K5 sensor overheating/on way out?
Posted 24/01/2012 - 12:12
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That's an idea. I've never got the blu tac mear on the eyepiece, but it does leave residue on the rubber surround. I'm thinking of switching to a piece of black electrical tape attached to the flash cover.
Pentax pour des images riches en détails!
Posted 24/01/2012 - 12:32
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I use the anti-smear blutac, which is red.
Posted 24/01/2012 - 20:50
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Thanks for resurrecting this topic...it's reinforced my assumptions after trying out my own '10-stop ND' filter for the first time, about 3 weeks ago.
This was one of the best of a bad bunch!
[IMG]http://i226.photobucket.com/albums/dd296/stopher555/IMGP0793.jpg[/IMG]
The sun was quite strong and coming in from the right hand side.
Right...now where did I put that eyepiece cover?
This was one of the best of a bad bunch!
[IMG]http://i226.photobucket.com/albums/dd296/stopher555/IMGP0793.jpg[/IMG]
The sun was quite strong and coming in from the right hand side.
Right...now where did I put that eyepiece cover?
Posted 24/01/2012 - 22:16
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I think this is almost 100% definitely light leakage, either via the eyepiece or at the filter end. I have experienced the same issues taking Infra-red shots with my K-x and a screw on Hoya filter, but only in certain lighting ocnditions which re-inforces the fact that it is leakage of light. I suspect the petal hood on my lens is partly to blame as it only seems to happen when there is strong front/side lighting.
I'm sure there's nothing wrong with the sensor; the flare streaks are not in the same place on all shots.
Regards
David
I'm sure there's nothing wrong with the sensor; the flare streaks are not in the same place on all shots.
Regards
David
Posted 24/01/2012 - 23:24
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I had exactly that same effect when I used a welding glass blu-tacked to a filter ring.
Two things cured it :-
A black electricians tape around the edges of the glass
B Blacking out the eyepiece (see my previous comment)
regards
Bernard
Two things cured it :-
A black electricians tape around the edges of the glass
B Blacking out the eyepiece (see my previous comment)
regards
Bernard
Posted 25/01/2012 - 11:05
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Mmmm,
I have had a similar problem using Lee 10stop filters.
Then I fitted the viewfinder cap and it all went away.
Also streaking caused by poor sensor cleaning.
As has been suggested try a 'wet'clean.
I have only had the K5's for a few months but I have had exposures of three, four and almost five minutes and had no signs of sensor overheating.
I have had a similar problem using Lee 10stop filters.
Then I fitted the viewfinder cap and it all went away.
Also streaking caused by poor sensor cleaning.
As has been suggested try a 'wet'clean.
I have only had the K5's for a few months but I have had exposures of three, four and almost five minutes and had no signs of sensor overheating.
Chunky
Posted 03/05/2012 - 13:55
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johnriley wrote:
I understand, perhaps I don't experience this as a problem because I'm still stood behind the camera, so it's in shadow anyway.
On the face of it, to have so long and exposure in light bright enough to cause a problem, seems like quite an extreme situation, so is this happening when very dark ND filters are being used?
Light leakage in cameras has always existed, but usually the exposure is so short it's not obvious and usually it affects the metering more than anything else. I would have expected the flipped up mirror to seal off any leakage from the prism area.
Sorry to resurrect an old thread, I found this whilst trying to find evidence that this, indeed, exists. But to explain John's point above, it's all to do with which ND you're using. Imagine light leakage through the viewfinder as constant, if you're using ND110 then that leakage may outweigh the light reaching the sensor through the filter, so it can show. If you're using ND2 it probably won't be nearly as bright as the light coming through the lens so it's not an issue.
I understand, perhaps I don't experience this as a problem because I'm still stood behind the camera, so it's in shadow anyway.
On the face of it, to have so long and exposure in light bright enough to cause a problem, seems like quite an extreme situation, so is this happening when very dark ND filters are being used?
Light leakage in cameras has always existed, but usually the exposure is so short it's not obvious and usually it affects the metering more than anything else. I would have expected the flipped up mirror to seal off any leakage from the prism area.
... just another middle-aged guy with a hobby. I have an extreme macro learning site at extreme-macro.co.uk - Pentax-centric, your feedback and comments would be appreciated!
Posted 04/05/2012 - 11:22
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A couple of points: black velevet scrunchies that girls tie their hair back with are exactly the right size to fit around a lens barrel and block out reflected light on Cokin and similar filter systems. Get down to your local branch of Accessorize with 90p in your hand.
Light entering the viewfinder has always been a problem. Arriflex cine cameras have an optional viewfinder with spring-loaded blinds which close when you take your eye away from it although it can get uncomfortable pressing your eye to it for long periods.
Light entering the viewfinder has always been a problem. Arriflex cine cameras have an optional viewfinder with spring-loaded blinds which close when you take your eye away from it although it can get uncomfortable pressing your eye to it for long periods.
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 -
“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 -
Posted 05/05/2012 - 21:35
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Interesting thread, proves that having a eyecap cover really does work.
Now I am thinking, for landscape use, there is one solution albeit pricy over an eyecap or scruntchie, In fact it could be this thing's USP.
The K-01!
Told it was not a cheap option, but in fact, could be a very useful one.
hmmmmm
Now I am thinking, for landscape use, there is one solution albeit pricy over an eyecap or scruntchie, In fact it could be this thing's USP.
The K-01!
Told it was not a cheap option, but in fact, could be a very useful one.
hmmmmm
Some Cameras
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1776 posts
17 years
Burton upon Trent
I use a small rectangular piece of black plastic, cut from a tape casette box, 33x22mm with the corners rounded.
This tucks under the rubber surround.
The official one is IMO a complete pain as it requires the rubber surround to be removed, which invariably moves the adjustment.
regards
Bernard