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Author Topic: Kollmorgen reversable anamorphic lens ? Alan Gouger Jedi Master Film Handler Posts: 501 From: Bradenton, FL, USA Registered: Jul 2000 posted 06-30-2005 03:07 PM                        Ok dumb question time. What would you use one of these for. I see these on Ebay once in a while and can never figure out a use for it. [ 01-20-2010, 10:06 AM: Message edited by: Mike Olpin ]  |  IP: Logged Mitchell Dvoskin Phenomenal Film Handler Posts: 1869 From: West Milford, NJ, USA Registered: Jan 2001 posted 06-30-2005 03:10 PM                     Reversible Anamorphic lenses are for theatres that need to shrink the top/bottom rather than expand the sides to uncompress the anamorphic squeeze.  |  IP: Logged John Walsh Film God Posts: 2490 From: Connecticut, USA, Earth, Milky Way Registered: Oct 1999 posted 06-30-2005 03:23 PM                     Yep, just what Mitchell said. They were usually used at drive-ins because of the long throws. If you needed a 9 inch focal length lens (not too common) you'd put the adapter in the 'reverse' direction, and attach a more commonly available 4.5 inch lens.  |  IP: Logged Alan Gouger Jedi Master Film Handler Posts: 501 From: Bradenton, FL, USA Registered: Jul 2000 posted 06-30-2005 03:50 PM                        I think I understand so it is still giving you a scope ratio but maintaining the original width. That makes sense.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 06-30-2005 04:02 PM                     Actually...one needs to know the Kollmorgen lens line a bit...the lens shown there is a prime lens of about 6" and the KA-299 anamorphic. In the configuration shown...it is actually working like a normal anamorphic...if it was oriented like a conventional anamorphic of today, it would be working as a reverse. This was Kollmorgen's answer for a 4" anamorphic lens since 4" primes worked with it. Since in a drive-in one would want long lenses, a reverse anamorphic with a large exit would be normal. So, one could have a 6" prime with the KA-299 and have an EF of 12" yet not be constrained by the light of a little 2-25/32 lens diameter. The lens has two sets of distance markings. The "Ordinary" lines are in red and the "reversed" lines are in black.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 06-30-2005 07:53 PM                     The KA299 was also never a lens that had even decent resolutuion. If that was a Schneider or ISCO reverse anamorphic then you could actually obtain superior resolution over using a standard a 2X anamorphic under the right conditions because there is less squeeze (unsqueeze or anamorphic gain) ground into the lens. The result is less barrel distortion and alot less residual astigmatism. Mark  |  IP: Logged Tim Reed Better Projection Pays Posts: 5246 From: Northampton, PA Registered: Sep 1999 posted 06-30-2005 08:32 PM                       What Steve said. This particular attachment is "built" in the reverse direction.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 07-01-2005 05:41 AM                     That lens was not actually built by Kollmorgen but by Kasaka of Japan. It and the KA298 were the beginnings of Kollmorgen and eventually Schneider's less than thrilling anamorphics.  |  IP: Logged System Notices Forum Watchdog / Soup Nazi Posts: 215 Registered: Apr 2004 posted 01-19-2010 10:18 PM                 It has been 1663 days since the last post.  |  IP: Logged Xavian-Anderson Macpherson Film Handler Posts: 6 From: Salem, Oregon USA Registered: Jan 2010 posted 01-19-2010 10:18 PM                     My apologies to everyone who reads this. I know this is a very old thread. But I need information desperately. I just received one of these today from eBay. I had the crazy idea that maybe the Kollmorgen could be converted. At least, I wanted to play around with it. I have the large 4" 101.6mm KA299. I'm not interested in using it for anything else other than experimentation. So I want to know how to take the thing apart. It seems some of you here are very experienced with this lens. So I hope someone will respond to this and answer my questions. If I should have started a new post, let me know. Xavian-Anderson Macpherson ShingoshiDao  |  IP: Logged Sean McKinnon Phenomenal Film Handler Posts: 1712 From: Peabody Massachusetts Registered: Sep 2000 posted 01-20-2010 10:53 AM                        I was installing a drive-in one time and the reverse anamorphic was damaged in shipment and there was no way to get it replaced in time for the advertized opening. However, there was an old regular anamorphic laying around from some used equipment that was purchased. We fashioned a piece of sheet metal and pipe collars to hold the anamorphic onto the front of the century sa backwards and installed the prime lens in the regular lens collar. Now I know what you must be saying but beleive it or not once everything was aligned it actually looked decent. A lot better than I thought it would. I figured it would barely get them through as not opening was not an option (the owners entire life savings was invested in this project) but it actually worked out well. Now the good thing was both films being shown for this double feature were scope so they did not have to take the lens off. I wouldn't beleive it if I hadn't done it myself!  |  IP: Logged Tony Bandiera Jr Film God Posts: 3067 From: Moreland Idaho Registered: Apr 2004 posted 01-20-2010 12:58 PM                     Sean, I have done a similar "Rube Goldberg" thing to get an integrated 16mm anamorphic to fit my Kinotons...I wrapped the barrel of the lens with scrap film to make it fit in the holder!! It worked quite well. I now have the machine shop equipment to fabricate a proper aluminum adapter collar.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 01-20-2010 01:02 PM                     Dismantling a B&L scope lens is detailed below and the Kollmorgen may be the same... To disnmantle a B&L lens unscrew the front locking ring all the way. Then unscrew the focus ring in the opposite direction until it falls off. Under that you'll find slots with dogs in them. Loosen the screws in those dogs and the front element group can be pulled out in it's metal tube. Rermoving the lenses will require special spanner wrenches tor emove the actual threaded rings holding those in. Those spanner wrenches are very hard to find and you may have to make your own. Hope this helps... Mark  |  IP: Logged Xavian-Anderson Macpherson Film Handler Posts: 6 From: Salem, Oregon USA Registered: Jan 2010 posted 01-20-2010 06:11 PM                     Is the same thing true for the Kollmorgen-Kosaka KA299? I had to soak the threads overnight in WD-40 to get the locking collar to move. Once I did that, I was indeed able to remove it. The focusing ring took a bit longer to get free. But it seems to stop at the bottom of it's adjustment. I will have to try this again, and see if it applies. But if the lenses are different, the Kollmorgen may not disassemble the same way. When looking inside of the lens, I could see the dogs you mentioned here. There's an independently rotating ring for the scale which moves somewhat freely. But the focusing ring does not come off. I suspected that it should. So I'm happy to hear that my assumption was correct. I will be supplying photos of the lens as I advance through this. Xavian-Anderson Macpherson ShingoshiDao  |  IP: Logged Xavian-Anderson Macpherson Film Handler Posts: 6 From: Salem, Oregon USA Registered: Jan 2010 posted 01-21-2010 06:33 AM                     Xavian-Anderson Macpherson needs to read the rules and FAQ. [ 01-21-2010, 12:09 PM: Message edited by: Mike Olpin ]  |  IP: Logged

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