[Leica] KolariVision Astro-photography cover glass, Sony a7r, Leica glass

[RicCarter]

awesome!


ric


> On Jul 12, 2016, at 1:51 PM, Paul Roark <roark.paul at gmail.com> wrote:
> 
> I used this converted Sony a7r with M glass at this year's Golden Trout
> Workshops.  My initial observations remain that it is a very interesting
> alternative platform for the Leica M glass.  I took up the WATE and the
> Zeiss 50mm ZM.
> 
> This is a color shot that those who were up there really seem to appreciate:
> 
> http://www.paulroark.com/Campfire-MilkyWay-GoldenTroutCamp.jpg
> 
> It is two WATE 18mm frames at f/4 stitched in PS-CC on "automatic."
> Between the 18mm at f/4 and the distortions of the merging, there is a
> reduction of quality at the corners.  However, this has to be in the
> context of a 30 second exposure at 3200 iso (4 sec. for the center of the
> campfire).  The north star is not in this one, but would be above and to
> the left.  That is why there is less of an arc there.
> 
> Paul
> www.PaulRoark.com
> 
> On Sat, Jun 11, 2016 at 3:49 PM, Paul Roark <roark.paul at gmail.com> wrote:
> 
>> I had the older Sony converted and have posted the first comparison shot
>> on page 2 of my PDF on this project.  See
>> http://www.paulroark.com/BW-Info/KolariVision-Astro-BW.pdf
>> 
>> "Tech Pan's" extended red sensitivity comes to digital, including color.
>> 
>> The Astro filter is thinner than the OEM filter.  Leica M wides work quite
>> well at f/8, but still have a bit of un-sharpness wider.
>> 
>> The WATE plus the astro filter may be quite a landscape combo.
>> 
>> The astro cover glass is very incompatible with the Zeiss Loxia 21mm made
>> for the Sony.  The advantages of optics designed for the specific cover
>> glass characteristics are obvious, and not much glass is, in my view,
>> likely to be made any other way going forward.
>> 
>> The thinness of the astro cover glass was a surprise.  It shot down my
>> hope of using the Loxia and it's very good f/2.8.  However, with the WATE
>> (and other Leica glass at f/8) the old Sony may be very interesting.
>> 
>> (I'll probably post this on the Yahoo Digital B&W print forum also.)
>> 
>> Paul
>> www.PaulRoark.com
>> 
> 
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