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How do you adapt large projection lenses?
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PostPosted: Mon May 13, 2019 1:34 am    Post subject: How do you adapt large projection lenses? Reply with quote

Over several years, I've seen some of your adaptation wonders that apply to various projection lenses. I use myself several ones with no problems on ready-made adapters, the smaller ones on a custom 49mm helocoid, bigger standard lenses on a dedicated 62.5mm one.

Recently I've got a projection lens of 70mm in diameter and feel myself a bit annoyed. To spend for a dedicated helicoid and command one to a lathe craftsman seems exaggerated. To find a cheap mirror lens to disembowel it requires long fishing.

What are your methods to adapt large and rather heavy projection lenses, larger than 62.5 mm? Your know-hows of not very expensive adaptation will be, as always, appreciated.


PostPosted: Thu Jun 06, 2019 5:27 am    Post subject: Re: How do you adapt large projection lenses? Reply with quote

alex ph wrote:
Over several years, I've seen some of your adaptation wonders that apply to various projection lenses. I use myself several ones with no problems on ready-made adapters, the smaller ones on a custom 49mm helocoid, bigger standard lenses on a dedicated 62.5mm one.

Recently I've got a projection lens of 70mm in diameter and feel myself a bit annoyed. To spend for a dedicated helicoid and command one to a lathe craftsman seems exaggerated. To find a cheap mirror lens to disembowel it requires long fishing.

What are your methods to adapt large and rather heavy projection lenses, larger than 62.5 mm? Your know-hows of not very expensive adaptation will be, as always, appreciated.


You can refer below link
http://forum.mflenses.com/viewtopic,p,1526047.html#1526047
That is the focusing adapter i made.


PostPosted: Thu Jun 06, 2019 7:30 am    Post subject: Reply with quote

I'm still fishing for a suitable mirror for mine - the one i brought recently proved far too good to disembowel.
I might just end up mounting it via my 5x4 - not the most portable of solutions but should be easy enough to arrange with a little carpentry. Smile


PostPosted: Thu Jun 06, 2019 2:56 pm    Post subject: Reply with quote

Head over to Raf Camera, or find them on eBay and Amazon. Wait a few weeks for the delivery.

Treat it like any behemoth and carry your setup by the lens never to place strain on the bayonet mount.

You might have to craft some fancy lens holding technique, like pre-focus then move closer for perfect sharpness.

Did this on two heavy brass Kipronar Lenses; a 125mm f1.9 and a 120mm f1.9.

Example:

    Lens ~80mm Diameter >
    RAF 80mm to M65x1 sleeve adapter (Wrap with tape to prevent slippage)>
    M65 to M42 stepping ring (Either RAF or FotoFox) >
    M42 to M42 Macro Focus Helical (Eg. 25-55mm or 17-31mm throw Fotasy/Pixco Etc.) >
    M42 to Sony Nex Slim Adapter (Fotasy) >
    Camera Sony E Mount


Enjoy!