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Old 05-02-2015, 10:27 PM
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alocky (Andrew lockwood)
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A nikon d810a ??

If true, I'm afraid I will just have to do what it takes!

http://petapixel.com/2015/02/04/spec...eportedly-way/
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Old 05-02-2015, 10:39 PM
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Yes I read a similar rumour.

The D800e I had was great for this sort of shot. It had very slight amp glow but it did not really show up in nightscapes or long exposures.

An astro version might need to address some non linear aspects of the D800 which apparently made it hard to do a flat field/dark subtract.

I have not done a flat fielding with one myself only what someone else reported.

Greg.
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Old 05-02-2015, 11:00 PM
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killswitch (Edison)
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The D810 was recalled for awful thermal noise soon after release. The way they 'fix' it sounds half assed. I dont think its gonna do well for AP in its current form.

http://www.nikonusa.com/en/Service-A...ikon-D810.html
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Old 05-02-2015, 11:16 PM
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alocky (Andrew lockwood)
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Quote:
Originally Posted by gregbradley View Post
Yes I read a similar rumour.

The D800e I had was great for this sort of shot. It had very slight amp glow but it did not really show up in nightscapes or long exposures.

An astro version might need to address some non linear aspects of the D800 which apparently made it hard to do a flat field/dark subtract.

I have not done a flat fielding with one myself only what someone else reported.

Greg.
I do flats, darks and bias with mine - no complaints at all. Results seem all right to me?
www.astrobin.com/users/alocky

Hadn't heard about the poor noise performance of the 810. Shame.
Cheers,
Andrew
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Old 06-02-2015, 11:13 AM
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My D800e performed well with regards to thermal noise. I wonder what they changed. Same sensor.

My Sony A7r has a different noise pattern to my old D800e even though its the same sensor. Its more of a wormy pattern as opposed to a more even grain with the D800e. Still extremely clean but also the ISO seems brighter for the same number compared to the Nikon D800e which may have been slightly inflating its ISO.

ISO6400 on the Sony is noticeably brighter than same lens/exposures on D800e.

Greg.
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Old 06-02-2015, 11:29 AM
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killswitch (Edison)
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https://cdn.photographylife.com/wp-c...oise-Issue.jpg

I dont understand how they screwed it up either, but even after a service to apparently fix it, it can still be worse than a D800.

"after this service some noise (bright spots) may still be noticeable in exposures longer than 30 s than they were in images captured by previous cameras with the same exposure time"

Nikons been releasing a lot of duds lately. Id wait 3-6 months before jumping on a new Nikon model. Let the reviewers put them through the paces first.
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Old 06-02-2015, 12:00 PM
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Nikon has been a bit unreliable. Even the D750 which is a widely acclaimed camera has a flare issue.

Then most high end cameras have their little issues. D600 was the worst with the dust. D800/e had the green LCD and left hand focus issues,
A7 has the sensor reflections in bright lights in night shots, the A7r a light leak, the Fuji XT1 minor light leak and weak D pad buttons.

Canon has done pretty well during the same period. A minor 5D3 light leak.

Greg.
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Old 07-02-2015, 01:48 PM
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Perhaps someone should tell nikon that the Df would be a better camera to turn into an AP special.
Still, I was considering modifying an 800 so the 810a still appeals to me.
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Old 10-02-2015, 12:31 PM
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More on the Nikon 810A


http://nikonrumors.com/
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Old 10-02-2015, 01:30 PM
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I like the shutter speed up to 15 minutes. I can never understand why virtually every camera is limited to 30 seconds and then this silly "bulb mode".

I guess astro work is a minority interest.

Greg.
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Old 10-02-2015, 04:13 PM
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I just got the email from Nikon today.
If only I didn't already have a standard D800

Although at $4,000 launch price. Is there any benefit of the nikon over an astro cam?
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Old 10-02-2015, 04:23 PM
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http://www.nikon.com/news/2015/0210_dslr_01.htm

It's official, with samples.
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Old 10-02-2015, 04:41 PM
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For $4000+, would be nice if they added a red mode/filter for the back & top LCD's and even the viewfinder. Also change the buffer LED to faint red instead of green.

Last edited by killswitch; 10-02-2015 at 05:08 PM.
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Old 10-02-2015, 05:14 PM
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http://www.dpreview.com/articles/578...ography-camera

I didn't see any samples from that official site, was there another link?

It seems very good.

Is it worth it over a standard D800 modified?

Dark subtract sounds good but if that means an equal exposure every time it would be useless but if it meant 1 autodark which is subtracted from each light thereafter like an SBIG then that would be good.

I wonder how it would fair against a modified Sony A7s?

I liked my D800e for nightscapes, it really performed well.

Greg.
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Old 10-02-2015, 11:48 PM
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hmmm, interesting - i too like the extended 'bulb mode' seriously, you should be able to enter as many seconds as you like by now - its 2015. but that is a step in the right direction. good call on the dark subtraction too Greg.

it feels like it would be better for nightscapes rather than attaching to a scope?

I wonder if then it can compete with a CDS-A7s or a CDS-6d which are about $1k cheaper.
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Old 11-02-2015, 02:47 AM
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Well, the extended bulb mode is not needed when one uses a remote such as the PIXEL 252 cable release with timed bulb shots or an Android app such as DSLR Dashboard.
I use the Canon counterpart (6d) with DSLR controller on my Android with red screen enabled.
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Old 11-02-2015, 07:35 AM
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More info and some videos of the camera and pics it has taken .

http://nikonrumors.com/
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Old 11-02-2015, 08:41 PM
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Quote:
Originally Posted by hobbit View Post
Although at $4,000 launch price. Is there any benefit of the nikon over an astro cam?
I can't see why anyone would even consider it at that price. You could buy two Atik 314L+'s for that!
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Old 12-02-2015, 12:08 PM
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It could be quite good as after all its full frame. An 11002 chipped astro cam starts at about US$5000 so...

Here is a shot I took a couple of years ago 2 x 60 minutes Nikon D800e with 14-24mm lens at F2.8 ISO400 (it also has some narrowband material added from my FLI Proline camera but the guts of the image is the Nikon).

http://www.pbase.com/gregbradley/image/152348475/large

36mp full frame in telescope shots is probably not ideal. STL 11 is only 11mp full frame so Sony A7s modded and cooled at 12mp large pixels with deep wells should be better. D800e wells though are quite deep. From memory they are about 45,000 electrons which is pretty decent. 36mp would probably suit a widefield telescope like an FSQ106ED or similar.

But at $4000 there are a number of astro cams it would compete with. The APSc Canon astro DSLRs were much cheaper and thus a viable alternative to dedicated astro CCD cameras.


Greg.
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Old 12-02-2015, 06:21 PM
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Quote:
Originally Posted by gregbradley View Post
But at $4000 there are a number of astro cams it would compete with.
I'm just not sure why anyone would choose to pay that much for something they'd either have to get a cooling mod done on (thus voiding your warranty), or suffer from nasty noise issues.

Maybe there's some advantages that I can't think of, but I'll take a purpose-built, cooled, mono CCD over that any day, especially for $4k.
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