Interchangeable Lenses

Discussion in 'Darkroom Developing and Printing' started by Rex the Strange, Sep 19, 2005.

  1. Hey all,

    I just bought, via eBay, a camera which I thought would have the same
    lens mount as the one I already own (so I wouldn't need to buy new
    lenses). Unfortunately not. Although it is also a Fujica, like my
    current camera, it is an earlier model and has the M42 mount instead of
    the x-fujinon mount that my current AX-3 has. Major pisser. Does anyone
    know of a source for a lens mount adapter so that I can use my
    x-fujinon lenses on my M42 mount camera? I'm keeping an eye on eBay and
    I'm pretty sure such an animal does exist. Does anyone know of a dealer
    that may specialise or, at least, carry Fujica stuff?

    Rex the Strange, Sep 19, 2005
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  2. Rex the Strange

    Bob Salomon Guest

    No there isn't. While it is easy to go from a screw mount to a bayonet
    mount and maintain infinity focus going from a bayonet to a screw mount
    adds thickness and eliminates the ability to focus to infinity.
    Bob Salomon, Sep 19, 2005
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  3. Rex the Strange

    Rod Smith Guest

    I don't know if such a beast exists. I just checked B&H
    (, and they've got an adapter to go the other
    way -- to mount M42 screw-mount lenses on Fujica X-mount bodies:

    Judging by the photo, it looks as if the X-mount opening is much wider
    than the M42 opening, and it may have a slightly shorter film/flange
    distance. If so, you probably won't be able to get an X-mount lens to fit
    where it needs to fit to focus properly on an M42 body via an adapter.
    Thus, any adapter will either function as an extension tube or will
    require optics to compensate. If the latter, the optics will of course
    degrade the image quality at least a little, and the adapter might
    function as a modest teleconverter (maybe 1.2x, as a guess).

    Overall, your best bet is probably to sell the M42 Fujica to minimize your
    losses and then buy another Fujica with the X-mount. One other option if
    you'd been planning to buy new lenses in the near future would be to make
    them Tamron Adaptall lenses. These use interchangeable lens mounts, so you
    can use one lens on multiple camera bodies. You could also buy M42 lenses
    and use them with an adapter like the one that B&H sells, but you'd
    probably lose some functionality that way. (I don't know precisely what
    features the Fujica-X mount supports.)
    Rod Smith, Sep 19, 2005
  4. Rex the Strange

    Peter Chant Guest

    I bought my uncle an Adaptall with the required Fujica adapter. From
    reading the web unfortunately they seem rare.

    Hmm, whilst having a quick delve on ebay to make sure I could back up the
    claim I may have found the very thing.

    I cannot comment on whether that is what you want but it looks like it!

    Peter Chant, Sep 19, 2005
  5. Rex the Strange

    Rod Smith Guest

    Tamron lenses aren't exactly what I'd call rare. B&H lists an Adaptall
    mount for Fujica AX as being in stock. I'm not sure if that's what the OP
    would need to mount Tamron Adaptall lenses, though; I just don't know
    enough about the Fujica mount in question.
    It's not what the OP needs; it goes the other way. This auction is for
    an adapter for mounting M42 lenses on Fujica-X bodies, but the OP has
    Fujica-X lenses that he'd want to use on a Fujica M42 body.
    Rod Smith, Sep 20, 2005
  6. Thanks to all who responded - you have all confirmed what my research
    has already shown. Apparently, Fuji originally made cameras with the
    much wider used M42 (c. 1977) mount but then, for the AX series (c.
    1980) decided to try to "tunnelvision" their consumers into the X
    mount. Because their M42 cameras appeared earlier (and, for the time,
    probably rightly assumed that new fujica lens purchasers already owned
    M42 mount cameras, that they would want to convert to the newer X-mount
    lenses) they produced an M42 to X-mount converter.

    I can't blame them, after all, who would know in 1980 that their
    X-Mount would be a boondoggle? My thanks to all who responded - Rod, I
    did consider your suggestion to sell the newly acquired M42 mount
    camera and try to find an X-mount, but I think a more prudent
    suggestion would be to just simply bite the cost (a whole ruining 24
    dollars) of the M42 and go with this for future purchases as it seems
    far more compatible for ... whatever I may choose to buy in the future
    as the X-mount is such a rare commodity. No doubt I'll keep the one I
    have and will, in twenty years, make a huge profit to send my kids to
    college ;)

    Just out of interest, I inherited this camera from my wife who was
    given it from her late husband's sister. Now I see why she gave it

    I'm cool with buying new lenses. If anyone's got a deal, let me know!

    Rex the Strange, Sep 20, 2005
  7. Rex the Strange

    Peter Chant Guest

    Rod Smith wrote:

    I was lead to believe that the Tamron Adaptall to _Fuji_ M42 adapters are
    not so easy to get hold of. None came up on Ebay when I checked.
    I probably posted too late at night!
    Peter Chant, Sep 20, 2005
  8. Rex the Strange, Sep 20, 2005
  9. Rex the Strange

    Mike Guest

    The newer x-mount had more features, open apeture metering etc. and Fuji
    made an adapter so that Fuji users would be happy with their old M42 lenses
    until they could update. Fuji made some fine cameras and lenses.
    Mike, Sep 20, 2005
  10. Rex the Strange

    Rod Smith Guest

    eBay's not the only place to buy stuff, you know! ;-) B&H lists them as
    being in stock:

    Also, I just checked eBay and did find one:

    This was in the eBay "stores" area, though, and I don't know when it was
    listed; it could be new. I spotted two or three (one's description was
    vague about what it was) in the completed auctions, so they apparently do
    come up with some regularity, even if eBay's not flooded with them.

    Finally, M42 Fujicas should work with Tamron lenses with "generic" M42
    mounts, but you'll lose the open-aperture metering. This could be a useful
    stopgap measure or an acceptable mount for a seldom-used lens.
    Rod Smith, Sep 21, 2005
  11. Rex the Strange

    Rod Smith Guest

    That's certainly a reasonable approach. Which M42 Fujica did you get, out
    of curiosity? (I've got an ST-801, FWIW, but mostly I use my K-mount
    cameras.) Be aware that if you use most non-Fujica M42 lenses, you'll have
    to use closed-aperture metering (or an external meter). This is do-able,
    but is a bit of a pain. Some (most? all?) Fujica M42 lenses have a
    coupling bit that lets some (most? all?) Fujica M42 cameras meter wide
    open. M42 lenses do have the advantage of being dirt cheap on the used
    market these days, and many of them are very good. You can use these on
    most more recent cameras via adapters, but you typically lose features
    like open-aperture metering, not to mention shutter-priority and full-auto
    exposure modes.
    Rod Smith, Sep 21, 2005
  12. It's a Fujica ST-705. I also picked up (very cheaply) another X mount
    camera and (groan) more X mount lenses. I didn't expect to win the
    auction (which I bid on before winning the ST-705). Oh well, you can't
    have too many cameras and lenses.

    Oh, by the way, what do you mean by "open-aperture" and
    "closed-aperture" metering? I've been doing this for a while but I'm by
    no means an expert.

    Rex the Strange, Sep 21, 2005
  13. Rex the Strange

    Peter Guest

    Closed aperture metering, or "stopped down metering" requires you
    to press the DOF preview switch in order to get correct information
    from the built in lightmeter. This is no real trouble because the
    DOF preview switch and the meter switch are often the same switch
    in such cameras.

    Open aperture metering requires some mechanism for the lens to
    tell the meter how many stops it will close when the shutter
    is fired. Pentax, Fujica and Praktica all developed systems
    around 1970 or so which are incompatible with each other.
    Pentax and Fujica used mechanical linkages, while Praktica
    used electrical contacts. Even though the systems are incompatible,
    the lenses will still work fine using the older stopped-down
    metering method.

    When M42 lenses were first introduced around 1949, they had
    manual or preset diaphragms. In 1956, the new lenses for the
    Praktica FX2 had a pin on the back of the lens which allowed
    the camera to stop down the diaphragm to the desired stop
    just before firing the shutter. Most automatic diaphragm lenses
    for the M42 mount have an "auto/manual" switch to make the
    lenses usuable on older cameras. But no one in 1956 was thinking
    in terms of through the lens metering, so it wasn't necessary
    for the lens to be able to tell the camera what stop it was
    set to.

    So when Pentax introduced the Spotmatic in 1964, they made the
    meter switch so that it would also push the pin on the back of
    the lens. This was simple and it worked, most of the other
    M42 based cameras copied this. For some reason it was decided
    that it would be much better if you didn't have to pull the
    DOF preview lever in order to get a light meter reading.
    This time Pentax and Fujica went with their own systems instead
    of the traditional approach of copying Praktica.
    This was unfortunate, because the Praktica "electric" system was
    actually quite elegant.

    Peter, Sep 21, 2005
  14. Rex the Strange

    Rod Smith Guest

    I don't know about Rex's Fujica ST-705, but in my ST-801, the light meter
    switch is the shutter release; press partway to meter, all the way to take
    the photo. To do stop-down metering, you've got to press a button on the
    front of the body AND partially depress the shutter release. (The
    stop-down button locks, fortunately.) It's a bit awkward, unfortunately,
    but not unusable.

    Also, most bayonet-mount cameras use open-aperture metering, so these
    terms aren't used as much with them, just because closed-aperture metering
    is pretty rare in that field.
    Rod Smith, Sep 22, 2005
  15. Rex the Strange

    Peter Guest

    I should have been clearer. On cameras which are designed for
    stop-down metering the DOF preview is usually also the meter
    switch. It can be quite awkward on some cameras not designed
    to be used this way. But on a camera designed for stop-down
    metering it isn't really inconvienient at all, it just forces
    you to do a DOF preview every time you meter.

    Peter, Sep 22, 2005
  16. Rod,

    My camera is the same as your 801 (both my AX-3 and my ST-705 which
    arrived yesterday) - depress the shutter button partway for metering
    and both cameras have a button on the front - stop down metering, is
    it? It shows, through the viewfinder, the image relative to the
    aperture setting (smaller aperture and the image is darker).

    Thanks for the explanation, guys. Appreciated.

    Rex the Strange, Sep 22, 2005
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