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PhotonsToPhotos Seeks Your Help

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bclaff View Drop Down
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Post Options Post Options   Quote bclaff Quote  Post ReplyReply Direct Link To This Post Topic: PhotonsToPhotos Seeks Your Help
    Posted: 07 December 2017 at 20:01
I perform sensor measurements at PhotonsToPhotos best known for Photographic Dynamic Range (PDR)
I rely on others to help in collecting the required raw files for analysis and find that I'm missing a couple of Sony A-mount full frame (and other) cameras.

In particular I'm looking for the: A900 and A850

So if you are willing to help out please get in touch.
Email is easier for me to track but Private Message is fine too.
 



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bclaff View Drop Down
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Post Options Post Options   Quote bclaff Quote  Post ReplyReply Direct Link To This Post Posted: 08 December 2017 at 05:00
I should have mentioned that email from me tends to go to spam if you're using gmail.
So if you have emailed me and you're on gmail, check your spam folder
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Miranda F View Drop Down
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 08 December 2017 at 09:19
Are you looking for any particular kind of images?

I have the A900 (v2 firmware). I usually take jpegs but I can do you some raws if you like.
Miranda F & Sensorex, Sony A58, 5d, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras . . .
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Post Options Post Options   Quote lonewolf Quote  Post ReplyReply Direct Link To This Post Posted: 08 December 2017 at 09:47
Bill replied - will need to be current owners so ex-owners like me need not apply :)

Edited by lonewolf - 08 December 2017 at 10:17
a7rii+A6000 | Tamron 70-300 USD,24-70 USD 90mm macro | Sigma 35mm ART, Sony28/55/ 85mm| Plus lots of Nikon stuff

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bclaff View Drop Down
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Post Options Post Options   Quote bclaff Quote  Post ReplyReply Direct Link To This Post Posted: 08 December 2017 at 10:16
Originally posted by Miranda F Miranda F wrote:

Are you looking for any particular kind of images?

Yes, they are very specific raw images that get fed into my test software.
Originally posted by Miranda F Miranda F wrote:


I have the A900 (v2 firmware). I usually take jpegs but I can do you some raws if you like.

I think I'm already working on the A900 with someone.
Is your equipment list correct? I think you have some other cameras that would be of interest; like the A58.
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bclaff View Drop Down
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Post Options Post Options   Quote bclaff Quote  Post ReplyReply Direct Link To This Post Posted: 08 December 2017 at 10:17
Originally posted by lonewolf lonewolf wrote:

will shoot you an email for the D850

Perhaps you meant A850.
If you really meant D850 then I can report that I only lack data for 2 Nikon models; the D3400 and the D5600.
 



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stiuskr View Drop Down
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Post Options Post Options   Quote stiuskr Quote  Post ReplyReply Direct Link To This Post Posted: 08 December 2017 at 12:29
Originally posted by bclaff bclaff wrote:

Originally posted by Miranda F Miranda F wrote:

...I have the A900 (v2 firmware). I usually take jpegs but I can do you some raws if you like.

I think I'm already working on the A900 with someone.
..


So you only need one RAW file from one body? There's no advantage to having submissions from various a900's for sample variation?
Rob Suits Jr.
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bclaff View Drop Down
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Post Options Post Options   Quote bclaff Quote  Post ReplyReply Direct Link To This Post Posted: 08 December 2017 at 13:31
Originally posted by stiuskr stiuskr wrote:

Originally posted by bclaff bclaff wrote:

Originally posted by Miranda F Miranda F wrote:

...I have the A900 (v2 firmware). I usually take jpegs but I can do you some raws if you like.

I think I'm already working on the A900 with someone.
..


So you only need one RAW file from one body? There's no advantage to having submissions from various a900's for sample variation?

It's several raw files per body.
I haven't found much sample variation in doing this about 10 years but extra data is sometimes helpful.
So if you want to contribute go ahead and send me an email.
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 08 December 2017 at 13:41
Originally posted by bclaff bclaff wrote:

I haven't found much sample variation in doing this about 10 years but extra data is sometimes helpful.

That's interesting. It seemed to me like sensor and supporting circuits might vary quite a bit.

I also wonder how much the lens used matters. I choose the Minolta AF 100mm F2.8 RS Macro this time with the files I sent you because it had the mildest corner shading at f/4 I could find.
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bclaff View Drop Down
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Post Options Post Options   Quote bclaff Quote  Post ReplyReply Direct Link To This Post Posted: 08 December 2017 at 14:41
Originally posted by QuietOC QuietOC wrote:

Originally posted by bclaff bclaff wrote:

I haven't found much sample variation in doing this about 10 years but extra data is sometimes helpful.

That's interesting. It seemed to me like sensor and supporting circuits might vary quite a bit.

That's quite rare. I think the last time I encountered that was with the Nikon D3. It has 12-channel parallel readout and sometimes the channels weren't correctly balanced. People with unbalanced channels did get satisfaction from Nikon after I documented their problem.
Originally posted by QuietOC QuietOC wrote:

I also wonder how much the lens used matters. I choose the Minolta AF 100mm F2.8 RS Macro this time with the files I sent you because it had the mildest corner shading at f/4 I could find.

Lens doesn't matter but strong fall-off can have an effect on the Fixed Pattern Noise (FPN) test.
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Post Options Post Options   Quote lonewolf Quote  Post ReplyReply Direct Link To This Post Posted: 08 December 2017 at 14:54
Originally posted by bclaff bclaff wrote:

Originally posted by lonewolf lonewolf wrote:

will shoot you an email for the D850

Perhaps you meant A850.
If you really meant D850 then I can report that I only lack data for 2 Nikon models; the D3400 and the D5600.


LOL apologies, too much shooting with Nikon!
a7rii+A6000 | Tamron 70-300 USD,24-70 USD 90mm macro | Sigma 35mm ART, Sony28/55/ 85mm| Plus lots of Nikon stuff

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bclaff View Drop Down
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Post Options Post Options   Quote bclaff Quote  Post ReplyReply Direct Link To This Post Posted: 08 December 2017 at 15:50
Originally posted by bclaff bclaff wrote:

...
In particular I'm looking for the: A900 and A850
...

A850 results have been published.
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Miranda F View Drop Down
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 09 December 2017 at 09:18
Originally posted by bclaff bclaff wrote:

I think I'm already working on the A900 with someone.
Is your equipment list correct? I think you have some other cameras that would be of interest; like the A58.


I have the A58 and a Minolta 5D as well. Guess you aren't interested in the film cameras. I have lots of those ...

Tell me what images you want from which cameras and I'll oblige.
Miranda F & Sensorex, Sony A58, 5d, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras . . .
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bclaff View Drop Down
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Post Options Post Options   Quote bclaff Quote  Post ReplyReply Direct Link To This Post Posted: 09 December 2017 at 13:35
Originally posted by Miranda F Miranda F wrote:

Originally posted by bclaff bclaff wrote:

I think I'm already working on the A900 with someone.
Is your equipment list correct? I think you have some other cameras that would be of interest; like the A58.


I have the A58 and a Minolta 5D as well. Guess you aren't interested in the film cameras. I have lots of those ...

Tell me what images you want from which cameras and I'll oblige.

I recently got Konica Minolta Maxxum 5D measurements from another Dyxum member but would love to get the A58.
I will send you a Private Message shortly.
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