Astro photography with M9 and Noctilux 0.95

[jaapv]

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The M9 definitely WILL NOT take a photo longer than 250 seconds. At that length of time, you still get star streaks, however, just short ones and on a moonlight night, some interesting effects. Perhaps Leica can fix this in a firmware update, though I suspect it may have something to do with the sensor heating up. For good star streaks, you need a 12-20 minute exposure.

You'll never get longer exposure times on a largish CCD unless you start cooling it with liquid nitrogen, like they do on telescopes. For this use a CMos system is far more suited.

[swamiji]

You'll never get longer exposure times on a largish CCD unless you start cooling it with liquid nitrogen, like they do on telescopes. For this use a CMos system is far more suited.

 

An alternative, would be to use a Noctilux 0.95 with a M7.

[jaapv]

Well, yes, but as you are working on a tripod and from a fixed location, a medium format camera would be the better choice imo.

[swamiji]

Well, yes, but as you are working on a tripod and from a fixed location, a medium format camera would be the better choice imo.

 

Well then you need to get your self a decent telescope (how about Palomar) as well?

[jaapv]

:D

[Alnitak]

This is one of the areas where digital far exceeds the capabilities of film. The linear response of a digital sensor is perfect for this kind of work, and that's why the CCD is so important in scientific applications. The problem of cooling is an issue and there are amateur systems that use pelter cold fingers to cool the CCD, to avoid the requirement for liquid nitrogen or the like. To that end, Jaap is right in that in an uncooled system, the CMOS sensors work much better due to the more sophisticated per-pixel noise suppression systems.

 

Film was lousy for astrophotography. Anyone remember reciprocity failure?

 

Jeff

[AlanG]

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You'll never get longer exposure times on a largish CCD unless you start cooling it with liquid nitrogen, like they do on telescopes. For this use a CMos system is far more suited.

 

I don't know how Phase One cools their CCD chips or what else they may be doing but some of their backs can expose for up to one hour.

 

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[Alnitak]

I believe that Phase One uses some form of active cooling.

[gravastar]

...................Film was lousy for astrophotography. Anyone remember reciprocity failure?

 

Jeff

 

......... and baking the film in forming gas .

 

 

Bob.

[elansprint72]

Hello everyone,

 

...........................I can probably make use of this kit for astrological photography as well......................

 

 

Thanks in advance and once again, thanks for such a nice community.

 

 

Let's get this thread back on track.

 

Astrology - Wikipedia, the free encyclopedia

 

[faraz]

Currently waiting for Astrotrac equipment to ship from UK (delivery estimate is end of next week or thereabouts). Expecting slightly better luck with the summilux 21mm, I will update this thread once I get my hands on astrotrac.