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Hi,
I recently got another second-hand beaulieu with a Schneider-Kreuznach 6-66 lens. Got it at a neat price, and it actually appears to work properly (unlike the first one I had for a few weeks).
Except that the lens is very badly collimated, so bad that it's only possible to focus the picture at very large focal lengths.
Does anyone know how to collimate one of these Schneider lenses? I would like to try it myself first. If I get it done professionally I reckon it'll cost me more than I payed for the camera.
thanks in advance,
Daniel
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Hello,I have same one!
And I disassembled it myself for cleaning and light repair, because I did not know technicians who do it.
Please loosen 5 very small screws on the focus ring.
The focus ring becomes free, and you can adjust stop position of the infinite in tele end of the zoom.
And after you did it,please turn the zoom ring to the maximum wide angle.
If the finder image looks sharp, your lens will be useful.
Please try it, to save money!
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Hm, I'm not sure we're talking about the same thing here ...
I mean the adjustment of the flange focal distance (which is supposed to be 17.52mm for Beaulieu cameras, and in fact all cameras with the C-mount connector).
Which involves moving the rear lens element, not the front.
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Just curious, do all Cmount lenses have 17.5 mm threads? I am looking into buying a wide lens for my 16mm camera that has an unkown thread of 34mm. Would it be hard to get an adapter from 34 to 17mm so I can use this wide angle lens??
Thanks
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Is the mount of the body bad?
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Holy shiese! (did I spell that correctly?)
This is the first time I've heard a non-American say "I reckon"!!
I thought our slaughtering of the English language was mostly confined to the continent!
Matt Pacini
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Lens collimation:
Just some info. The following is from collimating of Canon S8 814XL-S lenses. I believe that the principles are much the same.
At first glance it seems to me that it is a job for an authorized lens workshop due to some special tools needed.
Anyway here it is. Its OCR scanned from a manual so it might not be all that good but ut gives an idea what it is about.
Adjustments
For all adjustments, the main power switch should be on.
Focus Adjustment
1. 100 & 600mm collimator Method
A. Open the shutter.
B. Open the aperture.
C. Install the focal plane mirror tool.
D. Adjust at Tele by moving the focusing ring stopper.
E. Adjust at wide by moving the relay lens (SE-182 tool)
F. Alternately adjust tele and wide until best focus is acheived at both.
Collimator Limit Model f Collimator f scale = 0.01mm (mm).
814 W 100 4 +/-0.02
XL-S T 600 2.3 +/-0.02
Notes: 100-600mm Dual Focal Length Collimator
Instructions: C-00l-6
Catalog No.: SC-003-2
To establish collimator scale value, check several new units and average the results.
MACRO focus is not separately adjustable. If normal focus is correct, MACRO will also be correct.
2. Lens Projection Test Method (Afocal adjustment not necessary)
A. Open the shutter.
B. Open the diaphragm to maximum.
C. Set the zoom ring at the wide angle end (not macro)
D. Set the focusing ring at two meters and set the camera film plane two meters from the projection surface and normal to it. (Observe all projection test rules)
E. Install the projection chart cartridge in the camera.
F. Adjust the relay lens position with the tool (SE-182)
C. Adjust for sharpest focus by:
1) observing the finest lines in the projected chart image (100 or 125 l/mm), or,
2) Observe the colour fringe shift from green to red and set just at the changeover point.
H. Tighten the relay lens setscrew.
I. Set the lens at infinity (?) then slowly adjust toward a closer distance until the chart image is again sharpest. The focusing ring should be at two meters. If not, readjust.
J. Stake the relay lens setscrew with screw lock..
Note: Test Equipment: Super 8 lens Projection Test Unit (SU-024)
Lens Projection Test Method
(Afocal adjustment necessary) *
A. Open the shutter.
B. Open the diaphragm.
C. Free the focusing ring by loosening the three setscrews.
D. Adjust the tele focus with the front lens;
E. Adjust the relay lens to adjust the wide angle focus. (Alternate "D" and "E" for best focus)
F. Set the focusing so 2m is aligned with the index and tighten the three setscrews.
Note: Detail adjustment are identical to section 2.
Afocal adjustment is normally only necessary if the zoom lens unit has been disassembled.
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Forrest Warrior
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It might be that
salt-sg - san
is up to something here still if you compare his tips to the
"1. 100 & 600mm collimator Method"
described above.
It does have some similarities.
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Forrest Warrior
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Hi all,
I?m a very realistic guy, knowing about the extremly small tolerances allowed in S8 for sharp focus. So I highly recommend to leave this job to a specialized service man.
Anyway special tools and knowledge are needed. (colimnator). When having both, it?s a rather quick job you can wait for when bringing in the camera and lens. And it is not costy at all. Here I?m paying for colimnating customer?s lenses to the Beaulieu 9008 body only about EUR 50 or less (depening if the adjustment pins are on the correct position or not). When purchasing an add. lens for the camera, colimnation is always included in the price.
Vasted footage because out of focus or for testing of the home experiments is much more expensive than the colimnation job.
Pedro
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Agree with Pedro. Its a job for an authorized workshop.
It will be no useful with a precision cam and lens if its not properly adjusted.
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Forrest Warrior
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Hi S8 Booster,
How much cost is required, to get a collimator?
I have some C-mount cameras which must be adjusted, but not money enough.
Well, I thought that the Schneider has a simple and very solid structure.
So I guess that most cause may be in the camera body, especially if the back focus is short.
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Hey, thanks for all those replies!
supa_ate_sixteen, 17.52mm isn't the thread but the distance between the centre of perspective and the film plane. The thread is 25.4mm, according to the Beaulieu manual.
salt-sg, the mount is ok... that isn't the problem, but thanks for the idea.
Matt, I didn't think that "I reckon" was such bad English ... or is it? Anyway I think "shiese" should be spelt "cheese". http://www.hostboard.com/ubb/wink.gif
Pedro, where do you get your lenses collimated - Bavaria?
You and S8Booster are definitely right about this normally being a job for a professional ... all the same, I've dismantled and reassembled two zoom lenses without adversely affecting the image quality: a 35mm SLR lens because 2 screws INSIDE the lens had fallen out and were rolling around, and the lens on my NizoS55 which fell apart in my hand when I got it from the post office.
Maybe I'll give it a try. I'll keep you informed how it turns out.
Daniel
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hey matt, haven't met many aussies or kiwis i reckon?
;-)
/matt
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Hello Salt-sq san.
Pedro says the costs in will be about 50 EUR in Germany which equals about ?6,000.- I believe.
I do not know if this is easy to get it done in Japan these days but I believe there must be a authorized Beaulieu dealer somewhere that can do the job.
Anyway there must be a vast number of other lens specialist companies in Jappan that can do tit.
I tried to find out if there was any available companies that maintained Canon cams in Japan a few years ago but I was told that there weren?t.
Maybee its easier with the Beaulieu?
Just did a wild try here if you haven?t been there already:
http://www.nsg.co.jp/nsg/device/products/other/cl.html
http://cine8mmfilm.tripod.co.jp/Link/link.html
RGDS
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Forrest Warrior
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Hi,
just found this page by Martin Baumgarten: http://lavender.fortunecity.com/lave...llimation.html
It seems to cover the most important points of homemade collimation except for one ... exactly what is the "adjustment slot on the rear optic" he's talking about? Any idea?
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Hey Vurfer, yes, Bavaria is the next place for me. After phoning them, in most cases you can wait for small adjustments. But you must consider, that their first priority is the maintainance of studio equipment, and if there is a problem during film shooting or a on-air transmission, we private customers have the second priority.
I think there is no special Beaulieu service needed to adjust the colimnation of a Beaulieu lens. There is NOTHING to do at the body. The adjustment is made at the back side of the lens, right in the same way as with any other tv, 16 or 35 mm lens. So any company that services camera equipment for film and tv probably can do the job.
Pedro
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