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 p.18 #4 · Front-End Filter Improves Corner Smearing | |
Luvwine wrote:
What is it about the 28mm focal length that seems to make it challenging to get really good lenses? There are readily available 21mm lenses that are stellar and 35mm lenses that are great, but precious few great 28mm lenses. Is it a hard focal length to design for some reason? I like the Leica 28 lux a lot (tho not its price) on the Sony but even its MTF is hardly the equal of many lenses at wider and narrower focal lengths. The Otus is likely best, but it is a monster in size and also pricey.
DavidBM wrote:
Nothing about the focal length that's difficult.
I think it's just that it's whack in the middle of most mid range AND wide range zooms where they do well, so its a harder sell as a prime. People will pay for a standard prime like a 35 or 50, or an extreme focal length, or a longer one wher they value speed. But a 28 is a harder sell, and there are no modern premium ones except Otus (and the recent Leica that doesn't play well on Sony). Other than that there are premium but old designs (e.g. ZE) or new budget (FE or Nikon G).
I too hope for a Loxia,,.,
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Luvwine wrote:
The 28/2 Leica does not play well on Sony, but the 28/1.4 Leica does and it is a modern design and a "premium" lens...Agreed that a Loxia 28 would be a great addition.
DavidBM wrote:
Interesting, I hadn't seen that it plays well on Sony. Cool. But maybe it's not premium: it's ultra premium or luxury! If Lloyd Chambers is to be believed, it has worse colour correction than Otus. But that's not surprising given their relatives sizes, which is partly but not wholly explained by flange distance.
But I think what most of us hanging out for a premium 28 option are looking for is something a bit slower; f2-2.8 with an up to date design with no compromises stopped down and an excellent central area wide open. I for one would trade size for wide open corners, but the Astro crowd won't, so not everyone can win....
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Re: 28 Lux... I think this has been discussed elsewhere and IIRC, Luvwine and Steve Spencer like it on Sony. I have mixed feelings. I own it too, and have shot an infinity scene side by side on an a7RII and M240 and with simple center focus on infinity, the Sony results were clearly inferior to those on Leica. I didn't try focusing on the edges or somewhere halfway to see if a better across-frame sharpness balance might be possible. Also, these infinity performance concerns likely diminish at nearer focusing distances and for compositions where edge sharpness is not critical - i.e. environmental portraits, etc.
In Leica circles there are reports and some evidence (Reid Reviews) that the Lux does slightly better on the SL than the M240. Supposedly the SL has slightly thicker cover glass. My own shooting with the SL was before I got the Lux, but I was not happy with wide angle results using the 21/3.4 and 28 Cron v1 vs. how those lenses perform on the M240...
As for 28 Lux aberrations.. yes, standard CA, 'bokeh fringing' and purple fringing at wider apertures in high contrast transitions is evident. As with most Leica lenses, it's a mix of compromises to hit a certain target of size, speed, sharpness, character, etc. IMO, most Leica M lenses I've used and/or own exhibit some degree of CA whereas a few Zeiss ZM lenses I've owned were virtually free of CA.
Getting back to my original opinion that the 28 Lux underperforms on Sony at infinity, relative to Leica, it would be interesting to see if the PC lens would improve its results. That said, I'd be reluctant to try to re-shim the Lux for proper infinity focus on Sony...  A thinner adapter would have to be the solution.
What about the Sony FE 28/2...? I thought it was supposed to be a decent lens? But I guess MF is not so pleasant with it.
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