replace Vivitar 55mm 2.8 OM mount

[kiddo]

Hi everyone, I've bought this lens some days ago and would like to change the mount to adapt it to sony.
Currently I've never used OM mount and would not want to buy an adapter to carry it with me only for this lens, a Nikon mount would fit me better for example.
So I've found this adapter that supposedly replaces one mount for another and ut works the infinity. Do you guys have any idea if ut would really work or should I look for another option? I do have the OM to EOS adapter fitted to the lens.

[visualopsins]

Edited: OP was edited after my original reply. LOL

[eggplant]

[kiddo]

I'm using Sony mirrorless and my interest is to avoid buying/holding for an adapter that I would only use on this particular lens.
I have no clue about this lens design (including mount ring) if replacing the mount it is just straight by removing screws , in some cases ,OM lenses would include part of the diaphragm mechanism with the mount ring.

[dickb]

[kiddo]

Thanks for your input, it's hard to see these lenses go for 60€ nowadays (not saying impossible?) and F mount is more demanded I guess.
I'll allow me few more days to decide , my first issue is to avoid to carry another adapter with me , sometimes ,on hiking , that's very important.

[BrianSVP]

Just adding this info for anyone interested in attempting something similar in the future:

The Vivitar lenses of that era (mostly Kirons and Komines both "regular" and S1), have mounts specific to the lens models and are completely different in size and screw position from those on OEM lenses. They are semi-modular in that usually, portions ahead of the aperture ring are reused from one brand's mount to another, typically with two main variants, depending on whether the aperture closing lever moves clockwise or counterclockwise on the target mount.

The apertures themselves sometimes are constructed so they can be rotated into different positions while being assembled to accommodate different mounts, with the positions sometimes marked with the initial of each brand marking the position in which it should be inserted.

The long and short of it is that if you have a donor lens from a mount with a lever that moves the right way, you can sometimes do a transplant, but it may involve re-shimming and/or adjusting the infinity stop to have accurate focus, and it's typically way more trouble than it's worth.

[ZuikosHexanonsandVivitars]

[eggplant]

Now I've not disassembled enough to determine a pattern, nor looked for a pattern, nor am a repair person, nor do I repair lenses much-

but some lenses have their aperture lever 'ends' I suppose you could call them attached via screws, so can be removed.

On a separate level you could also count easily removed and accessible aperture lever 'assemblies'.

Most recent one which counts as wholly easy was Makinon 28-80mm f3.5 in PK mount.


Let's not forget the first part, though - any baffle at the rear of the lens. Often held by set screws on side of bayonet, or in some cases just glued on (Praktica P/B lenses), or perhaps rarely attached to the rear side of the mount. This'll be something you lose with a bayonet with different rear construction on, unless it's just the right diameter to be glued in or something.

[dickb]

[BrianSVP]

[dickb]

[dickb]

BTW, for the replacement mount to work easily, you need the screw holes to line up with those of the lens. Looking at an ebay auction for the OM-Vivitar 55/2.8 there are 3 screws, like the original Olympus mounts. The arrangement of those three screws seems different though for the Vivitar and the Olympus lenses. On the Vivitar the screws seem evenly spaced, creating an equilateral triangle, on Olympus lenses the triangle isn't equilateral, I measure the distances between the centre of the screws as 49.8, 44.3 and 43.5mm. If your Vivitar doesn't match these numbers, you will at least need to drill new holes in the replacement mount.

For the rest, the Vivitar OM mount looks close to identical to Olympus ones. I have no way of telling how thick the body of the mount is, so you may need shimming or sanding to match infity focus. All the moving aperture parts seem not to interfere with the mount, apart from the two original buttons on the side. You don't need those anyway as the lens will be manual aperture only and the lens release button is on the camera side for Nikon F mount.