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PostPosted: Sat Nov 17, 2007 7:25 pm 
Have any of you 40D owners noticed any "bad pixels" (e.g. dead pixels or hot pixels)? A friend of mine found a link at dpreview (.http://forums.dpreview.com/forums/read. ... e=25646166). I also noticed this on some recent Nikon D3 pics (http://www.robgalbraith.com/bins/multi_ ... -8745-9153). But I digress...Seeing red dots. One 40D owner ended up swapping his for a Sony A700.

Just wondered if this isn't just an isolated problem with the odd 40D. And I was told that all cameras have "bad pixels". Just to a very small degree. Just not noticeably so. True?

Thanks.

I'm about to choose from between the 40D, A700 and the upcoming D300.


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PostPosted: Sun Nov 18, 2007 11:24 am 
Haven't found anything like that on mine yet.... how about you Bob


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PostPosted: Sun Nov 18, 2007 11:38 am 
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Defiant wrote:
Haven't found anything like that on mine yet.... how about you Bob

Yes and No.

For normal photography I haven't seen any problems at all. Astrophotography is a different issue as you will always get hot (rather than dead) pixels but they are pretty easily dealt with.

Bob.

_________________
Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


Last edited by Bob Andersson on Sun Nov 18, 2007 11:47 am, edited 1 time in total.

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PostPosted: Sun Nov 18, 2007 11:41 am 
Bob Andersson wrote:
Defiant wrote:
Haven't found anything like that on mine yet.... how about you Bob

Yes and No.

For normal photography I have seen any problems at all. Astrophotography is a different issue as you will always get hot (rather than dead) pixels but they are pretty easily dealt with.

Bob.


Ah well... won't affect me then too bl***y cold outside for me after dark :lol:


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PostPosted: Sun Nov 18, 2007 2:36 pm 
Thanks for your replies guys. In most cases it doesn't sound like something to be concerned about. I heard it's during long exposures that you might encounter them.

Having said that how would you deal with them Bob? Photoshop?


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PostPosted: Sun Nov 18, 2007 3:28 pm 
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DarkDTSHD wrote:
...how would you deal with them Bob? Photoshop?

As I only see them with astrophotography the software I use (IRIS) has routines to detect and remove them using the Dark Frames (same exposure but with the lens cap on). I wouldn't want to overstate the problem however. The following "clickable" picture is the JPEG as delivered by the camera with the only adjustment being to tweak the Levels to darken the sky. This was a three minute exposure at ISO 1250. Judge for yourself how much of a real issue they are when not pixel peeping. :shock:

Image

Not having seen the problem otherwise I can't really comment. Maybe the Photoshop Despeckle filter would work but that's guesswork on my part.

Bob.

_________________
Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


Last edited by Bob Andersson on Sun Nov 18, 2007 3:34 pm, edited 1 time in total.

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PostPosted: Sun Nov 18, 2007 3:34 pm 
Bob Andersson wrote:
DarkDTSHD wrote:
...how would you deal with them Bob? Photoshop?

As I only see them with astrophotography the software I use (IRIS) has routines to detect and remove them using the Dark Frames (same exposure but with the lens cap on).

Not having seen the problem otherwise I can't really comment. Maybe the Photoshop Despeckle filter would work but that's guesswork on my part

Bob.


Ok thanks Bob. But this isn't a big deal any how. And in most cases isn't an issue for most 40D users any how. Never seen any bad pixels in 99% of the sample pictures I've seen as I've said.


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PostPosted: Sun Nov 18, 2007 3:36 pm 
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DarkDTSHD wrote:
...Ok thanks Bob. But this isn't a big deal any how. And in most cases isn't an issue for most 40D users any how. Never seen any bad pixels in 99% of the sample pictures I've seen as I've said.

Sorry, I added the picture as an afterthought and didn't hit he final Submit until after your reply. :oops:

Bob.

_________________
Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


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PostPosted: Sun Nov 18, 2007 3:45 pm 
Bob Andersson wrote:
DarkDTSHD wrote:
...Ok thanks Bob. But this isn't a big deal any how. And in most cases isn't an issue for most 40D users any how. Never seen any bad pixels in 99% of the sample pictures I've seen as I've said.

Sorry, I added the picture as an afterthought and didn't hit he final Submit until after your reply. :oops:

Bob.


I noticed after I posted my reply. :) Boy do you have a serious bad pixel (white dots) problem. Better have your 40D looked at ASAP!! :)


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PostPosted: Sun Nov 18, 2007 4:06 pm 
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DarkDTSHD wrote:
...Boy do you have a serious bad pixel (white dots) problem. Better have your 40D looked at ASAP!! :)

I wondered what they were! :lol:

Bob.

_________________
Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


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PostPosted: Wed Nov 21, 2007 12:24 pm 
Hello everyone,
Just throwing in more data for statistics,
Been using the 40D since the end of September and had taken quite a lot of shots with relatively long exposures (couple of seconds) and I have not noticed any dead pixels and I know when I see one because all my laptop screens had one of the annoying things!


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PostPosted: Wed Nov 21, 2007 2:27 pm 
espressoroast wrote:
Hello everyone,
Just throwing in more data for statistics,
Been using the 40D since the end of September and had taken quite a lot of shots with relatively long exposures (couple of seconds) and I have not noticed any dead pixels and I know when I see one because all my laptop screens had one of the annoying things!


Thanks for posting. Good to know. :) The 40D is still on my shortlist. Right after the Nikon D300 and before the Sony A700.

I've always liked the Canon system (camera/lens/flash/accessories). As good (moreless) as a Nikon system. Sony has a ways to go IMHO.


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PostPosted: Wed Nov 21, 2007 3:00 pm 
You're welcome.
If I about to choose to system, I'd be stuck between the D200 and the D40 as well.
Apart from all the technical aspects, I just find the Sony A700 to be very..um..ugly. It somehow looks like an unfinished prototype, like those flash cars you see on autoshows. Bu I'm sure it's a great camera.
That D300 though, that is going to be a serious piece of kit.

This probably belongs to the Nikon forum but just for asking,
Will it (D300) have the full remote shooting (from a PC) mode like the 40D? For me, that is much more important than something like an HDMI output.


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PostPosted: Wed Nov 21, 2007 5:28 pm 
espressoroast wrote:
You're welcome.
If I about to choose to system, I'd be stuck between the D200 and the D40 as well.
Apart from all the technical aspects, I just find the Sony A700 to be very..um..ugly. It somehow looks like an unfinished prototype, like those flash cars you see on autoshows. Bu I'm sure it's a great camera.
That D300 though, that is going to be a serious piece of kit.

This probably belongs to the Nikon forum but just for asking,
Will it (D300) have the full remote shooting (from a PC) mode like the 40D? For me, that is much more important than something like an HDMI output.


Regarding the D300...yes it does support WiFi wireless file transfer. Networked even.

And I too find the A700 very ugly. Looks like a child's toy. And if you view the video clip here at Cameralbs for the Sony DT lens you'll hear how LOUD and chep sounding the AF in-camera motor sounds. And the cheap sounding shutter release sound. Matters to me. One among many reasons why I prefer getting either the D300 or 40D. They are built much better inside and out.

Just waiting for the test reports for the D300. Which will include comparisons to the 40D and A700.


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PostPosted: Wed Nov 21, 2007 5:53 pm 
Quote:
chep sounding the AF in-camera motor sounds. And the cheap sounding shutter release sound. Matters to me.


I totally see what you mean. After upgrading to 40D from 350, I couldn't wipe the smile from my face listening to the sound of it for days! :D


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