Actually it's the /true/ normal lens on an APS-C sized sensor or film
for that matter, the diagonal of the sensor is 28.8mm, (assuming the
perfect measurements, which every manufacture fudges, of 16x24mm).
Barnack picked ~50mm lenses as normal for his camera design using 35mm
film for either manufacturing reasons or because he liked longer lenses,
I've heard both stories, and the rest is history, On a side note;
Another story is that he simply used a double frame of the then normal
movie format. However there were also a lot of cameras making 2 1/4 x 3
1/4 which is roughly the same aspect ratio, which is also pretty close
to the aspect ration of 1:1.618,. the Golden Mean.
What were we talking about again?
On 1/28/2011 10:01 AM, Darren Addy wrote:
28mm lenses are plentiful so there are a lot of choices out there for
the Pentax shooter. On an APS-C camera, as we all know, the 28mm give
the (35mm) equiv. of a 42mm lens, making it a nice
slightly-wider-than-normal lens. Most do not offer the speed and
corresponding low-light capabilities of the "nifty fifties" but they
give you a corresponding equiv. of 75mm on an APS-C camera. The 35mm
f2.0 is probably the concensus favorite for a normal APS-C lens, and I
liked mine but sold it to pay for a whole kit of legendary and cult
classic manual focus glass in a Minolta mount, which was too good a
deal to not take advantage of. I will probably own the F/FA 35mm f2.0
again, but one cannot deny that a manual focus 28mm is going to cost a
small fraction of that lens.
I just obtained a Pentax-A 28mm f2.8 and it appears to be a very good
copy. I was, frankly, very impressed with the reviews and images found
here:
http://www.pentaxforums.com/lensreviews/SMC-Pentax-A-28mm-F2.8-Lens.html
So I now have at least the following three lenses that I plan on comparing:
S-M-C Takumar 28mm f3.5
Pentax-A 28mm f2.8
Tamron 28mm f2.5 (PKA Adaptall)
I may also have a "no name" 28mm to throw in to compare. Don't know if
anyone is interested in seeing the results, but I'll post a link when
I have it.
--
Where's the Kaboom? There was supposed to be an Earth-shattering Kaboom!
--Marvin the Martian.
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