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Apprentice
Posts: 5
Registered: ‎04-26-2017
Message 51 of 111 (577 Views)

Re: star-eater algorithm in Bulb-mode shots - please offer alternative

I have been a Nikon user all my life, but I bought my first Sony Mirrorless a couple of years ago - a used A7r - to try it out and decide whether I want to make the switch.  I was completely sold and looking to sell all my Nikon gear and upgrade to the newest A9 until I read about this.  It is unacceptable for me.  Will the new A9 also be saddled with this algorithm?  If so, it is enough to change my mind about the switch to Sony.  There should be an option to disable the algorithm when taking star shots.

Enthusiast
Posts: 3
Registered: ‎04-22-2017
Message 52 of 111 (519 Views)

Re: star-eater algorithm in Bulb-mode shots - please offer alternative

Well, despite all of this, I still wound up buying an a7rii the other day.  My daughter has been selected to lay a wreath at the tomb of the unknowns in DC next week and I wanted a really nice camera.  Adorama has great deals on exchanges and I can get a chunk of money back if the a7siii comes out in the next 180 days.

 

I used a Metabones adapter to connect the a7rii to my Canon t-ring on my telescope and got nothing but terrible pictures.  Everything was jittery and blurry.  I am assuming it is because I did not turn image stabilization off. I went out to try again tonight and before I could get the system connected clouds rolled in.

Specialist
Posts: 16
Registered: ‎04-17-2017
Message 53 of 111 (483 Views)

Re: star-eater algorithm in Bulb-mode shots - please offer alternative

A7R2 has smaller pixels than A7S2, so depending on your scope configuration, if your scope is long focal lenght and long f/D, the star can be spread on more than two pixels, and star eater could be not too bad. also if your camera has the old firmware, you will not suffer the 3.2s limit but just the 30s limit

 

the worst configuration is definitely A7S2 with short focal lenght and fast optics that give star smaller than pixel size. SINCE I UPDATED THE FIRMWARE, I CANNOT USE IT ANYMORE FOR STAR SCAPE PHOTOGRAPHY, it is unable to capture stars with my sharp sigma 20mm f/1.4, my 14mm f/2.8, my 35mm f/1.4 etc...

 

at this point, WE MUST HEAR FROM SONY, PLEASE ANSWER IF:

 

- Problem is taken into account and we can expect it to be solved

- Problem will not be solved but sony can provide us with a way to get old firmware back on camera

- Problem will not be solved and since sony has our money, they don't care of customer support and will not do anything for us

 

 

Specialist
Posts: 22
Registered: ‎01-19-2017
Message 54 of 111 (467 Views)

Re: star-eater algorithm in Bulb-mode shots - please offer alternative

Unfortunately, Spoutnicko, I think that its very clear that there will be no reply from AnthonyCS or anyone else in Sony, given that it seems that we have had (at the beginning of this thread) our one bland assurance that Sony listens to its end-users (yeah, right!). i even went so far as to contact them directly outside the thread, and did not even get the courtesy of a reply. In the face of this silence, I think that there are two things we can do:

 

First, we need to keep raising this issue in this and other forums to make the wider Sony A7 community aware of the alterations that Sony are applying to raw files once exposures exceed 3.2 seconds. If we do this there might be some hope of getting them to address the issue in the same way that they made available 'uncompressed' raw, provided that there is enough pressure from enough end-users;

 

Second, I've been exploring how much I can get around the 3.2 second limit by stacking to combine multiple shots (A7RII), mostly using DeepSkyStacker. Results are partially encouraging, although its clear that 30 2-second exposures don't capture as much signal as done gets say from combining ten 6-second exposures, because the individual short exposures just don't get enough signal from faint objects, even when they are combined. And of course, the 6-second exposures carry the penalty of Sony's star-eater algorithm which effectively destroys the faint signals from small objects. And as you point out, this may be less useful for you with your A7S2 given your larger pixel size. I'm intending to write this up in my blog, and will share the link once I publish it - and rest assured that I will publicise it more widely on other forums as well!

 

Keep up the struggle folks!

 

-John

ADF Apprentice
Apprentice
Posts: 8
Registered: ‎04-18-2017
Message 55 of 111 (405 Views)

Re: star-eater algorithm in Bulb-mode shots - please offer alternative

What would be really helpful is if one of the top photography vloggers does something on it, that would surely get massive widespread exposure of the problem

Specialist
Posts: 22
Registered: ‎01-19-2017
Message 56 of 111 (402 Views)

Re: star-eater algorithm in Bulb-mode shots - please offer alternative

Or if we could catch the attention of one of the major blog sites such as FredMiranda...

Apprentice
Posts: 12
Registered: ‎04-16-2017
Message 57 of 111 (383 Views)

Re: star-eater algorithm in Bulb-mode shots - please offer alternative

Navmanzz and I created a (private) facebook-group called 'star eater community'. Please join us over there to discuss our strategy on how to address this issue. PM me if you can't find the group or are having problems otherwise. 

Enthusiast
Posts: 7
Registered: ‎08-22-2015
Message 58 of 111 (364 Views)

Re: star-eater algorithm in Bulb-mode shots - please offer alternative

Yes, Sony, please address this issue present on my a7S and other bodies which makes this otherwise desirable camera useless for astrometry !   LISTEN TO THE USERS SONY !

Apprentice
Posts: 2
Registered: ‎12-06-2016
Message 59 of 111 (340 Views)

Re: private face book group

[ Edited ]

Navmanzz and I created a (private) facebook-group called 'star eater community'.

And that is a *private* group because...?

Apprentice
Posts: 12
Registered: ‎04-16-2017
Message 60 of 111 (332 Views)

Re: private face book group

It's private because I intend to discuss our strategy on how to tackle this issue over there. As long as you're not a Sony employee, feel free to join ;-)

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