TAKO. INTERNET SEIT 1996.
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 22:10:50 +0200
Thanks Jim, I'll give it a try as soon as I figure out what the Dutch
equivalent of emery paper is and where to get it ;-).

Frank


Op zo 11 aug. 2019 om 22:04 schreef Jim Nichols <jhnichols@xxxxxxxxxxxxx>:

> Frank,
>
>  From experiments, I found that about the thickness of a sheet of paper
> can make a difference.  My advice is polish a little, clean, reassemble,
> check, repeat.  I used a tree at about 300 ft as a test subject.
>
> Jim Nichols
> Tullahoma, TN USA
>
> On 8/11/2019 1:59 PM, Frank wrote:
> > 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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> >>
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