8mm Forum: Bell & Howell 16mm 2 inch f1.2 projection lens thread size

This is topic Bell & Howell 16mm 2 inch f1.2 projection lens thread size in forum 16mm Forum at 8mm Forum.

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Posted by Robert Lewis (Member # 1458) on May 20, 2014, 08:41 AM:

I am wondering if anybody knows the thread size on the Bell & Howell 16mm 2inch f1.2 projection lens. It is, of course, a female thread into which one might screw an adapter ring or anamorphic lens. I have tried measuring the diameter of the thread but it is difficult to determine whether it is 52mm or 53mm, and I don't have anything with a 52mm thread which I could try. I have tried to find a specification produced by Bell & Howell, but so far without success.

Thanks in anticipation

Posted by Paul Mason (Member # 4015) on May 20, 2014, 10:17 AM:

I think your pretty safe in assuming 52mm as 53mm is not a standard lens filter mount size, the next larger standard diameter is 56mm.

Posted by Robert Lewis (Member # 1458) on May 20, 2014, 04:42 PM:

Thank you for your response.

I suspect you are correct in suggesting that it is a 52mm thread. Certainly there is a logic to it.

Posted by Paul Mason (Member # 4015) on May 21, 2014, 07:00 AM:

quote:
the next larger standard diameter is 56mm.

I should have said 55mm then 58mm. Here is link to SRB Photographic who supply stepping rings and adaptors
http://srb-photographic.co.uk/

Posted by Robert Lewis (Member # 1458) on May 21, 2014, 05:12 PM:

Paul...

Amazing! I went to see SRB Photographic today without having seen your message. I took with me both the Bell & Howell and Sankor lenses. They were extremely helpful, and I learnt that the thread on the Bell & Howell projection lens is not only a non-standard size but also that it is a 54mm thread. They agreed to make a couple of rings to fit the Sankor 16D lens on to the Bell & Howell projection lens. The thread on the anamorphic lens was confirmed as 50mm.

I have to say that I was most impressed with their helpfulness.

Regards.

Posted by Maurice Leakey (Member # 916) on May 22, 2014, 03:03 AM:

It's great news to learn that SRB are still in business and that they continue to produce items to order.

Posted by Robert Lewis (Member # 1458) on May 22, 2014, 03:06 AM:

Maurice....
Not only that, they have just completed a move into new premises.

Posted by Paul Mason (Member # 4015) on May 22, 2014, 04:06 AM:

Great news about your assistance from SRB. They do seem to be a goldmine of knowledge going back decades. About 5 years ago they made up an adaptor for mounting a Proskar anamorphic on a Canon 310XL for me at a very reasonable price.

I should have realised that the Bell Howell front screw thread would be more than 52mm since the rear barrel is already 51mm.

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