K7 FPS and in-camera noise reduction


mille19

Link Posted 04/03/2010 - 15:43
I am covering the Grizedale Rally(car) this Saturday it will be the first time Iíve used my new K7 in anger.
I always shoot in Raw and need fast FPS, can anyone tell me if having in-camera noise reduction on slows down the FPS on the K7.
Cheers
Steve

ChrisA

Link Posted 04/03/2010 - 15:49
Well it must slow it down a little, since by definition, dark frame subtraction adds a shutter-closed 'exposure' equal in length to the actual exposure. Then, presumably, there's a little processing time.

Whether this is significant with already very short exposures, I'd doubt, but isn't this the sort of thing you'd want to know for certain, by trying it out for yourself first?
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Pentax K-3, DA18-135, DA35 F2.4, DA17-70, DA55-300, FA28-200, A50 F1.7, A100 F4 Macro, A400 F5.6, Sigma 10-20 EXDC, 50-500 F4.5-6.3 APO DG OS Samsung flash SEF-54PZF(x2)
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Last Edited by ChrisA on 04/03/2010 - 15:50

Anvh

Link Posted 04/03/2010 - 16:32
The lens correction options takes a lot of time I would certainly set those off, noise reduction shouldn't hit the FPS preformance unless you fill the buffer.
Stefan


K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ

mike3legs

Link Posted 04/03/2010 - 16:56
Does the in camera noise reduction effect RAW files?

I thought it was just Jpegs that had any NR on them.

iceblinker

Link Posted 04/03/2010 - 17:00
The K-7 does not perform DFS with fast shutter speeds, so that is a non-issue when shooting fps.

High-ISO NR is different. I haven't tested if it affects speed, but you can leave it turned off all the time anyway and do NR afterwards.
~Pete

iceblinker

Link Posted 04/03/2010 - 17:01
ChrisA wrote:
Whether this is significant with already very short exposures

It (DFS) is not even activated for very short exposures. But that's not the only NR the camera can do, even with RAW.
~Pete

mille19

Link Posted 04/03/2010 - 17:51
I think I'll just turn NR off to be on the safe side.

Anvh

Link Posted 04/03/2010 - 17:59
iceblinker wrote:
High-ISO NR is different. I haven't tested if it affects speed, but you can leave it turned off all the time anyway and do NR afterwards.

Wouldn't it just happily fill the buffer while the processor takes his time reducing the noise?
Stefan


K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ

PG

Link Posted 04/03/2010 - 18:00
Turn off NR, Distortion and CA correction. That should allow you to shoot at the rated 5 fps until the camera buffer is full.
PhilipGoh.com - Wedding and Portrait Photographer

iceblinker

Link Posted 04/03/2010 - 19:07
Anvh wrote:
iceblinker wrote:
High-ISO NR is different. I haven't tested if it affects speed, but you can leave it turned off all the time anyway and do NR afterwards.

Wouldn't it just happily fill the buffer while the processor takes his time reducing the noise?

I don't know, I haven't tested it. It depends how quickly it does the NR.
~Pete

Anvh

Link Posted 04/03/2010 - 19:45
iceblinker wrote:
I don't know, I haven't tested it. It depends how quickly it does the NR.

How quick it does the NR isn't important right if it first upload the image in the buffer the sensor is ready to make the other photo, so it shouldn't have an impact on shooting speed but I can just as easily be wrong though.
Stefan


K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ

iceblinker

Link Posted 04/03/2010 - 22:39
Shouldn't that also apply to lens correction, then? But it doesn't, indicating that the camera doing more than one thing at once slows it down.
~Pete

Mongoose

Link Posted 05/03/2010 - 10:34
at a guess, the buffer has limited bandwidth for data transfer, so if the CPU is using some reading the previous frame for NR/CA/Distortion correction then there is less available for dumping a new frame to the buffer, slowing the whole thing down.

They made a big thing about how the K10D had 800MB/s DDR SDRAM for its buffer. If K10D, which had no CA/D correction to do and a top speed of ~3FPS at 10MPix, needed RAM that fast, K7 surely needs more.
you don't have to be mad to post here



but it does help

terje-l

Link Posted 05/03/2010 - 11:00
If fast shooting is your prime requirement, I would consider shooting in JPEG, and even reduce the quality slightly to increase speed even more.
Best regards
Terry

K20D, Optio I10, DA 18-55 1:3.5-5.6 AL II, A 1:1.7/50, D FA 1:2.8/100 Macro, Sigma 70-300 1:4-5.6 APO DG Macro, Pentax AF 360FGZ
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