Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
03-21-2007, 08:13 PM   #1
Veteran Member




Join Date: Sep 2006
Location: Göteborg, Sweden
Posts: 810
Vertical Pattern Noise, sensitivity test

VPN:

The topic has been discussed a lot at the DPR forum. I have tried to understand VPN and the technical reasons for it. While doing so I also have understood that we, all digital camera users, see different things in pictures. Well, that's not hard to guess but it seems as some see VPN and some do not.

I have started a thread at DPR where I ask people to look at at six pictures and reply and let me and anyone know which of the pictures that show VPN. If you are registered over there and not totally fed up by the topic, please have a look there and let the world know more about how we perceive things.

Test: Are you VPN sensitive?: Pentax SLR Talk Forum: Digital Photography Review

Thank you,


Last edited by Jonas B; 03-21-2007 at 08:14 PM. Reason: forgot the link...
03-22-2007, 05:42 AM   #2
Pentaxian




Join Date: Sep 2006
Location: West Chester, PA
Photos: Gallery | Albums
Posts: 1,420
Hey, Cideway!

Good e-mail.

You're right, too.
03-22-2007, 06:03 AM   #3
Inactive Account




Join Date: Feb 2007
Location: Adelaide, South Australia, Australia
Photos: Gallery
Posts: 364
QuoteOriginally posted by carpents Quote
Good e-mail.

You're right, too.
Cheers, i notice that my old mate UltraWide didn't pick up my stuff up in the last paragraph, it was ment to read "higher ISO" not "higher aperture".
03-22-2007, 04:10 PM   #4
Inactive Account




Join Date: Feb 2007
Location: Canada
Posts: 292
RE: VPN,

#1 bit noise in the dark area but no VPN
#2 none
#3 none
#4 none
#5 none
#6 none

I don't know if it's my eyesight or my flat screen CRT monitor, I really don't notice any VPN that may attract my attention. Very nice test though.


Cheers,

Rene R

03-22-2007, 05:38 PM   #5
Senior Member
Dana G's Avatar

Join Date: Oct 2006
Location: Masachusetts
Posts: 245
Has anybody tested all this alleged noise by making prints? After all, a print is still the main object of most photographs.

Personally, unless I'm pushing a badly underexposes image, I've never had a problem. And printing underexposed film gives you pretty marginal results as well.
03-22-2007, 05:45 PM   #6
Site Supporter
slip's Avatar

Join Date: Oct 2006
Location: 2 hours north of toronto ontario canada
Photos: Gallery | Albums
Posts: 3,515
I don't see any either.
I would say don't worry to much about it, since prints are what really count in the end.
I do see a bit of noise, likely from higher ISO.

cheers

randy
03-22-2007, 05:50 PM   #7
Senior Member
Dana G's Avatar

Join Date: Oct 2006
Location: Masachusetts
Posts: 245
QuoteOriginally posted by slipchuck Quote
I don't see any either.
I would say don't worry to much about it, since prints are what really count in the end.
I do see a bit of noise, likely from higher ISO.

cheers

randy
You'll see lots of noise/grain from high ISO film as well as digital. There's no such thing as a free lunch!
03-22-2007, 05:59 PM   #8
Site Supporter
Mallee Boy's Avatar

Join Date: Sep 2006
Location: Hindmarsh Isl. Sth Australia
Photos: Gallery | Albums
Posts: 3,485
Hi Jonas,
Didn't someone post a test chart with stripes on dpr some months back?

Then, as now, my Toshiba laptop monitor shows "something" in verticle stripes in the noisy background on No's 3 & 5, and to clarify that, on a first look I see nothing, but of course being told there is something there...one keeps looking....and I think its a "yes" I can see something.
However on my LG monitor it is even less visible.

Cheers
Grant

03-22-2007, 06:12 PM   #9
Veteran Member




Join Date: Sep 2006
Location: Göteborg, Sweden
Posts: 810
Original Poster
Let me second that.
03-22-2007, 06:17 PM   #10
Veteran Member




Join Date: Sep 2006
Location: Göteborg, Sweden
Posts: 810
Original Poster
I may have missed that test chart thing Grant. The pictures in the "test" are choosen as they are not strange or pushed test charts. I think that's more interesting.
I am interested in the "scientific" part of it as well but more interested in real world photos.

I'm also very much interested in pushing Pentax to fix this in the next model - then I can get back to use Pentax!
03-22-2007, 06:19 PM   #11
Veteran Member




Join Date: Sep 2006
Location: Göteborg, Sweden
Posts: 810
Original Poster
I have posted a reply to everything in the thread over at DPR. I'm sorry for not expressing myself more clear: I never intended to have the discussion at both places simultaneously. Sorry for the confusion.
03-22-2007, 09:05 PM   #12
Senior Member




Join Date: Mar 2007
Location: California
Photos: Gallery
Posts: 239
Here's a few real world pictures where you may or may not see VPN. These are JPEG's straight from the camera except for the resizing. The VPN is definitely visible if you increase the brightness / exposure, but I think whether you see it in these pictures depends a lot on your monitor and ambient light levels (it'll be more visible on the 1800x1200 images).

K10D | 21mm | f/3.2 | ISO 800 | 1/4 sec | 1800x1200


K10D | 21mm | f/3.2 | ISO 800 | 1/5 sec | 1800x1200


K10D | 21mm | f/3.2 | ISO 1600 | 1/5 sec | 1800x1200


K10D | 21mm | f/3.2 | ISO 800 | 0.6 sec | 1800x1200


K10D | 21mm | f/3.2 | ISO 100 | 5 sec | 1800x1200
03-22-2007, 09:05 PM   #13
Site Supporter
Mallee Boy's Avatar

Join Date: Sep 2006
Location: Hindmarsh Isl. Sth Australia
Photos: Gallery | Albums
Posts: 3,485
No confusion...well at least I think not
I have no doubt the pentax people are getting all sorts of feedback on various issues at the moment and I'm sure the K10D.2 will be even better.
But for now I'm still happy with the Ds and see no case for change. :ugh:
03-22-2007, 09:43 PM   #14
Veteran Member




Join Date: Sep 2006
Location: Göteborg, Sweden
Posts: 810
Original Poster
Thank you Walter. I wish one or two of your pictures had been there in my little "test". I like the feet in the second picture...
And yes, I can see the VPN in all of them, that's how sensitive I am... I may throw in a link to your post over there if you don't mind. Or you may post one yourself.
03-22-2007, 09:45 PM   #15
Veteran Member




Join Date: Sep 2006
Location: Göteborg, Sweden
Posts: 810
Original Poster
Grant, I have high hopes for the K10D2 (K11D, K20D, whatever). There is something very appealing in many of the K10D pictures that I envy, especially thinking of gradations and B&W work. regards,
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
camera, dpr, dslr, forum, look, photography, pictures, test, topic, vpn
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Is this noise pattern normal? pre86 Pentax DSLR Discussion 8 08-18-2009 11:17 AM
Strange K10D noise pattern miriya Pentax DSLR Discussion 6 03-15-2009 10:09 AM
K20D shadow noise pattern Code Pentax DSLR Discussion 12 06-03-2008 06:07 PM
K10D and weird noise pattern quickpix Pentax DSLR Discussion 14 01-28-2008 03:56 PM
K10D vertical pattern noise problem chals Pentax DSLR Discussion 4 02-06-2007 10:02 PM



All times are GMT -7. The time now is 03:57 AM. | See also: NikonForums.com, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top