An 85mm lens on an APS-C digital camera roughly fills the roll of a
135mm lens on a 35mm film camera.
The traditional moderate telephoto focal length on 35mm film cameras was
a 135mm lens. Why 135? I suspect like a lot of things for historical
reasons. 135 was the "normal" focal length for a fairly popular group
of roll and sheet film cameras so good designs were available to be
adapted as starting points for 35mm cameras. If you look at most
telephoto lenses for 35mm, the traditional focal lengths seem to have
more to do with existing designs for other film formats than anything else.
On 5/17/2013 2:34 PM, Bipin Gupta wrote:
The focal length (77 to 85 mm, APS-C 116 to 128 mm) appears to be a
bit odd. Where would one use this focal length on an APS-C camera? I
understand the 50 mm serves well as a Portrait Lens at 75 mm on an
APS-C Body.
And I don't cover indoor sports, where these lenses may be useful -
based on shorter distances and lower lighting perhaps?
The Pentax version is very pricey too for amateur use.
I have read rave reviews on the Samyang 85/1.4, but put off buying one
which was on sale pre-owned at a pretty attractive price.
Regards.
Bipin.
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