Originally posted by dcshooter More for artistic reasons than anything else. The 43mm on 35mm film gives a useable focal length that is somewhere between the standard 50mm (long considered to be closest to what "the eye sees") and the traditional wide angle range beginning at 35mm and proceeding to 28mm, etc. As a result, it gives a rather uncomfortable field of view that falls somewhere between the two. It of course makes up for this in other ways (notably, superior image quality), but there is a reason that it is the only 43mm on the market.
There was a Nikkor Ai-P 45mm f/2.8 unti lrecently (manual focus only and that's a pancake). But well... this doesn't exactly challenge your statement so much, does it ?
Originally posted by dcshooter The formerly ubiquitous 135mm, usually seen at f/3.5, was previously dsigned and marketed primarily as a lightweight portrait lens, rather than a telephoto, and is not really the equivalent to the very few 200mms that you see today, the only examples of which I can think of are optimized as telephoto lenses, and as a result are large beasts, with 2.8 or wider apertures, fast focus, Optical stabilization etc. The Canon 200mm 2.8 is a 765g lens. The f/2 version is a whopping 2520g! The Pentax-F 135mm 2.8, by comparison, weighs a mere 395g and is substantially heavier than its predecessors. But still, Pentax users are not clamoring for it, despite its excellent image quality, since it is useless as a portrait lens on APS-C due to the long distance needed for good framing, and it does not have the handling characteristics suitable to a high-end telephoto which compensate for the short fixed reach it has. By comparison the Limited 50-135mm and and even DA 18-135 get you the same place without substantially reduced image quality and with better range versatility and better telephoto handling.
What about the FA135 ? Is it that different from the F ?
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Originally posted by ElJamoquio I love the 43mm focal length. The reason there aren't other 43's from other manufacturers is that we have five fingers on each hand. There's plenty of options at 40, 45... and even 50 isn't too far away. I like the 43 field of view better than 40 or 50 myself.
True but also, at the time (K series etc) the 50 and specially the 55mm almost looked like what we saw with our eyes because of the characteristics of the viewfinder.
My KX (not K-x) with 55/1.8 is exactly the proper magnification for me to frame with both eyes open.
Originally posted by ElJamoquio If you think the 18-135 has comparable image quality (at 135) to a 135 prime... I'd argue that the 135 prime doesn't have good IQ. YMMV.
Really? I remember the 135 was very highly regarded lens back then.
Or is its use on digital problematic ?