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Sony A7s - New Low-Light Camera - Wow!

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#551 Relativist

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Posted 21 October 2014 - 01:29 AM

Those are stunningly good Brian. I can't wait to get my hands on one of these cameras. I'd be interested to see what stacks of 10 and 20 instead of 30 would look like in comparison.



#552 bwallan

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Posted 21 October 2014 - 01:56 AM

Those are stunningly good Brian. I can't wait to get my hands on one of these cameras. I'd be interested to see what stacks of 10 and 20 instead of 30 would look like in comparison.

From 5x30 sec. @ ISO 1600:

M31-Clr35mm-PI-5subs-1.jpg

 

You can click between the 30 sub and 5 sub image as images #3 and #4 in the album:

Full A7S Weekend Album

I can't really see a great deal of difference.  The 30 sub image has slightly more definition of faint dust lanes, slightly brighter nebulosity, etc. BUT not a whole lot of extra "stuff"...  Theoretically the signal-to-noise ratio of the two images should be 5.5x vs. 2.23x, so you should be able to see a fair bit less noise and better signal in the 30 sub image.  However, the noise level in an ISO 1600 image off the A7S is already so low maybe this doesn't apply??

 

Enjoy!

bwa

 

P.S.:  Even a single sub from this session is pretty reasonable.


Edited by bwallan, 21 October 2014 - 02:08 AM.


#553 bwallan

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Posted 22 October 2014 - 02:32 PM

I spent a little time under the stars last night testing the Sony 28-70mm zoom (the A7 kit lens) on astrophotography with a full spectrum A7S.  My conclusion:  I like it!  Good stars to the edge of the image, i.e.: no stretching, no coma.  Not terrible vignetting, although it does have some.  The image below is one of 1st three images I've added to the album noted below the image:

Sony%2B28-70mm-2.jpg

 

Full Spectrum A7S Testing & Playing Album  My favorite is probably M45.

 

Enjoy!

 

bwa


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#554 RandyC

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Posted 28 October 2014 - 08:58 AM

Before the clouds rolled in, I got this one of M33. EAA at ISO 2500 - 3200 seems to be a nice gain. Exposure here was 261sec at ISO 2500 using noise reduction. The HEUIB-II filter was the key on the modded camera, letting Auto WB work, although nebulae seem a tad too red. Galaxies are great. Adding an LP filter on top of the HEUIB-II throws off the AutoWB. Only post processing was Fotor Scene "Portrait".

 

Warm week coming up which is a good thing.

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#555 bwallan

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Posted 28 October 2014 - 12:13 PM

Before the clouds rolled in, I got this one of M33. EAA at ISO 2500 - 3200 seems to be a nice gain. Exposure here was 261sec at ISO 2500 using noise reduction. The HEUIB-II filter was the key on the modded camera, letting Auto WB work, although nebulae seem a tad too red. Galaxies are great. Adding an LP filter on top of the HEUIB-II throws off the AutoWB. Only post processing was Fotor Scene "Portrait".

 

Warm week coming up which is a good thing.

Great shot!

 

bwa



#556 bwallan

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Posted 28 October 2014 - 12:21 PM

Shot a session on the Milky Way last night before the clouds closed in.  A mosaic of three single JPG images:

MW-3%2Bimages-1.jpg

Samyang 14mm @ f/2.8, Kolari Hot Mirror filter, full spectrum Sony A7S, tripod,
3x15sec @ ISO3200, mosaic in Autopano Giga, postprocessed in Lightroom, 33% of full scale

Larger Image

 

Enjoy!

 

bwa


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#557 mclewis1

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Posted Yesterday, 12:07 PM

Only post processing was Fotor Scene "Portrait".

Randy,

 

When you've mentioned using Fotor in other images you've posted is it also the "Portrait" scene setting that you've used?



#558 RandyC

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Posted Yesterday, 12:22 PM

Yes, that was all that is done. The BionZ image processing and noise reduction is so perfect, if you adjust it much, you lose detail. I could add contrast to this image but lose the fainter outer galactic arms. The higher the ISO, you get more skyglow, so you have to use more contrast. You can do an ISO 400k image of M33 in 5 seconds but it's not very good. I could probably do even better going below ISO 2500 to say 5 minutes, but 4 minutes is about good for me. Then it takes the camera about 3 minutes to process the image. So you're looking at 7 minutes total.



#559 Relativist

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Posted Yesterday, 12:56 PM

If you get a chance, can you show us the 400k with 5 seconds, and then maybe a stack of 10 the 5 second exposures? Also, any progress getting DSS to work with Sony cameras?



#560 bwallan

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Posted Yesterday, 01:41 PM

Yes, that was all that is done. The BionZ image processing and noise reduction is so perfect, if you adjust it much, you lose detail. I could add contrast to this image but lose the fainter outer galactic arms. The higher the ISO, you get more skyglow, so you have to use more contrast. You can do an ISO 400k image of M33 in 5 seconds but it's not very good. I could probably do even better going below ISO 2500 to say 5 minutes, but 4 minutes is about good for me. Then it takes the camera about 3 minutes to process the image. So you're looking at 7 minutes total.

What settings are you using that it takes the camera 3 minutes to process the image?  Are you talking about Long Exposure Noise Reduction?

 

bwa



#561 bwallan

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Posted Yesterday, 01:47 PM

M1 shot under terrible cloud conditions, to the extent the last 15 subs were totally unusable and the remainder were probably captured through thin cloud/haze:

M1-PI-PMfused-1.jpg

M1 - 2014Oct28

Astro-Tech 8" RC, Televue 0.8x reducer, Hutech HEUIB-II filter, full spectrum Sony A7S, EQ6Pro mount, unguided, no in-camera noise reduction,
30x30sec @ ISO6400,
15 subs aligned and stacked in PixInsight, postprocessed in Photoshop & Lightroom, full scale



#562 RandyC

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Posted Yesterday, 03:23 PM

Single Sub, Very Fine mode, Style Clear, Contrast +3, Both NR on 








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