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A deeper look inside Sony a7S…

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#26 mmalik

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Posted 29 January 2015 - 04:28 AM

Barebones..

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#27 mmalik

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Posted 29 January 2015 - 04:32 AM

Sensor mount.

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#28 mmalik

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Posted 29 January 2015 - 04:33 AM

Sensor mount..

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#29 mmalik

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Posted 29 January 2015 - 04:39 AM

Shutter.

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#30 mmalik

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Posted 29 January 2015 - 04:44 AM

Sensor Assembly.

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#31 mmalik

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Posted 29 January 2015 - 04:53 AM

Sensor board.

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#32 mmalik

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Posted 29 January 2015 - 04:55 AM

Sensor board..

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#33 mmalik

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Posted 29 January 2015 - 04:59 AM

LPF-1/Piezo.

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Edited by mmalik, 29 January 2015 - 05:02 AM.


#34 mmalik

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Posted 29 January 2015 - 05:03 AM

LPF-1/Piezo..

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#35 mmalik

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Posted 29 January 2015 - 05:06 AM

LPF-2.

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#36 mmalik

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Posted 29 January 2015 - 05:09 AM

LPF-2.. (Double Layered)

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Edited by mmalik, 29 January 2015 - 05:27 AM.


#37 mmalik

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Posted 29 January 2015 - 05:27 AM

a7S mod choices.

 

 

Note: Although LPF-2 on a7S is double-layered, exact nature and function of those layers (other than anti-aliasing) is not known at the time of this writing; manufacturer/technical references are welcome...

 

Source: Own rendering

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Edited by mmalik, 29 January 2015 - 05:36 AM.


#38 mmalik

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Posted 12 February 2015 - 11:11 PM

Pre and Post-mod look of a7S sensor; mod performed was 'Removed LPF-2'; stock LPF-1 is still in place. Tell the difference? Regards

 

 

FYI: The second, lesser greenish looking is the modified one...

 

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#39 sharkmelley

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Posted 30 April 2015 - 04:23 PM

I'll shortly be ready to DIY mod my A7S so these steps will be most helpful :)

 

I plan to perform a full spectrum mod and I also have a (home made) spectrometer so it will be possible to plot spectral response curves for those various layers to see what band pass each one has.

 

Mark



#40 mmalik

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Posted 30 April 2015 - 05:35 PM

Thanks Mark; a friendly advice I have (...should have mentioned at the outset) that a7S, for that matter, most Alphas are 'not' DIY kind of cameras! Look forward to your spectral analysis. Regards


Edited by mmalik, 30 April 2015 - 11:44 PM.


#41 sharkmelley

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Posted 02 May 2015 - 03:59 AM

I've modded a few Canons so I'm hoping the A7S will not be any more complicated.

 

Mark



#42 sharkmelley

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Posted 04 May 2015 - 07:37 AM

I modded the Sony A7S and it's still working! 

 

There are two internal filters, both of which I removed to make it full spectrum.  The first filter is clipped onto the sensor and is also used for the piezo dust removal.  The second filter is bonded to the sensor with some kind of sticky stuff.

The spectral responses can be deduced from these response curves produced from my home-made spectrograph (a long cardboard tube with a slit at one end and a diffraction grating + modded Canon 350D at the other)

 

spectrometer.jpg

 

SonyA7S_InternalFilters.JPG

 

Looking at those curves a good argument can be made for leaving Filter 1 in place because it seems to have a similar passband to a Baader IR/UV filter.

 

H-alpha has a wavelength of 656nm and the above chart suggests that modding the A7S has improved the H-alpha response by a factor of 5 or 6.  This was confirmed by some tests with an H-alpha filter that showed the mod has increased H-alpha sensitivity by a factor of 5.5

 

Mark


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#43 mmalik

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Posted 04 May 2015 - 08:34 AM

Looking at those curves a good argument can be made for leaving Filter 1 in place because it seems to have a similar passband to a Baader IR/UV filter..

 

Great analysis Mark; thanks!

 

 

I keep Filter-1 in place after the mod [...referred to as 'Removed Filter-2' mod]. Would you be able to share or PM the data that produced filter chart? Thanks in advance. Regards

 

 

Note: Visible spectrum and H-alpha line perspective of Mark's graph...

 

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Edited by mmalik, 04 May 2015 - 01:16 PM.

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#44 sharkmelley

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Posted 05 July 2015 - 06:14 AM

One problem I noticed with my modded Sony A7S (removal of both filters) is that a lot of my lenses no longer come to focus for objects at infinity - especially the older lenses with a "hard stop" at infinity.

 

So I've just taken it apart again to put a piece of Edmund Optics 3mm anti-reflective glass on the sensor.  This is very slightly thicker than the combined thickness of the filters removed (approx. 2.5mm) but it seems to have done the trick.

 

Mark



#45 mmalik

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Posted 05 July 2015 - 10:54 AM

Mark, could you have put LPF-1 back in (i.e., made it a 'Removed LPF-2' mod) and tested that way? Good info though for full-spectrum mod. Regards



#46 sharkmelley

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Posted 05 July 2015 - 11:57 AM

Mark, could you have put LPF-1 back in (i.e., made it a 'Removed LPF-2' mod) and tested that way? Good info though for full-spectrum mod. Regards

 

I did think about that but LPF-1 is the really thin one of the two filters.  I don't think it would have sufficient thickness.

 

Mark



#47 dvb

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Posted 05 July 2015 - 08:50 PM

A remarkable thread!  Thanks!  



#48 benjamindenantes

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Posted 03 October 2015 - 06:49 AM

Thanks for all these pictures.

 

I'm thinking of modifying myself my A7S. (LFP2)

Your picture are very usefull to see witch parts we have to remove to access the sensor.

 

Can you tell us about the most critical step? Any détails about what to take care of?

This task seem to be not so complicated for someone who knows how to use a screwdriver...

Am i wrong?

 

I think, i'll do this by myself because in France the price for this done by a professional is almost 500 $...


Edited by benjamindenantes, 03 October 2015 - 06:50 AM.


#49 t_image

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Posted 03 October 2015 - 10:31 AM

Bejamin, others thinking of it:

 

IMO spend some time learning more via google, having the best mental map of the terrain before you dive in will save a lot of headache.

Finding where all the screws are before the next step of removal will be one challenge.-some will hide under plastic or flexes!
I remember reading one teardown article published where they had a devil of a time finding a hidden screw that prevented them from progressing with the teardown for a while.
(mentioned in lensrental article and NEX5 video as well).

Flat (flex) cables:
IMO The biggest challenge you will face is the ribbon/flat cable removal.
Some have a locking mechanism and some a friction foot.

Sony was extremely efficient on utilizing space and minimizing material.
You'll need some other tools like special tweezers that help the gentle process of pulling the flat cables out, and then expect others to be almost hidden from view.
One video shows a guy using toothpicks.
Definitely you need to finess the flexes out, gently pull a little out at a time so that one side is not too far out compared with the other side. (I think I used 2 sets of insulated tweezers with curved head, one in each hand, but still had to wiggle gently!
The cable lengths will not spare much margin for error and I have seen some jokers tear them in process.The article mentions taking care to remove the sticky tape covering due to the flexes underneath that could tear!
Getting the layers off the sensor:
I can't remember now the exact issue of removing the layers from the sensor, but I remember watching one video of a guy that chipped the edge of the glass because he was using the wrong tool/method.
Screws:
I don't remember there being too many screws of different sizes to complicate the situation,(video says a7 has 29 total of 3 different sizes)
but taking a video or photos as you go and the discipline of making a map of where to return the parts/corresponding screws is a must!

I make a quick sketch on paper of the frame and tape each screw to the corresponding position. It's a muli-layer job so it'll take multiple papers and sketches from multiple sides!!

Or just number the screw on diagram and number the corresponding container section (buying a pill box with 29+ compartments or a plastic container with compartments will help you keep track of which is which)!

 

Oh, fun-just watched a fellow shock himself on (probably a high voltage capacitor discharge) from the built-in-flash circuit! (NEX 6 video).

Take care using conductive tools near the flash foot and elsewhere.

 

some quick examples of a search: (some of these were a great help to me before my venture!)

(so they aren't the a7s but the whole camera line NEX/a7 have a lot of the same construction and teardown issues).
parts showed, audio explanation very helpful:
https://www.youtube....h?v=ifRcIbfWzik

NEX-6 teardown video (same lessons can be learned):

https://www.youtube....h?v=D776GX3oSHQ

 

NEX-5 teardown video (same lessons can be learned):
https://www.youtube....h?v=dkrHCdp3E7k

article with a7r teardown explanation:
http://www.lensrenta...rrorless-camera

article of a7r2 teardown with another look/description
https://www.ifixit.c...Teardown/45597#

 

Also pay attention to the other forum (IS SONY ALPHA) where one mod was done that didn't heed the light baffles and left the sensor to pick up stray light from some IR sources inside the camera polluting his photos!!!

 

Happy modding!


Edited by t_image, 03 October 2015 - 10:34 AM.


#50 benjamindenantes

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Posted 03 October 2015 - 11:48 AM


Thanks for all these precious informations.

I have to say that i'm a mecanical enginner so i'm able to work with method.

I already mod a canon and it was an easy job with a good tutorial. ( thanks to garry Honis)

All the pictures here are very usefull to see where screws are located and i'm working to find them on the image before opening my camera.




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