Vivitar 90-230mm lens adapter help

[Rizzo115]

Hey friends,

Just recently aquired a vivitar 90-230mm l.4.5 auto lens. It has an adpater (maybe minolta) on it but I do not know how to take it off.

Pictures attached.

Thanks for the help.

 

[john.margetts]

If it is a T mount it will just unscrew. You don't show the mount in your pictures. Why do you think it is Minolta?

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[Rizzo115]

I saw a similar photo showing exactly what my pictures show and the person listed it as a mount. Just so I understand, my lens is 1 entire lens vivitar lens then, these are not 2 separate lenses/parts?

 

[dxqcanada2]

You really should take off that end cap ... and then show us a picture of the mount.

 

[Rizzo115]

My fault I'm not clear, to show you that picture, how do I take that end cap off? It seems stuck, no matter how I turn it. Any ideas on removing the cap?

 

[dxqcanada2]

Hmm, I agree with John ... it looks like a screw mount, so you could just unscrew it, though it might be very tight.

 

[Rizzo115]

Finally got it off.. how to determine what camera it fits?

 

[pendennis]

What you have is a Vivitar TX mount, similar to the earlier T4 mounts. You can use TX mounts on T4 cameras, but not the reverse. Here's a page which has the instructions for removing/mounting the TX adapter. I have several TX lenses which have variously, Pentax, Olympus, and Canon adapters. There's lots of non-relevant data on this page.

Popular Science

Notice that the f/stop dial numbers go in both directions, depending on the adapter fit. Nikon goes one way, others go the other. Without seeing the mount, I'm guessing that it's for Pentax (U - Universal) M42. You can find TX mounts for various camera makes on eBay. I've purchased a number of them there. Your lens was made by Tokina (1st two number of lens serial number (37) decodes to Tokina). If you search eBay, you can find them under Tokina's brand.

 

[Rizzo115]

Pendennis, thank you very much for detailed response.

 

[Derrel]

Perhaps the easiest way to determine what mount a lens is is to have a set of factory-logo-equipped rear lens caps... Nikon-F,Pentax-K,Minolta manual focus,Olympus OM,Canon FD, m42 thread mount, Yashica/Contax being perhaps the seven most-common mounts. When you go to some off the beaten path pawnshop and sort through the boxes of accumulated, cast-off 35mm legacy lenses, a quick test-fit of the lens caps can easily show what mount a store-branded lens actually "is"....without the need for a lot of expertise in lens mounts.

Pendennis and I agree on the thought that the lens's current mount or fitting is likely m42 thread, also called universal thread mount, sometimes called "Pentax screw-mount"...what makes me think that is the red-lettered "M" switch and the appearance of the rear cap: shallow...like so,so many m42 thread caps. The Auto-M stopdown switch was super-common on m42 lenses.

BTW, you have not, yet, shown us the actual rear mount fitting, only the inside of the lens where the T-adpater fits on...you need to show the rear-most part of the lens, the part under the rear lens cap...if we are to be absolutely positive of what it is. Try turning the rear lens cap counter-clockwise with your left hand with the lens placed front-element down on the desk.

 

[Rizzo115]

These are the last pictures I have of all angles of the lens. Not sure if you mean a piece screws off the end cap because I don't see where it would.

 

[Derrel]

The end cap comes off. The thing that caps the end. The cap. The rear lens cap comes off.

 

[Rizzo115]

I posted those 2 pictures on the feed above pendennis comment of the end cap being off. It doesn't fit on my minolta camera.

 

[dxqcanada2]

As others have mentioned ... your lens should have
rear plastic screw on cap + TX mount adapter + lens

It is that rear cap that needs to be unscrewed and shown to us ... and we most likely expect it to be an M42 screw mount ... which will not be compatible with a Minolta SLR film camera mount.

 

[Rizzo115]

Sorry if I'm not understanding but this is the only piece that comes off. The one with the cap attached.