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09-14-2014, 07:24 PM   #1
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'Formula 5' Extension Tube (?)


Extension Tube – all metal, very solid and, judging by the tattered cardboard box, well used and fairly old. I guess ‘Formula 5’ is the brand but there’s no mention of it anywhere.

End threads - inside diameter 36mm, o/s 42mm. No glass. Gravity (free-moving, unsprung) contact pin/rod in each segment for Automation info to the camera.

Anyone know of it and does it require mounts to the camera and lens or is it specifically for a thread-mount camera? It’s for my Pentax DSLR, K10D

I’m itching to get into some Macro as soon as I have my focus problems sorted. And that oughta be soon.


Last edited by Mike Gallagher; 09-14-2014 at 07:26 PM. Reason: added word
09-14-2014, 07:29 PM   #2
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Looks to be M42. If so you could use it if you have a k-mount to M42 adapter for the camera and then an M42 lens like one of the Takumars. If you do not already have M42 lenses I don't think it would be worth the trouble but YMMV.
09-14-2014, 07:33 PM   #3
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Thanks jatrax.You may well be right on both counts. Those are my suspicions too.
Mike.
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