Noise on K7


aliengrove

Link Posted 31/03/2010 - 14:58
I seem to be getting a lot of noise with my K7 at ISO 400 or above on any exposures more than about 1/2 second, and a fair bit on anything at ISO 200 on longer exposures. Is this inherent in the camera, or am I doing something wrong? Also does anyone have any recommendations for noise reduction? I am using Noise Ninja, but have to use auto-profile as there is no profile for the K7.
Thanks,
Jon.
Flurble

My Website
PPG
flickr
G+
Facebook

Anvh

Link Posted 31/03/2010 - 15:17
Shooting JPG or RAW?
Maybe a sample photo might be helpful.
Stefan


K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ
Last Edited by Anvh on 31/03/2010 - 15:18

aliengrove

Link Posted 31/03/2010 - 15:53
Shooting RAW. Here's a pic (3 pics stitched together) I took last night, 4 secs at ISO 200, f8. This is after applying noise reduction, it was much worse than this. there's also some pixellation about a third of the way in from the left hand side.



Flurble

My Website
PPG
flickr
G+
Facebook
Last Edited by aliengrove on 31/03/2010 - 15:58

paulgee20

Link Posted 31/03/2010 - 16:47
Hi Stefan

Interested in your further comments on this as you receive further info?

I am planning on buying a K7 in early May, so all and any help is helpful?

Kind Regards


Paul
K5's (2)both gripped, K10d gripped, Pentax 28-90 f3.5, Sigma 18-250mm, Sigma 150-500mm. Sigma 105mm f/2.8 EX DG Macro, Sigma 10-20 f.4-5.6.EX DC, Hoya 135 f2.8, Take on 28mm f2.8 Pentax AF360 flash, 2 fill in slaves. 30 metre remote release, Rt angle viewfinder, Giotto NOT 3261B Tripod with Manfrotto 808Rd4 ball head, Manfroto 4861RC2 monopoly, shoulder stock, various filters etc, Panasonic SET HBS HD Video cam, Tamrac Explorer 8x backpack and a sore back.....
-------------------------------------------------------
Photography is an index for measuring futility and pride.......

Paul

:wink
http://s743.photobucket.com/home/pg20_photos/index http://www.flickr.com/photos/pg20

Anvh

Link Posted 31/03/2010 - 16:59
Thank you ALiengrove, the smaple looks very clean so it's hard to say something about that do you've a 100% crop without too much PP?
I know that noise can be very visible in "bland" parts of the photo such as skies, because of lack of things going on every little bit of noise is very visible, might this be a problem?
You should slightly over expose your photo but not clip it and then bring the exposure down in PP, that would deal with most of the noise.

Paul I ain't the one to solve this problem because I don't have a K7.
I asked RAW or JPG because with JPG there are settings in the camera that influence noise but since Aliengrove doesn't use JPG I can't help further someone knowing the K7 must take it over.
I know that the K7 can certainly preform and it's handling is one of the best.
I see you've a K10D, that one still delivers the best photos at very low iso that's why I'm a bit reluctant to get a K7 because most of my shots are in the studio at ISO 100 to 200...
Stefan


K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ
Last Edited by Anvh on 31/03/2010 - 17:08

pentaxanne

Link Posted 31/03/2010 - 17:04
i tested at 4 seconds iso 800 1600 and 3200, and get alot of hot pixels,
i think this was a problem with the k20 early on.
also with the lens cap on.
Last Edited by pentaxanne on 31/03/2010 - 17:06

aliengrove

Link Posted 31/03/2010 - 17:16
This is a 100 percent crop from an image taken at 800 iso, 1/25 of a sec, no pp. There seems a lot of noise and the longer the exposure, the worse it gets.



Flurble

My Website
PPG
flickr
G+
Facebook

aliengrove

Link Posted 31/03/2010 - 17:23
And here's a 100 percent crop from the panorama before editin, ISO 4oo, 4 secs, f8. Am i just expecting too much from the camera?



Flurble

My Website
PPG
flickr
G+
Facebook

Anvh

Link Posted 31/03/2010 - 17:38
Aliengroove I would say the noise is the same with both of them.
I think your monitor is to blame not being able to produce the slight variations of black, the brighter sky in the second photo is much easier to display for TFT/LCD screens.

I at least don't find it out of the ordinary although the ISO800 exposure does look good for such a high number
Stefan


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

gartmore

Link Posted 31/03/2010 - 17:55
This looks to me just as I would expect, do you have the dark frame subtraction turned off?
Ken
“We must avoid however, snapping away, shooting quickly and without thought, overloading ourselves with unnecessary images that clutter our memory and diminish the clarity of the whole.” - Henri Cartier-Bresson -

aliengrove

Link Posted 31/03/2010 - 18:01
What is dark frame subtraction? On my monitor the iso 800 shot appears to have much more noise. And thanks very much for taking the time to look at the pics and answer my question!

Rgds,
Jon
Flurble

My Website
PPG
flickr
G+
Facebook
Last Edited by aliengrove on 31/03/2010 - 18:02

Greytop

Link Posted 31/03/2010 - 18:02
Doesn't look too bad to me either.
Regards Huw

flickr

aliengrove

Link Posted 31/03/2010 - 18:08
I guess it must be my monitor then. It's an LCD monitor, does anyone know how I can fix it? It's going to be difficult doing noise reduction and sharpening with it as it is.

Rgds,
Jon.
Flurble

My Website
PPG
flickr
G+
Facebook
Last Edited by aliengrove on 31/03/2010 - 18:09

Anvh

Link Posted 31/03/2010 - 18:13
Do you see it now

It's not fair to do it this way but it shows you there is more there then you think.


Stefan


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

K10D

Link Posted 31/03/2010 - 18:13
Here is a similar shot, from a K7.Probably from the same location?




This was taken just after 5 AM. Noise not an issue or it is?

Regards
Add a Comment
You must be registered or logged-in to comment.