Problem with my D70 :(

Helium_Junkie

Helium_Junkie

Helium_Junkie

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So I decided to try some long exposures of the night sky, and was very dismayed to find the following in the top left corner of every shot I took, on several lenses :(

Anyone know whats going on? :(
The effect worsens the longer the exposure, this was ~15mins.

star1.jpg


This was much less, but the effect is still apparent:

star2.jpg
 
I first thought that also, but it happens at any angle, on any subject, any time, any place. The first was in my garden, the second was a campsite in devon with a hood and the eyepiece covered. Ive tried with other lenses and still no joy :(

Ive changed all the variables, the problem persists :(
 
I'd take it to a nikon dealer and ask them for an opinion, take some copies of the photos (printed best but electronically would do) to show the problem. I doubt i can mention them as competitors but their are (at least) 2 very good nikon dealers in london (not a million miles from you). email in trust if you want a pointer...
 
There's a likelihood there is a light leak into the body and a seal might have been broken. Not big enough to affect normal shots but obviously in long exposure it comes out.

If it was sensors on the CCD then it would be a de-facto set area rather than looks like its spreading the longer to open the lens.
 
Funny you should mention that...

(I've abused this in RSE to exagerate the effect :p)


DSC_3985-01-S.png



Can anyone say 'design flaw' ?
 
Canon provides a clip on the shoulder strap to cover the viewfinder during long exposures. Check with Nikon to see if they do something similar.
 
Already tried that SDK, but ta :)

Wel Nikon told me to send it back to them, will check if its still warranteed when I get in, should be though, I dont think ive even had it a year!

...Divine, you seriously had the same problem?! :eek:
 
DO NOT TAKE YOUR CAMERA IN FOR REPAIRS. It's a waste of money because this isn't something you can repair - I'll explain thusly, but just wanted to get that message across.
The D70, like all digital cameras, suffers from hot pixels under long exposure situations. However, a lot of Nikon's DSLR's also have this purple haze issue - it's caused by elements near the sensor which get.... Hot... During long exposures - the higher the ISO, the more exemplified this effect becomes. The D50, D100 & D200 all have this issue (although it's much less apparent with the D200). You won't have noticed it before because you need either seriously long exposures or very long exposures & a high ISO.
But fear not.
Simply by turning on dark frame subtraction (Long exposure NR) you can completely eliminate this. Assuming the latest firmware (but is probably the same with older firmware, too) go to shooting menu > long exposure NR > ON.
This will take a second exposure, of equal length to the first, with the mirror down & shutter closed - and then subtract the results from the first, cleverly mapping in extra pixels from surrounding areas where required. The advantages here are twofold, as you'll also get rid of the hot pixels you're inevitably experiencing (although they may look like stars in shots like these ;) ).
It does of course mean that your exposures are doubled, so if you're doing 30 mins, be prepared to wait an hour. Also, make sure you have plenty of battereeee powah :)
 
hoodmeister said:
DO NOT TAKE YOUR CAMERA IN FOR REPAIRS. It's a waste of money because this isn't something you can repair - I'll explain thusly, but just wanted to get that message across.
The D70, like all digital cameras, suffers from hot pixels under long exposure situations. However, a lot of Nikon's DSLR's also have this purple haze issue - it's caused by elements near the sensor which get.... Hot... During long exposures - the higher the ISO, the more exemplified this effect becomes. The D50, D100 & D200 all have this issue (although it's much less apparent with the D200). You won't have noticed it before because you need either seriously long exposures or very long exposures & a high ISO.
But fear not.
Simply by turning on dark frame subtraction (Long exposure NR) you can completely eliminate this. Assuming the latest firmware (but is probably the same with older firmware, too) go to shooting menu > long exposure NR > ON.
This will take a second exposure, of equal length to the first, with the mirror down & shutter closed - and then subtract the results from the first, cleverly mapping in extra pixels from surrounding areas where required. The advantages here are twofold, as you'll also get rid of the hot pixels you're inevitably experiencing (although they may look like stars in shots like these ;) ).
It does of course mean that your exposures are doubled, so if you're doing 30 mins, be prepared to wait an hour. Also, make sure you have plenty of battereeee powah :)
Click to expand...

Clever :p And i thought you shoot Canon gear :D
 
Raymond Lin said:
Clever :p And i thought you shoot Canon gear :D
Click to expand...


He's a Nikon boy because I told him to buy a D70 a few months back (as a joke) and he only went and bloody bought one!

(I'm glad he did though, he's got some serious talent)
 
divine_madness said:
He's a Nikon boy because I told him to buy a D70 a few months back (as a joke) and he only went and bloody bought one!

(I'm glad he did though, he's got some serious talent)
Click to expand...

Grrrrrrrrrrrrrr, I am a Canon boy dammit and he lives close(ish) to me so no swapping lenses. :p
 
Raymond Lin said:
Grrrrrrrrrrrrrr, I am a Canon boy dammit and he lives close(ish) to me so no swapping lenses. :p
Click to expand...

Should have chosen a decent system in the first place perhaps? :p



*runs from the possible ensuing chaos*
 
divine_madness said:
Should have chosen a decent system in the first place perhaps? :p



*runs from the possible ensuing chaos*
Click to expand...

Pardon? What was that? Can't hear sorry, too much noise!

/looks in camera bag and sees D100...

DANG!
 
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