Film-Tech Forum ARCHIVE: Short throw Scope lenses

This is topic Short throw Scope lenses in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.

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Posted by Matthew Taylor (Member # 2310) on 04-14-2004, 04:21 PM:

Are there any scope lenses on the market that focus down to throws less than 10 feet without modification?

Posted by Richard Fowler (Member # 893) on 04-14-2004, 06:11 PM:

You can use some anamorphics made for 16mm projectors with an adapter ring...some light loss and restriction of image size

Posted by Mark Gulbrandsen (Member # 72) on 04-14-2004, 07:19 PM:

Yes! A Standard ISCO MC2X will most certainly focus that close. I believe that the barrell is marled for 12 feet as it comes from the factory but the actual focus will adjust to a shorter distance yet that is just not engraved on the ring.

Mark @ CLACO

Posted by Larry Myers (Member # 738) on 04-15-2004, 04:37 PM:

Hi

The ISCO MC's are close marked at both 17 ft and 5 meters which is a little less the 17 ft. I can get mine down to 13 ft. After that, focus falls off a cliff. I think the SuperPanatar adjustable mirror anamorphics will focus down to a foot or so. A least I saw one attached to a Holmes 8 focused down to 1 ft in an apartment closet

Larry

Posted by Matthew Taylor (Member # 2310) on 04-15-2004, 04:41 PM:

Thanks Guys.

I need one that will focus down to 7 foot. I'll have to make sure I try out one of the Isco's before I get one - just in case it doesn't go that far.

Thanks again.

Posted by Richard Fowler (Member # 893) on 04-15-2004, 05:51 PM:

Mirror and prism type anamorphics usually suffer chromatic aberrations in the image if it is working out of the focus range it was designed for since there is usually no adjustable corrective lens with these units......but there are prismatic types used for video projectors, which are for short throws which may work for your situation...example this company in Finland www.prismasonic.com

Sankor 16mm D type lens with 52mm rear thread with an lens adapter and there is a type "C" 35mm anamorphic for direct attachment to a 70.6mm diameter cinema lens that will focus to 5 feet....

Posted by Jeff Stricker (Member # 224) on 04-16-2004, 07:07 AM:

I've used a Sankor type 16D anamorphic adapted to a 3.5" standard lens with good results at 15 foot throw.

Posted by Robert Throop (Member # 61) on 04-16-2004, 02:19 PM:

Richard,
Those Prismasonic anamorphs appear to be adjustable from 1.2-1.5x which would seem to rule out their use for film. Or am I missing something?

Posted by Mark Gulbrandsen (Member # 72) on 04-17-2004, 07:44 PM:

The standard Panatar would only go as close as 70 feet but they did make a special diopter for closer distances but I've only seen one go as close as 40 feet with the diopter they supplied. The thing about prism anapmorphs is that they can actually produce less chromatic aberation if designed correctly. Panavision sure had that aspect worked out at least for their camera lenses as the Camera 65 and Technirama Delrama mirror/prism anamorphics they made for camera use had so little aberation that they still easily compete with the finest anamorphic lenses made today. The big down side was the size and weight of them.

Mark

Posted by Gordon McLeod (Member # 33) on 04-17-2004, 10:33 PM:

Not just the size and weight but the light loss
I used to have a set of Hilux 264's with front elements for 20'