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Re: [Digital BW] OT -- KolariVision Astro-photography cover glass, Sony a7rii

Re: [Digital BW] OT -- KolariVision Astro-photography cover glass, Sony a7rii

2016-12-21 by Paul Roark

This updates my efforts to get the best B&W digital image capture (all things considered and for my preferences, of course). I continue to believe the extended red sensitivity offered by the astro-photography cover glass conversion, which replicates the old Tech Pan spectral sensitivity, results in a superior B&W camera.

(My original post on the original astro cover glass was on June 11, 2016, at https://groups.yahoo.com/neo/groups/DigitalBlackandWhiteThePrint/conversations/messages/109150 )

I have now had my Sony a7rii converted by KolariVision using a cover glass that matches the OEM Sony glass thickness. Thus, while the original conversion used a thinner cover glass that was good for Leica M lenses, it did not work for Sony/Zeiss lenses made for the Sony platform and thicker cover glass. The new, thicker astro-glass conversion does work with the Sony & Zeiss glass.

See http://www.paulroark.com/BW-Info/KolariVision-Astro-BW.pdf for a summary of my documentation of this experience.

If you do the type of landscape photography that benefits from a dramatic sky, then this appears to be a major step above the stock solutions. I will report my experiences with this setup in the above PDF, with major findings noted here.

Happy Holidays to those who have some type of solstice celebration.

Paul
www.PaulRoark.com

RE: [Digital BW] OT -- KolariVision Astro-photography cover glass, Sony a7rii

2016-12-22 by Nigel Richards

Hi,

I do most of my landscape work with self-converted infrared cameras, currently Panasonic Micro 4/3 with 720nm internal filters. I found this to my taste for a couple of years but suspect that I now prefer a slightly less strong effect, you can have too many images where it looks like you have a heavy frost. I have used 600nm to good effect, not sure about the false colour effects many like but it does give a less strong IR effect in monochrome.  The most flexible conversion I have done was with an Olympus E-PM1 where I removed the IR cut filter completely  and used my choice of filter on the lens.  I do move the sensor forward as far as I can and the camera focuses to infinity with several of the Olympus lenses such as the standard kit zoom but not the Panasonics.   

Cheers

Nigel in the UK

http://www.nigelrichards.org.uk/More%20Infrared%20Images.htm  (taken with a 720nm, dramatic skies but the frost look on the ground)
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From: DigitalBlackandWhiteThePrint@yahoogroups.com [mailto:DigitalBlackandWhiteThePrint@yahoogroups.com] 
Sent: 21 December 2016 22:50
To: DigitalB&WPrint
Subject: Re: [Digital BW] OT -- KolariVision Astro-photography cover glass, Sony a7rii

 

  

This updates my efforts to get the best B&W digital image capture (all things considered and for my preferences, of course).  I continue to believe the extended red sensitivity offered by the astro-photography cover glass conversion, which replicates the old Tech Pan spectral sensitivity, results in a superior B&W camera.

 

(My original post on the original astro cover glass was on June 11, 2016,  at https://groups.yahoo.com/neo/groups/DigitalBlackandWhiteThePrint/conversations/messages/109150 )

 

I have now had my Sony a7rii converted by KolariVision using a cover glass that matches the OEM Sony glass thickness.  Thus, while the original conversion used a thinner cover glass that was good for Leica M lenses, it did not work for Sony/Zeiss lenses made for the Sony platform and thicker cover glass.  The new, thicker astro-glass conversion does work with the Sony & Zeiss glass.

 

See http://www.paulroark.com/BW-Info/KolariVision-Astro-BW.pdf for a summary of my documentation of this experience. 

 

If you do the type of landscape photography that benefits from a dramatic sky, then this appears to be a major step above the stock solutions.  I will report my experiences with this setup in the above PDF, with major findings noted here.

 

Happy Holidays to those who have some type of solstice celebration.

 

Paul

www.PaulRoark.com

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