What causes the delay in saving a long exposure?

brecklundin · 09-26-2010, 04:21 PM

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...

**Ex Finn.** · 09-26-2010, 04:25 PM

You must be kidding or real bored, right?.
This should be moved to "beginners section".

brecklundin · 09-26-2010, 04:28 PM

Originally posted by Ex Finn.

You must be kidding or real bored, right?.

newly ignored...

**Ex Finn.** · 09-26-2010, 04:30 PM

Works for me.

.

alohadave · 09-26-2010, 04:35 PM

Originally posted by brecklundin

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.

Big G · 09-26-2010, 04:36 PM

Yep, Dark Frame Subtraction or DFS as it's referred to here.

**Ex Finn.** · 09-26-2010, 04:38 PM

How does someone do over 1k posts and not know that?.
No reply necessary BTW.

brecklundin · 09-26-2010, 04:45 PM

Originally posted by alohadave

Your camera is doing noise reduction. Do a search for Dark Frame Subtraction.

Originally posted by Big G

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.

alohadave · 09-26-2010, 05:03 PM

Originally posted by brecklundin

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.

**krs** · 09-26-2010, 05:28 PM

Seems like a reasonable question to me, especialy given this is suppose to be a "friendly" forum where all questions get answered!

uccemebug · 09-26-2010, 05:33 PM

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.

Clicker · 09-26-2010, 05:37 PM

Originally posted by Ex Finn.

How does someone do over 1k posts and not know that?.
No reply necessary BTW.

Lol humor him

**Ex Finn.** · 09-26-2010, 05:59 PM

Originally posted by Clicker

Lol humor him

OK.
Just got back from a hot and dusty county fair, was on a hair-trigger.

brecklundin · 09-26-2010, 06:49 PM

Originally posted by alohadave

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?

Originally posted by krs

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.

Originally posted by uccemebug

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....

Lloydy · 09-27-2010, 01:50 PM

Originally posted by Ex Finn.

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?"

09-26-2010, 04:21 PM	#1
brecklundin Veteran Member Join Date: Jun 2009 Photos: Albums Posts: 1,674	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, 04:30 PM	#4
Ex Finn. Site Supporter Join Date: Nov 2007 Location: Southern Maryland. Espoo. Kouvola. Photos: Gallery \| Albums Posts: 7,975	Works for me..

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09-26-2010, 04:25 PM	#2
Ex Finn. Site Supporter Join Date: Nov 2007 Location: Southern Maryland. Espoo. Kouvola. Photos: Gallery \| Albums Posts: 7,975	You must be kidding or real bored, right?. This should be moved to "beginners section".

09-26-2010, 04:28 PM	#3
brecklundin Veteran Member Join Date: Jun 2009 Photos: Albums Posts: 1,674 Original Poster	Originally posted by Ex Finn. You must be kidding or real bored, right?. newly ignored...

09-26-2010, 04:35 PM	#5
alohadave Veteran Member Join Date: Jan 2008 Location: Quincy, MA Photos: Gallery \| Albums Posts: 2,024	Originally posted by brecklundin 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
Big G Veteran Member Join Date: May 2009 Posts: 581	Yep, Dark Frame Subtraction or DFS as it's referred to here.

09-26-2010, 04:38 PM	#7
Ex Finn. Site Supporter Join Date: Nov 2007 Location: Southern Maryland. Espoo. Kouvola. Photos: Gallery \| Albums Posts: 7,975	How does someone do over 1k posts and not know that?. No reply necessary BTW.

09-26-2010, 04:45 PM	#8
brecklundin Veteran Member Join Date: Jun 2009 Photos: Albums Posts: 1,674 Original Poster	Originally posted by alohadave Your camera is doing noise reduction. Do a search for Dark Frame Subtraction. Originally posted by Big G 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
alohadave Veteran Member Join Date: Jan 2008 Location: Quincy, MA Photos: Gallery \| Albums Posts: 2,024	Originally posted by brecklundin 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
krs Site Supporter Join Date: Aug 2007 Location: St. Louis, MO Photos: Gallery Posts: 395	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
uccemebug Veteran Member Join Date: Sep 2006 Location: Tokyo Photos: Gallery \| Albums Posts: 962	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
Clicker Veteran Member Join Date: May 2008 Photos: Gallery Posts: 3,241	Originally posted by Ex Finn. 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
Ex Finn. Site Supporter Join Date: Nov 2007 Location: Southern Maryland. Espoo. Kouvola. Photos: Gallery \| Albums Posts: 7,975	Originally posted by Clicker 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
brecklundin Veteran Member Join Date: Jun 2009 Photos: Albums Posts: 1,674 Original Poster	Originally posted by alohadave 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? Originally posted by krs 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. Originally posted by uccemebug 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
Lloydy Veteran Member Join Date: Aug 2007 Location: Shropshire, UK Posts: 1,114	Originally posted by Ex Finn. 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?"