Bob, Thanks for taking time to look at the photos & thanks for your
generous remarks on my photography. Oh I did shoot film, slides mostly
and developed and printed my own. I was shooting a Ricoh with pentax
mount lenses because I could not afford the real thing. 90% with that
Sears branded 50mm and & 10% with cheap telephoto. No wide angle. My
1st real digital was Pentax 200D.
This little experiment was to see which lenses would carry over to
Pentax FF and if not, it does not bode well for the success of Pentax
FF. If as you say (I I do not dispute) the buyer needs to buy new higher
quality and higher priced glass the why go Pentax? Just go Canikon!
Unless the Pentax is so inexpensive it lessens the blow of new lenses.
Sony has the merit of smaller sized cameras for FF. But it turns out
that fast FF lenses are rather large. The A7 & a 35mm lens weighs 3 lbs
and ain't pocketable. Advantage Olympus for size & weight. back to
Canikon for lens selection.
If I were to go Sony their 35mm ($1500) and 50mm ($1000) are among the
sharpest lenses ever tested. Money no object it is still a big
commitment. Many people on the web are raving about using Leica glass on
the A7 but we all know those are pricy too. And all adapted lenses are
manual exposure & focus. Except for Canon lenses which work as native on
Sony with a $3000 dollar adapter. I would keep Pentax cameras & some
lenses for sports, birds, if nothing else for the reach of the teles. &
my K01 with a pancake or even the 18-135 is a fun kit for the casual
walkabout.
Thanks again for giving me all this food for thought.
On 12/30/15 5:28 PM, [email protected] wrote:
n 30 Dec 2015, at 21:19, Donald Guthrie <[email protected]> wrote:
>
>As rumors of a Full Frame camera are getting closer to fruition, I wondered how my
pentax mount glass would work. Borrow Lenses offered me 17 days for a 7 day rental
price over the holidays. So I rented a Sony A7II. My full frame lens collection
consisted of Pentax 28mm, 28-70 & 70-200 Tamrons, a 50mm Pentax 42 screw mount
Sears labeled 50mm, A Tokina 70 to 200, a Sigma 28mm and Rokinon 14 mm. These photos
are the results of my shooting. I did not take notes on which lenses I used for the
pix and of course the exif is no help. If there is a specific one of the above lenses
you want me to test, let me know and I will post that one. Most are non or slightly
cropped except the one of all colored glass which is maybe a 90-100% crop. Used a $15
adaptor. I had no Sony native lenses to use.
>
>My general impression of FF is nice bokeh and low noise even even after
pulling the shadows up from black. The biggest surprise for me was how wide a 28mm
is and how short a 200 mm is.
I guess from that that you've only ever shot digital!
>
>Here are the links to two sets; would be happy to get your opinion on the
photos and to answer any questions you might have.
>
>
>http://adobe.ly/1TqeEeb
>
>And a second one on an afternoon in a Botanical Center with butterflys &
Plants. .
>
>http://adobe.ly/1MyGuit
>
They're nice photos, well composed and well lit.
When I moved from film to digital I had a very high quality Contax / Zeiss film
kit. Using the lenses with an adapter on Olympus 4/3rds gear I noticed very
significant purple fringing with some of the lenses, which meant they were
effectively useless for digital, so I sold all the Contax / Zeiss stuff.
So the first thing I looked for on your shots was purple fringing because I
think (could be wrong) that it results from the different alignment of pixels
and film wrt the light path, and subsequent interference between pixels. I
didn't notice any in the shots of yours that I looked at. What I did notice is
that at full magnification your shots are softer than the quality of your
photography deserves. You don't say specifically which models of lenses you
use, but I suspect the softness is in the glass, not including the fullness of
the frame.
You should try and get hold of two or three equivalent focal length Sony lenses
and shoot comparisons with your lenses under controlled conditions, as best you
can.
Your pictures deserve better lenses. Go for quality rather than quantity.
B
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