Fuji STX models, are they Pentax K mount?

[daveish182]

Hi, I'm looking for cheap lenses for use on an *ist digital body (yet to be

bought) and came accross some Fuji STX fit lenses on ebay. I have a feeling

they are Pentax K mount but can't find any info on google. Anyone know?

Thanks

[davepearman]

No, Fuji STX (and AX) cameras used Fuji's own proprietary bayonet lens mount. It was quite sophisticated with auto exposure setting and electrical contacts, and superior in its time to Pentax KA. There were even adapters made to fit M42 screw lenses to the cameras, with auto diaphragm.

 

Unfortunately, it's not compatible with PK or any other fittings, and I don't know of any adapters for Fuji lenses to other mounts. Theoretically an adapter could be made for Olympus and Panasonic 4/3 cameras, but the market for this must be very small, which is why nobody has done it so far...

[walter_degroot]

unfortunately, many great cameras were made with odd lensmounts.

these cameras , when you find them, are really to be considered as fixed mount cameras, enjoy.

 

ricoh and chinon, at least either used m42 or the k mount.

 

there were variants on the m42 screw mount that might lock and cannot be unscrewed on normal m42 cameras!

 

I don't know the reasons for this but it creates " instant obsolescence"

[andyaitken]

Look for used Chinon and Rikenon (Ricoh) bayonet lenses - these are both K mount compatible. Also independent K mount lenses from Vivitar, Sigma, Tamron, Tokina, Miranda, Kiron etc. Having said that used Pentax K lenses are almost always better quality and pretty inexpensive.

[john_hill4]

Whatever you do dont just 'try' any unidentified K mount lens on a *ist body without carefully checking. Certain Ricoh, and possibly others, have an extra pin that will foul the body auto focus drive and possibly jam the lens on becoming almost impossible to remove without dismantling camera and/or lens. Whatever this pin does in its native environment the Pentax camera cant use it but once it is removed the lens can be safely mounted and operates normally.

[mawz]

The dangerous K mount lenses are Ricoh 'P' Lenses (And 3rd party lenses with that

capability). They are easily identified by the P setting on the aperture ring where the A would

be on KA and later lenses. The problem is the P indicator pin on these lenses is located where

the AF drive screw is on Pentax AF bodies, and mounting the lens will jam it on the body

semi-permanently.