Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
05-09-2019, 02:55 PM   #1
Forum Member
Dale H. Cook's Avatar

Join Date: Mar 2019
Posts: 87
RMC Tokina 75-260mm w/ Canon Mount - Chances of Finding a Donor K Mount?

There doesn't seem to have been much discussion of this lens here in recent years. I have one in very good condition (actually the Sears rebranded version) that I inherited from my late father. I've seen some interesting comments here and elsewhere about using it in close focus (aka macro) mode, and am interested in experimenting with it. The problem is that Dad had a Canon AE-1 so the lens has an FD mount.

This lens was available from Tokina (and Sears, and possibly Vivitar or others) with a variety of mounts including K mount. Two questions:

1) Has anyone successfully replaced a Tokina mount for a different camera with a K mount?
2) What are the chances of finding a non-functional Tokina lens with a K mount that I can swap onto this lens in place of the FD mount?

Although my fine motor skills are not quite what they were even a decade ago they are still pretty good, and I still have a large collection of jeweller's tools (not many of us have 0-80, 1-72, and 2-58 dies and taps). Since I am retired I have lots of time to play with and little money, so if I can swap mounts it is a task that I am not averse to.

05-09-2019, 04:44 PM   #2
Loyal Site Supporter
Loyal Site Supporter
boriscleto's Avatar

Join Date: Dec 2009
Location: North Syracuse, NY
Photos: Gallery
Posts: 15,570
Is it a fixed lens mount? Because Tokina made that lens with the TX mount...maybe T4 too...

Last edited by boriscleto; 05-10-2019 at 09:47 AM.
05-10-2019, 05:57 AM   #3
Forum Member
Dale H. Cook's Avatar

Join Date: Mar 2019
Posts: 87
Original Poster
I'm not sure what is meant by a "fixed lens mount." Is that a mount that is (more or less) permanently attached to the lens, as opposed to one that, say, can easily be removed by hand? This one appears to be attached by three small machine screws, maybe 2-58, maybe smaller.
05-10-2019, 07:33 AM   #4
Moderator
Not a Number's Avatar

Join Date: Mar 2012
Location: Venice, CA
Posts: 7,758
Your chances of finding a working copy in K-mount are probably greater than finding a broken donor copy.

If you look at the service/parts diagrams for Kiron lenses it's not a simple matter of just changing the rear mount - you have to change the entire diaphragm assembly as well. For one thing placement of the linkages are different and second the setting for min to max apertures are reversed between FD and K-mount.

Page 6

Kino Precision (Kiron) lenses were sold under many brand names including Vivitar.

05-10-2019, 09:58 AM   #5
Loyal Site Supporter
Loyal Site Supporter
boriscleto's Avatar

Join Date: Dec 2009
Location: North Syracuse, NY
Photos: Gallery
Posts: 15,570
Just searching eBay you can find many 75-260/4.5 lenses sold by many resellers. Vivitar, Soligor, Sears etc. I'm pretty sure they were all made by Tokina. Frankly it's not worth trying to convert from one mount to another. There are 2 Soligor, 1 Sears, and 1 Asanuma currently on eBay for less than $40, all in PK mount.

The lens was sold in TX mount by Vivitar, and probably in T4 by Soligor. These were universal lens mounts and could be adapted to many different lens mounts with the proper adapter. TX had a PK mount adapter, but T4 only had a M42 adapter. There is a TX mount Vivitar listed on eBay for like $35, but the shipping from Japan is also $35...
05-10-2019, 10:29 AM   #6
Junior Member




Join Date: Nov 2017
Posts: 25
Look for a lever next to the mount labeled O-L (open-lock). Tokina had a system designed to allow the mounts to be changed called T4 and then updated to the TX system. If you're lucky you can just unlock the Canon mount and exchange it for a K or M42 mount. Otherwise, the internal mechanisms are different and would not allow the change from Canon to Pentax. I don't have first hand experience but I have heard Nikon is close enough to allow the mount to be changed but the flange distance is different so it requires adding spacers to keep focus at infinity.
05-10-2019, 01:36 PM   #7
Forum Member
Dale H. Cook's Avatar

Join Date: Mar 2019
Posts: 87
Original Poster
QuoteOriginally posted by Riggson Quote
Look for a lever next to the mount labeled O-L (open-lock).
I don't have that so it looks like this lens is stuck with the Canon mount.

It looks like my best bet for experimenting with this lens is to buy one with a K mount and sell this one. I may just sell it and save up for a late-model macro lens for my K-70.
05-11-2019, 10:03 AM   #8
Junior Member




Join Date: Nov 2017
Posts: 25
QuoteOriginally posted by Dale H. Cook Quote
I don't have that so it looks like this lens is stuck with the Canon mount.
It appears that way. This is what the previous posters referred to as a fixed mount.
QuoteOriginally posted by Dale H. Cook Quote
It looks like my best bet for experimenting with this lens is to buy one with a K mount and sell this one. I may just sell it and save up for a late-model macro lens for my K-70.
Don't expect too much as the lens isn't particularly valuable. I see them on shopgoodwill regularly with a starting point of $10. There's one listed now with a Nikon F mount at that point with no bids yet. My copy is from Vivitar and I gave $8 for it.
On the other hand the close focus series lenses generally get good reviews so they tend to perform better than the price might lead one to expect.

Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
75-260mm w/ canon, canon, canon mount chances, chances, fd, k-mount, lens, pentax lens, rmc tokina 75-260mm, slr lens, swap, tokina, tokina 75-260mm w/
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Vivitar 75-260mm autofocus lens info please. Dewman Pentax SLR Lens Discussion 6 07-22-2014 06:08 PM
Question about Porst 75-260mm F4.5 Macro f. Pentax K BNBPhoto Pentax SLR Lens Discussion 5 04-02-2012 01:36 AM
RMC Tokina 70-210mm F3.5 is the same as Tokina Vivitar Series I 70-210mm ? minahasa Pentax SLR Lens Discussion 11 09-17-2011 09:59 AM
Does anyone know the history of the Sears 75-260mm f/4.5 close focus lens? Sagitta Pentax SLR Lens Discussion 7 06-22-2011 09:48 PM



All times are GMT -7. The time now is 10:58 PM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top