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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: Frank <wijsmuller@xxxxxxxxx>
Date: Sun, 11 Aug 2019 20:59:01 +0200
Jim,

thanks for your advice. Now I wonder how long you should move it until you
get some meaningful reduction in length?
As I understand it could be much less then a mm, but still.

My lens turbo works OK ish with lenses of 50mm and longer, but doesn't get
to infinity with shorter lenses.


Frank


Op zo 11 aug. 2019 om 17:27 schreef Jim Nichols <jhnichols@xxxxxxxxxxxxx>:

> Frank,
>
> Keeping the surface flat is not a big problem if you use thin emery
> paper and wrap it around a sheet of steel or aluminum, lay it on a flat
> table, and move the adapter part across the flat abrasive material.
>
> Jim Nichols
> Tullahoma, TN USA
>
> On 8/11/2019 9:54 AM, Frank wrote:
> > With these adapters, usually the bayonet fitting part (at the lens side)
> is
> > a separate chrome plated part attached with screws on the black tube.
> >
> > I guess you can sand the black tube a bit and reattach the chrome plated
> > part. However, keeping it perfectly flat could be a challange?
> >
> > Hmm..  now that I think about it, I have a slightly too long Lens Turbo
> > adapter myself which I could fix that way, maybe. Would the distance
> > between Lens Turbo elements and the sensor be less critical compared to
> the
> > elemens and the lens? Does anyone knows?
> >
> >
> > *Frank *
> >
> >
> > Op zo 11 aug. 2019 om 16:13 schreef Jim Nichols <jhnichols@xxxxxxxxxxxxx
> >:
> >
> >> 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.
> >>
> >> Won't work with a bayonet mount, though.
> >>
> >> Jim Nichols
> >> Tullahoma, TN USA
> >>
> >> On 8/11/2019 5:13 AM, Maggie wrote:
> >>> Hello all, Brian Swale here.
> >>> I've been trying various OM Zuiko lenses on my "new" A7, and the
> >>> results are rather mixed.
> >>> Firstly, I have come to the conclusion that the nice lens adapter I
> >>> bought has one significant secret flaw - it seems to 'not quite' allow
> >>> lenses to focus to infinity. Where I am shooting tests from ( our
> >>> bedroom balcony) in the distance at about 5 km (3 +- miles) are large
> >>> hills, and all the way back to the camera are intermediate targets.
> >>>
> >>> So, using the hot-focus indicator in the screen, those hills show as
> >>> being out of focus and the detail of the downloaded images also shows
> >>> that. So I need to buy another which is a pity as the build of the
> >>> adapter I have is otherwise very nice.
> >>>
> >>> Secondly, indications seem to be that only prime lenses will give a
> >>> sharp image. The 50/1.8 and the 100/2 are excellent. The jury is still
> >>> out on the others - I will try new tests with the camera on tripod
> >>> this coming week. I had thought that the 35-7-/3.6 excellent film zoom
> >>> would make a great versatile walk-around lens, but so far the images
> >>> disappoint. Similar for the 35-80 and the 35-105. The 75-150
> >>> disappointed. The 21, 24, 28, 40 and 85 need re-testing and I haven't
> >>> got to the 135 and 200 ( and larger) yet.
> >>>
> >>> We are still in winter with fresh snow on the hills to give some
> >>> contrasty details.
> >>>
> >>> Cheers, and back to lurk mode.  Brian
> >>>
> >>> ---
> >>> This email has been checked for viruses by Avast antivirus software.
> >>> https://www.avast.com/antivirus
> >> --
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> >>
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