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Sony A7s - New Low-Light Camera - Wow!

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#26 nytecam

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Posted 14 April 2014 - 04:07 PM

So, is there a chance that the sensor will be available in a dedicated astro camera?

Bet someone with buy the camera, remove and rebody the sensor and add controlling s/ware although I understand some CMOS sensors can be a beast to reprogram :shocked:

#27 Moromete

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Posted 15 April 2014 - 02:12 AM

Some food for thought. Look at these high ISO shots taken with Sony A7S http://www.photograp...iso-comparison/ .

Does a Canon 6D user ( or anyone else) think that ISO12800-25600 of A7S is considerably cleaner than same ISOs of 6D?

Could be more than 1 stop difference between A7S and 6D at high ISOs?

#28 Relativist

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Posted 27 April 2014 - 11:36 AM

There are some ~4/3" sensor already used in astro cameras that likely meet our requirements of larger pixes, for example the KAI-04022 (7.4 µm in this case). Typically such cameras are upwards of $3-4k or more in cost.

I'm in agreement that it's a good sign that the megapixel trend isn't preventing manufacturers from producing chips capable of such low light performance.

#29 Relativist

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Posted 06 May 2014 - 03:34 PM

I've seen some rumors online about the price of the A7s that is still higher than the A7 but only by a few hundred, in addition there's a rumor that price will be announced on May, 7th. Anyone have more reliable news on an announcement date?

#30 chasing photons

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Posted 06 May 2014 - 04:46 PM

We should know the price on May, 7th and the rumors give a range of $1800 up to $5000. Just a few more hours and we might know. :choochoo:

#31 KJL

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Posted 06 May 2014 - 09:16 PM

I just saw the introduction of Mitakon's f/0.95 50mm (on pre-order for $799), full-frame coverage for E-mount cameras. Sounds like a match for the A7S and your IIE, Jay!

- KJ

#32 tim53

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Posted 10 May 2014 - 01:36 PM

Any word?

#33 Relativist

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Posted 10 May 2014 - 03:32 PM

Not any that I've seen. Hopefully it's out sometime soon.

#34 jdbastro

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Posted 10 May 2014 - 04:38 PM

Not any that I've seen. Hopefully it's out sometime soon.


One of the rumor sites said a price for the Sony A7s could be announced on May 15. Possible release date in July. But it's all just speculation.

#35 jdbastro

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Posted 15 May 2014 - 11:24 PM

Sony A7S price has been announced and its: $2500.

Not bad.

I just pre-ordered it. Can't wait.

BHPhoto Link

#36 mclewis1

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Posted 15 May 2014 - 11:40 PM

You know we're going to expect pictures ... yesterday ... :lol:

#37 Vondragonnoggin

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Posted 16 May 2014 - 06:25 AM

Is this one more sensitive (besides being color, not monochrome) than Photonis Nocturn? It's cheaper, that's for sure. Nocturn is around $4k and 100fps. Some specs here in this PDF

#38 RandyC

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Posted 16 May 2014 - 09:40 AM

Hi, It looks like an inch or larger sensor. How do you get the light to focus on such a large area? I assume you are planning on using it with a telescope?

#39 Moromete

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Posted 16 May 2014 - 02:26 PM

The A7S has a nice 12MP sensor for astrophoto but I suppose it will be a PITA to take 20 exposures of 5 minutes each due to the lack of a wired/software intervalometer. Also the battery is quite crapy.

#40 tim53

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Posted 16 May 2014 - 05:24 PM

I'd like to see this test repeated, but on a clear night and including some sky.

http://petapixel.com...low-light-de...

-Tim.

#41 SJTill

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Posted 16 May 2014 - 10:56 PM

Triggertrap supposedly has a dongle for Sony A7 coming, that works fine with my Olympus and iPhone.
$2500 is not bad for a full-frame mirrorless SLR with that kind of special capability.

#42 Relativist

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Posted 16 May 2014 - 11:45 PM

It looks like it's a few hundred more than the A7R. Looking forward to seeing what can be done, I'm wondering, how much more FOV would one get compared to a 1/2" chip?

#43 bwallan

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Posted 17 May 2014 - 06:27 AM

Is it possible to take more than 30s exposures in Bulb with any Sony A7 camera via USB+PC or WiFi+Android phone? If yes, how?

What software for PC or Android enables you these features?

Are Sony A7 cameras capable to take dark frames in the background like Canon 6D does?

If Sony A7s can't do these things, it's useless for astrophotography unfortunately even if it has an excelent sensor (this remains to be seen).


I've been using a Sony A7R for astro-photography for several months now AND am seriously considering the A7S. A few comments:

1) For longer than 30sec exposures you have both wired and IR remotes; however, I would suspect TriggerTrap will have the 1st reasonable remote-timer. To this point I have simply used 30sec exposures and a higher ISO.

2) Internal dark frames are a total waste of valuable imaging time! If you must apply darks, prepare a darks library and apply them in postproduction. I haven't used darks with either the Canon 60D or Sony A7R. I do, however, dither long exposures.

3) Regardless of its current shortcomings, the Sony A7R is very good at astrophotography and I believe the A7S will be phenomenal.

Recent astrophotography shot w/ Sony A7R in New Mexico: http://tinyurl.com/k6snyxe

Clear skies!

bwa

#44 JMKarian

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Posted 17 May 2014 - 07:04 AM

This camera has caught my eye.
I'm thinking of starting astroimaging, but am concerned that the specs on the A7s list that the operating temperature as 32*F and above.
Any thoughts?

John

#45 Relativist

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Posted 17 May 2014 - 07:26 PM

Brian, if I understand correctly the chip size is the same, so maybe you can help me understand the FOV vs something like a 1/2" chip commonly used for video work.

#46 Stew57

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Posted 18 May 2014 - 07:23 AM

You can install CCDcalc to compare FOV of various camera chips. Great program.

#47 bwallan

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Posted 18 May 2014 - 05:27 PM

Brian, if I understand correctly the chip size is the same, so maybe you can help me understand the FOV vs something like a 1/2" chip commonly used for video work.


Download and use CCD Calculator or take a look at: http://www.outbackph...s_01/essay.html

From the info on the link I would say the FOV of a full frame chip is about 5.4x the FOV of a 1/2 chip (based on chip diagonal).

bwa

#48 bwallan

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Posted 18 May 2014 - 05:34 PM

Brian, if I understand correctly the chip size is the same, so maybe you can help me understand the FOV vs something like a 1/2" chip commonly used for video work.

MallinCam Extreme 2 +
AT8IN + CGEM + Miloslick = WOW


A further note:

If the MallinCam Extreme 2 is currently your only "camera", you will also see an amazing improvement in image quality with something like the A7S (or even the A7R).

And I have owned two Mallincam cameras...

bwa

#49 bwallan

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Posted 18 May 2014 - 05:36 PM

This camera has caught my eye.
I'm thinking of starting astroimaging, but am concerned that the specs on the A7s list that the operating temperature as 32*F and above.
Any thoughts?

John


I've used the A7R for astro-imaging in conditions down to -30C (not unusual in an Alberta, Canada winter). It performed very well.

bwa

#50 RandyC

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Posted 18 May 2014 - 05:49 PM

I wouldn't say the A7r beat the Xtreme. The work I have seen on the A7r was 30sec x 30exp. That's an imaging application and not live viewing. If the A7s can achieve live video that can compare with the Xtreme, that will be impressive. The other issue is that it's CMOS which typically is not as rich in quality as CCD video.

I suppose you could just live with a wider fov that includes vignetting and crop it.






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