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Olympus-OM

Re: [OM] Zuiko manual lens options for Sony A7

Subject: Re: [OM] Zuiko manual lens options for Sony A7
From: Wayne Shumaker <om3ti@xxxxxxxx>
Date: Tue, 13 Aug 2019 17:48:19 -0700
Perhaps an unfair test, but couldn't resist. OM 50/1.8 vs Zeiss 55/1.8 @ 1.8.

First test with late series OM 50/1.8 with Fotasy adapter on a7riii, shot wide 
open, compared to Sony Zeiss 55/1.8, also manually focused the same way. This 
was highly rated 50 on Gary Reese's testing. I have a second OM 50 and should 
check it as well.

Based only on this one test I have to say the Zeiss way out performs the OM 
50/1.8 in sharpness and contrast. The OM 50 has a soft look too it, almost a 
fuzzy glow. Here are two 100% crops. The OM subject was more centered, the 
Zeiss shot subject was off to the right. This is not a super controlled test, 
and perhaps higher F stop would help the OM. I really like the Zeiss 55. That 
and the Sony 90 macro is nice and handles well, easily switching from AF to MF 
by pushing the focus ring forward...

OM 50/1.8 100% cropped
https://www.dropbox.com/s/p690qd1gxba2f01/7R301920_crop2.jpg?dl=0

Zeiss 55/1.8 100% cropped
https://www.dropbox.com/s/0ehikvsgwmyppip/7R301924_crop2.jpg?dl=0

I don't regret the $14 for this test. It has satisfied an a long time itch.

dxomark rates the 55/1.8 lens well:
https://www.dxomark.com/Lenses/Sony/Sony-FE-Carl-Zeiss-Sonnar-T-STAR-55mm-F18-mounted-on-Sony-A7R-II__1035


WayneS

At 8/13/2019 01:47 PM, you wrote:
>On a Moose enabled whim I bought the Fotasy OM adapter for Sony. For $14 it 
>was low risk investment. With 50/1.8 OM it appears infinity is just as Moose 
>claims.
>
>Also with focus peaking and focus magnifier on C1, it is easy to work with. 
>Now to figure out setting IBIS focal length for best operation - somewhere in 
>the menus under SteadyShot settings.
>
>WayneS
>
>
>At 8/12/2019 02:28 AM, you wrote:
>
>>On 8/11/2019 7:13 AM, Jim Nichols wrote:
>>>Brian,
>>
>>>I ran into a situation like that with one of my first adapters, where the 
>>>adapter was just too thick to allow me to get to infinity.  This was a 
>>>threaded adapter, and I simply polished the surface with emery paper on a 
>>>flat surface until I got it right.
>>
>>The third party folks don't always get it right, although you'd think they 
>>would get the basic stuff right. I bought a Beschoi Pro OM=>Sony E adapter.
>>
>>I'd been using a combo of  combo of OM=>EOS and EOS=>E, which is fine at 
>>infinity. I think I wanted the OM=>EOS for something else, so I bought the 
>>direct  OM=>Sony E.
>>
>>As I was intending to do some astrophotography, I wanted to be able to simple 
>>focus to the stop for infinity. So I checked. All the OM lenses I tried 
>>focused to infinity before the marking and stop! Compared it to the OM=>EOS 
>>and EOS=>E I'd used before, it's 0.3mm shorter!
>>
>>Bought a Fotasy adapter, same length as the combo, infinity just as it should 
>>be, and returned the Beschoi Pro.
>>
>>So, Brian, if you don't want to try to shorten it yourself, Fotasy is another 
>>brand that works.
>>
>>On 8/11/2019 6:38 AM, Frank wrote:
>>>In my experience the A7 is capable of very sharp results with all MF
>>>lenses, including zooms. Actually better then ever on a dslr.
>>
>>My experience, as well, but I've not shot wider than 28 mm on the A7. MikeG 
>>comments on problems with wider lenses, due to the depth of the sensor stack, 
>>I think.
>>
>>>However, you cannot trust 'focus peaking', but instead you need to magnify
>>>the viewfinder image to get best results. It can be set to the C1 button,
>>>allowing for an easy workflow.
>>
>>I do just that for Magnify. OTOH, I've found focus peaking to work well, as 
>>well. Magnify, if on a tripod, peaking, if hand held, has worked for me.
>>
>>
>>Right Height Moose
>>
>>-- 
>>What if the Hokey Pokey *IS* what it's all about?
>>-- 
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