Originally posted by glanglois Sorry, Falk, but it's at the end of a long day here. What is an "APS-C style lens"?
see below
Originally posted by jsherman999 Or a FF lens made with a smaller max aperture to reduce size/cost, basically giving up some of the FF advantage and 'matching' aps-c. Any f/4 zooms for example (24-70 f/4, 70-200 f/4)
Mosty what I meant, cf. below.
Thanks.
Originally posted by gazonk Question to those who may know: What is the most expensive lens to make: a high quality 16-50/f2.8 covering APS-C with good corner-to-corner quality, or a 24-70 f/4 with equally good FF coverage?
As I don't cease to say: FF is cheaper. I treat that topic in one of my papers.
Originally posted by Pål Jensen No it won't unless the former have a minimum aperture of F:32 which they usually don't....
The minimum aperture usually scales too. E.g., a 300mm may stop down to F32 while a 200mm may only stop down to F22 (as then both holes have same ~9mm size). But it's not a very relevant point beyond F22 anyway.
Originally posted by glanglois Of course, thanks. Now that I'm moderately awake, I'll cheerfully acknowledge that I should have known that.
No, I did
not mean the APSC image circle.
(AFAIK, such lenses are called APSC lenses
)
So, what are APSC-style lenses? These are lenses which are
popular with APSC cameras, with their properties translated to 35mm equivalent terms to make them independent of the sensor size.
E.g., the DA* 50-135/2.8 constant aperture zoom is the equivalent 70-200/4 APSC-style lens. It does exist for Canon FF or Olympus FT (35-100/2). Cheapest for FF, most expensive for crop 2. And Tokina is to bring the lens to Nikon FF.
Other examples would be an equivalent 22/5.6 pancake wide angle (DA15) etc. Or a 18-36/5.6 WA zoom (DA12-24). You get the idea...
At Nikon, I see a recent trend to launch APSC style lenses for FF.