TAKO. INTERNET SEIT 1996.
Olympus-OM

Re: [OM] Just how sharp is the OM Zuiko 50/3.5 Macro?

Subject: Re: [OM] Just how sharp is the OM Zuiko 50/3.5 Macro?
From: DONALD HOLBROOK <donholbrook@xxxxxxxxxxx>
Date: Thu, 30 Apr 2020 18:55:56 -0400 (EDT)
 I enjoy the nattering.....keep it coming.

> On April 29, 2020 at 11:47 PM Moose <olymoose@xxxxxxxxx> wrote:
> 
> 
> Lovely image, Ken!!
> 
> On 4/29/2020 8:00 PM, Jim Nichols wrote:
> > Very nice sharpness, indeed. 
> 
> Yes, it's very sharp, but that's only part of its magic. It is very flat 
> field and, @ f8 about as good in the corners as 
> in the center. A really wonderful copy lens.
> 
> > How close does it focus?
> 
> Without extension tube, bellows, etc. it focuses to 1:2 = 0.5x. I have 
> several MF macro lenses. I did a careful test of 
> them @ 1:2 and 1:1 on the FF Canon 5D. In addition to the MF lenses, I 
> included a Tamron 90/2.8 AF lens.
> 
> The OM 50/3.5 was the winner @ 1:2, although only by a whisker. The Tamron 
> was very close. The Tamron focuses directly 
> to 1:1. Using a tube for the 50/3.5, it was good @ 1:1, but not as good as 
> the Tamron. I believe it is optimized for 1:2.
> 
> A really interesting thing is that, like a lot of newer lenses, and unlike 
> older designs, the Tamron was sharpest wide 
> open or @ f4, while the OM was best @ f8-f11. For some uses, other than 
> working with flat copy, the OM is better, giving 
> more DoF, while the Tammy works better in poor light.
> 
> I could natter on about MF macro lenses . . .
> 
> > On 4/29/20 9:37 PM, Ken Norton wrote:
> >> http://zone-10.com/d1/node/346
> >>
> >> One of the questions about the OM Zuiko series of lenses is whether or
> >> not the more common and affordable 50mm F3.5 Macro lens is sharp. I'm
> >> of the opinion that this lens is actually one of the sharpest lenses
> >> of any form in the OM Zuiko line.
> 
> Yup. I have two, just in case something bad happens to one.
> 
> >> <>
> >>
> >> Honestly, I don't really know how sharp the lens is as it had exceeded
> >> the resolving capability of any digital camera and film I've used.
> 
> It's not just sharpness, an undefined measure. Shooting a section of high 
> quality text, there are subtle differences in 
> edge qualities and subtle distortions. Some of the differences I saw between 
> lenses were things for which I didn't have 
> names. Rendition of the paper texture between characters also differs between 
> lenses.
> 
> So, yes, there were ways in which the image was not perfect @ 100% on a 13 MP 
> sensor. But amazingly good!
> 
> Same is true of many µ4/3 lenses. Using the HR Mode on an E-M5 II, it's clear 
> that they far out resolve any of the 
> existing 4/3 sensors. Shoot in HR, downsample to sensor size, and the images 
> are significantly better than a direct 
> shot. Most/much of this is elimination of the resolution loss of Bayer arrays.
> 
> Close Up Moose
> -- 
> What if the Hokey Pokey *IS* what it's all about?
> -- 
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