slower at saving, than my 40D was...could be as simply as the CF vs. SDHC cards too because CF is a lot fast from all of my uses vs. SDHC, it just seems to suck up data streams like a sponge.

Anyway, thoughts would be fun to read since I am not up for working today. Plus it's not new gear talk debate stuff...

09-26-2010, 04:25 PM   #2
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You must be kidding or real bored, right?.
This should be moved to "beginners section".
09-26-2010, 04:28 PM   #3
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QuoteOriginally posted by Ex Finn. Quote
You must be kidding or real bored, right?.
newly ignored...
09-26-2010, 04:30 PM   #4
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Works for me..

09-26-2010, 04:35 PM   #5
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QuoteOriginally posted by brecklundin Quote
but I have been curious about the long delay, usually similar or longer than the exposure itself when taking a longer, say 30-secs or longer, shots. It also happens at exposures shorter than 30-secs but that is not quite as annoying except when shooting fireworks.
Your camera is doing noise reduction. Do a search for Dark Frame Subtraction.
09-26-2010, 04:36 PM   #6
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Yep, Dark Frame Subtraction or DFS as it's referred to here.
09-26-2010, 04:38 PM   #7
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How does someone do over 1k posts and not know that?.
No reply necessary BTW.
09-26-2010, 04:45 PM   #8
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QuoteOriginally posted by alohadave Quote
Your camera is doing noise reduction. Do a search for Dark Frame Subtraction.
QuoteOriginally posted by Big G Quote
Yep, Dark Frame Subtraction or DFS as it's referred to here.
Ok...that was what I had been suspecting, it is due to the DFS...so, on bodies like saaaaay, a K-5 where we can (maybe) turn it off then the delay will be a lot less? Leaving DFS to me if I choose to use a reference shot and do it myself in post? DFS is sorta magic to me and I only learned about it this year.

09-26-2010, 05:03 PM   #9
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QuoteOriginally posted by brecklundin Quote
Ok...that was what I had been suspecting, it is due to the DFS...so, on bodies like saaaaay, a K-5 where we can (maybe) turn it off then the delay will be a lot less? Leaving DFS to me if I choose to use a reference shot and do it myself in post? DFS is sorta magic to me and I only learned about it this year.
Yes, if you can turn off DFS, then you can do your own dark frame and apply it later.
09-26-2010, 05:28 PM   #10
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Seems like a reasonable question to me, especialy given this is suppose to be a "friendly" forum where all questions get answered!
09-26-2010, 05:33 PM   #11
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Yeah I'm with krs on that. Like the OP I wondered about that delay myself. Unlike the OP I had NFI what was going on.
09-26-2010, 05:37 PM   #12
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QuoteOriginally posted by Ex Finn. Quote
How does someone do over 1k posts and not know that?.
No reply necessary BTW.
Lol humor him
09-26-2010, 05:59 PM   #13
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QuoteOriginally posted by Clicker Quote
Lol humor him
OK.
Just got back from a hot and dusty county fair, was on a hair-trigger.
09-26-2010, 06:49 PM   #14
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QuoteOriginally posted by alohadave Quote
Yes, if you can turn off DFS, then you can do your own dark frame and apply it later.
As always, thanks Dave...ya learn something every day, right?

QuoteOriginally posted by krs Quote
Seems like a reasonable question to me, especialy given this is suppose to be a "friendly" forum where all questions get answered!
Thanks and yes but lately maybe not so much...up to the rest of us I suppose.

QuoteOriginally posted by uccemebug Quote
Yeah I'm with krs on that. Like the OP I wondered about that delay myself. Unlike the OP I had NFI what was going on.
GMTA...hehehehe....
09-27-2010, 01:50 PM   #15
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QuoteOriginally posted by Ex Finn. Quote
How does someone do over 1k posts and not know that?.
No reply necessary BTW.
Because we're not all as smart as you, or should that be "smart arse?"
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