>Date: 28 Jan 2000 10:31:20 +1000
>From: Christopher Biggs <chris@xxxxxxxxxxxxxx>
>Subject: Re: [OM] Conversion of pentax screw bellows to OM?
>
>Dylan Sutton <dsut4392@xxxxxxxxxxxxxxxx> moved upon the face of the 'Net
>and spake thusly:
>
>
>> I'm wondering if anyone has any ideas on the feasibility of converting them
>> to OM mount? Are the lensmount diameters reasonably similar?
>
>Yeah. An M42 lens is a bit smaller. I've heard rumours of a magic
>M42 adaptor that fits *inside* the OM mount, but never seen one.
I'll have a rummage around a few shops before I hack up my old 28mm...
>> to the parts I would need, with a dead OM10 to scavenge from for the front
>> of the bellows and a heavily fungated nasty old 28mm for the rear (or I
>
>Why not find a crappo OM teleconverter and saw it in half to get the
>mounts (or unscrew them). I have two (single element! be afraid!)
>crappo OM teleconverters that I paid $30 each for, which was probably
>too much.
Because I don't need to - neither the OM 10 nor 28mm mushroom farm ("Focal"
brand, bought _new_ from K-mart for A$22.95) are of conceivable use to
anyone in their current state.
>> could just get a screw-OM adaptor I guess, but that's extra cost and less
>
>> The second alternative is to just use a screw to OM adapter on the rear,
>
>The adaptors have a lens. You'd need to take the lens out, or build
>one without. Why not convert the bellows to T-mount, (42mm but
>different thread pitch). OM to T-mount adaptors are cheap and need no
>lens (T-mount is designed with deeper than normal mount distance so
>that adaptors for most 35mm cameras need no lens).
If I'm already converting, I'd be better off just converting to OM mount
and not using any adaptors, wouldn't I?
>> and pick up a cheap screwmount lens for it. This may be the better option
>> since I have no OM macro lens anyhow - can anyone recommend a good, cheap,
>> common screw-mount macro lens?
>
>Look for an enlarger lens in 42mm, or a 39mm enlarging lens and a step
>ring.
If the project goes ahead there's an enlarging lens here at the university
that never gets used (along with a large format enlarger and two 35mm
enlargers...obsoleted by digital acquisition and fashion conscious science
funding bodies - what a criminal waste!). I might have to drag my PhD out a
bit longer to be able to call it 'borrowing' though!
>Or reverse a 50mm M42 lens using an M42 reversing ring (paid $5 for
>one of those).
Couldn't I reverse any sort of lens of the right filter size, regardless of
mount or focal length? Take pity, you're confusing me with all these
options!
>> The third option is not to buy it at all, but someone will have to give me
>> advice on kicking this addiction. I don't _need_ a set of bellows,
>> especially having just completed (thanks to Wayne Harridge) my set of auto
>> extensiopn tubes!
>
>Send me the tubes and buy the bellows.
>
>Glad to be able to help, :-)
> Chris
Woe is me! I should have never started this...
Dylan
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