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Long Exposure Purple Blooming

ThaQuest

US
4 posts

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ThaQuest Registered since 04th Aug 2006
Fri 04-Aug-06 09:28 PM

This is one of the things keeping me away from the Nikon line right now. I am heavily into long exposure photography at night, and I don't like having to wait twice as long for darkframe subtraction. Especially when you are exposing for 15 minutes to an hour. Do you think Nikon will have re-arranged the camera's internal parts so as to avoid this purple blooming problem? I'm sure hoping so.

Also, on another note, from the pics at Ken Rockwell, the viewfinder looks much bigger, ala D200. Lets hope it really is that way!

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Daily Photos of China: http://www.xanga.com/jessewarren

Daily Photos of China: http://www.xanga.com/jessewarren

nosingchum

Richmond, CA
405 posts

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#1. "RE: Long Exposure Purple Blooming" | In response to Reply # 0

nosingchum Registered since 31st Oct 2005
Sun 06-Aug-06 04:04 AM

Not to sound facetious but Nikon already makes SLRs that have no such problems with this. They take 35mm film and you don't have to wait for long exposure subtraction Do you do astrophotography and/or star trails?

Simon

A Richmond, B.C. Nikonian
- FM2n, F100, D300, D800

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ThaQuest

US
4 posts

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#2. "RE: Long Exposure Purple Blooming" | In response to Reply # 1

ThaQuest Registered since 04th Aug 2006
Mon 07-Aug-06 02:06 AM

SLRs are nice, but not for me right now. And probably for most people reading this forum too. DSLR users are out of luck here, and if the D80 remedies this situation, then kudos to Nikon.

Daily Photos of China: http://www.xanga.com/jessewarren

Daily Photos of China: http://www.xanga.com/jessewarren

nosingchum

Richmond, CA
405 posts

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#3. "RE: Long Exposure Purple Blooming" | In response to Reply # 2

nosingchum Registered since 31st Oct 2005
Mon 07-Aug-06 10:52 PM

The D50 is reportedly one of the better DSLRs in terms of long exposure thermal noise. I think Ken Rockwell did a test and it took a 15 minute exposure before anything showed up. Perhaps the D80 will inherit the same (or better) thermal characteristics. One can only hope.

As an aside, you can simulate a long exposure by digitally stacking a series of shorter exposures, thereby neatly working around the thermal noise (and other hardware/battery limits). Depending on the length of the "short" exposure, you may not even need to do noise subtraction. I know this has been done before to take long exposure star trails with DSLRs.

Simon

A Richmond, B.C. Nikonian
- FM2n, F100, D300, D800

Visit my Nikonians gallery.

blw

Richmond, US
28713 posts

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#4. "RE: Long Exposure Purple Blooming" | In response to Reply # 0

blw Moderator Awarded for his high level of expertise in various areas Nikonian since 18th Jun 2004
Mon 07-Aug-06 11:18 AM

I think the problem is harder than it appears on the surface. The thermal heat appears to be conducted onto the sensor via its data connections, rather than through incidental surface contact. Unless one can get the sources of the heat to make less of it, I think it will be difficult to sort out. I know this from being peripherally involved in similar electronic projects.

I'm sure they've been working on the equivalent of less heat, which is less power, because that makes the batteries last longer.

_____
Brian... a bicoastal Nikonian and Team Member

My gallery is online. Comments and critique welcomed any time!

kd5boc

Abilene
142 posts

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#5. "RE: Long Exposure Purple Blooming" | In response to Reply # 4

kd5boc Registered since 22nd Nov 2005
Tue 08-Aug-06 02:14 AM

So far, I've got a "blooming frame" that I just subtract from my long night shots in PS. I really need to make another before the Persied Meteor Shower...

Tom

---------------
What does your Mind's Eye show you?

Nikon D50
18-55 kit lens
Sigma 70-300 f/4-5.6 Macro
Mac OS X

vultureacs

Strasbourg, FR
784 posts

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#6. "RE: Long Exposure Purple Blooming" | In response to Reply # 5

vultureacs Basic Member
Tue 08-Aug-06 12:53 PM

Do you think Nikon will have re-arranged the camera's internal parts so as to avoid this purple blooming problem? I'm sure hoping so.

Have you ever thought about the fact that ANY DSLR needs:
-power connections to the sensor
-data connections to the sensor
-power connections to the mirror
-power connections to the shutter
-control connections to the shutter

Which all reside in a confined mirror box? This is so with every DSLR, regardless of brand.

If you have no patience to wait for darkframe substraction, then that's your fault, not Nikons.

Visit my Nikonians gallery.

Visit my Nikonians gallery.

ThaQuest

US
4 posts

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#7. "RE: Long Exposure Purple Blooming" | In response to Reply # 6

ThaQuest Registered since 04th Aug 2006
Wed 09-Aug-06 01:19 PM

I'm not trying to cause any trouble, but Canon DSLR's do not have this problem. So apparently, this is not a problem with all DSLRs. Your logic doesn't hold up. If Canon can get it right, why can't Nikon?

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Daily Photos of China: http://www.xanga.com/jessewarren

Daily Photos of China: http://www.xanga.com/jessewarren

michael_tn

US
53 posts

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#8. "RE: Long Exposure Purple Blooming" | In response to Reply # 7

michael_tn Registered since 23rd Mar 2006
Wed 09-Aug-06 02:03 PM

doesn't canon use cmos and not cdd? perhaps there is a difference between the different sensors?

-- michael

G