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Canon RF 24-240mm f4-6.3 IS USM coming soon
#63
(09-09-2019, 09:47 PM)Klaus Wrote:  Many FF lenses have a great center performance and dismal borders - combined with sky high price tags. I just don't want to bother. Needless to say there's also the size/weight advantage. While in theory, FF lenses of similar "equivalent" speed could be as small, they just don't exist so that debate is purely hypothetical. Where is the FF equivalent lens of the Leica 100-400mm or Olympus 300mm f/4 IS for instance?
Conversely, you can ask how many people really buy something like a FF 85mm f/1.4? 0.1% of the FF users? 0.5%? For the vast majority it'll remains a lens illustrated in a catalog. No more.

The really relevant question isn't equivalence. It is whether you need more than MFT. I do not believe that 80% of photographers need more than MFT. Of course, everybody is free to buy whatever they want.

So as always, all things in the universe have their place and there is a place for MFT as there is one for FF. There's even one for APS-C, too. ;-)
The "dismal" borders are a result of higher sample rate (higher resolution sensor lens tests) and your simple sharpening step for the MTF chart images, which gives the smaller  format test borders a boost and the FF borders a kick, mostly. 
Like I pointed out at the beginning of this thread, you compared the manufacturer MTF curves of the Oly 12-100mm f4 and the RF 24-240mm f4-6.3 IS USM, but both are "wide open", and that Oly is equivalent to a 24-200mm f8 lens. I bet that the corners of this 24-240mm are pretty close to what that Oly does.

There is no that small aperture equivalent for the lenses you mention, just as there are no smaller sensor format equivalents for FF tele lenses either. Use the tool that offers what you need.

Your question of how many FF shooting people buy a 85mm f1.4... Most FF shooters have one or more of the following lenses: 70-200mm f4, 70-200mm f2.8, 85mm f1.8 (or yes, f1.4 or f1.2), 50mm f1.4, 35mm f2 or f1.4 (or now f1.2), 24mm f1.8 or f1.4, 16-35mm f2.8, 135mm f2 or f1.8, 500mm f4, 200mm f2.

So, most FF shooters have at least one lens which has little or no equivalent for smaller sensor platforms.

Like I said before, use the tool you need.
  


Messages In This Thread
RE: Canon RF 24-240mm f4-6.3 IS USM coming soon - by miro - 07-05-2019, 07:35 AM
RE: Canon RF 24-240mm f4-6.3 IS USM coming soon - by davidmanze - 09-09-2019, 07:25 AM
RE: Canon RF 24-240mm f4-6.3 IS USM coming soon - by davidmanze - 09-09-2019, 10:26 AM
RE: Canon RF 24-240mm f4-6.3 IS USM coming soon - by Brightcolours - 09-10-2019, 10:37 AM

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