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Bolex/Switar 12.5-100 zooms with 6.5mm Aspheron


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#1 Greg Wood

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Posted 29 March 2006 - 07:14 AM

I have a Switar 12.5-100mm zoom I use with Bolex cameras (non TTL auto-metering version). I want to use it with the appropriate 6.5mm Asheron wide angle attachement (which I don't have yet). My lens does NOT have the knob marked "aspheron" at the back of the barrel.

Firstly, what exactly does this knob do - compensate back-focus for when the Aspheron in attached?

Secondly, can I use an Asheron 6.5mm with my 12.5-100mm lens (that doesn't have the knob marked "aspheron")?

Has anyone been down this path before?

Thanks in advance...Greg
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#2 Nick Mulder

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Posted 01 April 2006 - 05:13 PM

gidday greg :D


the aspheron knob on my lens will pull at least the rear element about ~2mm back into the lens housing
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#3 Boris Belay

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Posted 05 April 2006 - 12:23 PM

Hi Greg,
I haven't tried, but I doubt it would focus right. The 'Aspheron' knob functions a bit like a macro position when the Aspheron lens is not mounted on.
What kind of V-S 12.5-100 do you have ? Is it Bolex specified or made for another brand ? C-mount, Bolex Bayo mount, or somethig else yet?
Best,
B.
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