Beck Biplanat 12" (300 mm) XIX century brass lens.

[Petzval 1840]

Hello:
I show them my British lens Beck. The pieces of aluminum demonstrate that it cannot be very ancient, or that it was repaired it does relatively little.
The thread measures approximately 60 mm of diameter and the entire length is of approximately 70 mm. The weight is one kg approximately.

It will be a problem to connect this lens to my bellows of M 42.

It is possible that it is the type of lens of the French link.

Bests Regards: David

http://dioptrique.info/OBJECTIFS5/00211/00211.HTM

[luisalegria]

Aplanat = Rapid Rectilinear

Biplanat may be the same thing, but who knows.

To mount it, one suggestion -

If the thread is really 60mm, this is a rare thread but parts are made for it.

There are step-up rings to 60mm. I think this is for 60mmx.75, and your thread pitch is larger, but it only needs to screw in a little way. Not too tight !

http://cgi.ebay.co.uk/55-60-Step-up-filter-ring-Stepping-Adapter-55mm-60mm_W0QQitemZ200400301530QQcmdZViewItemQQptZUK_Photography_CameraLenses_Lens_caps_hoods_adaptors_ET?hash=item2ea8c9edda

Add to this a 52-55 steup-up ring, and then -

42mm to 52mm 42/52 M42 Filter Adapter Ring

http://cgi.ebay.com/42mm-to-52mm-42-52-M42-Filter-Adapter-Ring_W0QQitemZ360229988238QQcmdZViewItemQQptZUK_CamerasPhoto_CameraAccessories_CameraLensesFilters_JN?hash=item53df61678e

[Petzval 1840]

Hi Luís Alegría and all the people.

In house I have two winches and gaugues to know that type of thread is. What lacking me is a time and desire.

I have already received the lenses of the Graflex, either I exhibited in the forum a photo of a castle taken with an Ektar 127 mm - f: 4,7. The quality of these lenses is excellent.

Bests Regards: David