Re: Official: 7artisans 50mm f/1.05 APO Lens for Sony E
Jman13 wrote: Fred Miranda wrote: Jman13 wrote:
I've got to be honest - those look pretty good. Obviously, it's not APO in the least (lots of longitudinal CA), but the rendering is quite lovely, and it looks to be at least reasonably sharp wide open. It's not going to cut glass, but an f/1 lens for under $500 - we all knew that wasn't happening anyway.
Wonder how it compares with the TTArtisans 50mm f/0.95.
Well controlled LoCA for such fast lens though.
Perhaps, but certainly nowhere near APO. The samples are definitely impressive. If they have reasonable quality control (the only 7Artisans lens I've used I had one terrible one and then one OK one in return), it is a steal for $500.
It’s hard to tell from samples if something is APO.
Certainly genuinely apochromatic lenses can and sometimes do have quite a bit of visible LoCA; it depends not just of three frequencies being in focus in the same plane, but on exactly which they are, as there are still deviations outside those three (three out of continuum many!). The point is just that an APO lens might have good LoCA control, because the other frequencies may not deviate much if three are bang on. But they don’t always.
OK you might say “my APO I don’t mean apochromatic, instead I mean the great performance that all the lenses marked APO have”. But there are plenty of lenses marked APO that are no better than this in LoCA control, including a couple from a famous boutique marque.
Oct 29, 2020 at 04:31 PM
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