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Old May 4th, 2007, 12:53 PM   #1
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Relay lens for HD100?

Would this lens work as a relay between the HD100 and 35mm adapters like the Brevis and M2?

Schneider Optics Cinegon 1/3" 5.3mm F2.0 C-Mount
Minimum object distance - 70mm (2-3/4")
52mm thread

$1525 at RMA Electronics
http://www.rmassa.com/manu/schneider.htm
http://www.rmassa.com/specsheets/21-036939.pdf
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Old May 4th, 2007, 01:26 PM   #2
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I dont think so but I am not a lens tech so don't take too much notice of my comments. For that price you might be better off trying a 28mm or 35mm SLR camera lens. At least you can use them on front if they don't work as relay.

Quyen Le uses 50mm Minolta for the Letus35 HD and that images a smaller area off the GG than his other models for lens-in-camera camcorder types. 40mm - 45mm might be better. 5.4mm may be way too wide.

Shorter "in air" distance from flange to focal plane of the c-mount may be a problem. It is 17.5mm.
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Old May 5th, 2007, 10:52 AM   #3
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hd100 relay

these guys are working on one for the hd100 . info@lensmounts.com www.lensmounts.com
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Old May 7th, 2007, 06:22 AM   #4
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i'm thinking about using one of those lens as relay: very fast (f0.5 to f0.9)
http://www.muellerworld.com/exhibits/fast_lens/

light matters !
but i need to use a closeup lens with it and ability to focus on the ground plane of the 35mm adapter.

what's about it ?
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Old May 7th, 2007, 05:51 PM   #5
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Originally Posted by Eric Ramahatra View Post
i'm thinking about using one of those lens as relay: very fast (f0.5 to f0.9)
http://www.muellerworld.com/exhibits/fast_lens/
Wow, lots of glass there. What's the cost of those lenses and where can you buy them?
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Old May 7th, 2007, 06:47 PM   #6
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very good question, still searching :)
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Old May 8th, 2007, 01:27 AM   #7
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Shoot me if I'm wrong, but wouldn't just about any slr-lens work as a relay as long as the distance between the lens and sensor is appropriate?

A good slr-lens and an extension tube with the correct mounts would do fine.
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Old May 8th, 2007, 05:45 AM   #8
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I posted this some time ago. I got it from google somewhere.
Maybe its useful for someone.

Its a selfmade relaislens for the canon xl cameras.
http://www.jetsetmodels.info/pics/relaislens_1.jpg

best regards

Daniel
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Old May 8th, 2007, 07:44 PM   #9
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Originally Posted by Daniel Schaumberger View Post
I posted this some time ago. I got it from google somewhere.
Maybe its useful for someone.

Its a selfmade relaislens for the canon xl cameras.
http://www.jetsetmodels.info/pics/relaislens_1.jpg
Daniel, was someone selling this relay lens?
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Old May 9th, 2007, 04:35 AM   #10
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Hi Jon,

no that wasnt for selling. I found this jpg somewhere on the net for do it yourself. Also I saw that lens Schneider Kreuznach 1:0.95 / 25mm some time ago for under EUR 100,- in ebay.
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Old May 9th, 2007, 06:44 AM   #11
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Yeah, I remember when that picture was posted here and everybody was saying that the P+S used this Schneider 25mm F0.95 as the Mini35 relay. I even bought one of them. What a waste of time and money. That lens is a C mount, which has a FFD of 17.5mm making it impossible to be used on a XL2 or HD100 unless for extra mega ultra macro close up. I'm talking about having a penny up to the front element touching the glass and only being able to get the letters EN from the word CENT written on the coin. Useless. No C mount lens will work as a relay. The P+S lens is made by them specially for the Mini35.
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Old May 9th, 2007, 10:17 AM   #12
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I'm talking about having a penny up to the front element touching the glass and only being able to get the letters EN from the word CENT written on the coin. Useless. No C mount lens will work as a relay. The P+S lens is made by them specially for the Mini35.
That's some shallow DOF!

Does anyone know if you can buy the P+S relay lens separately?
From where?
How much?
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Old May 10th, 2007, 05:39 PM   #13
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Hey Eric, you ever find out if those lenses from Muellerworld would work?

What we're finding - and i'm not sure exactly how it works. But even if you have a "fast" lens like say 1.7 (not very fast i know) (like the letus 35's minolta) you can't even take advantage of that, because when you open it all the way up, you get serious blooming (chromatic abberation) and it's useless. It basically overloads the little 1/3" ccd (i think). SO what we're working on now, is using the Fujinon as our Relay lens, because it is focusing the right size image the CCD's need, and its actually a fairly fast lens (1.4). However, the macro ability in the Fujinon, isn't substantial enough to focus on the image when you zoom in on the GG to fill the screen. So you need a macro/achromat between the Fujinon and the GG to zoom the image on the GG enough, but prevent chromatic and spherical abberations. We haven't found a suitable macro within our reach yet, and we're afraid of spending 400 dollars on one that may or may not work. We're working on something kind of sketchy now that may or may not solve the problem so i'll let you know how that goes.

Has anyone else noticed the blooming/chromatic abberation when using a normal 35mm slr lens as a relay lens with the hd100?

Just thought i'd throw our process out there, it may be interesting to some of you. Thanks

Dale
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Old May 11th, 2007, 10:11 AM   #14
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What about this lens: http://www.rmassa.com/specsheets/TF25DA-8B.pdf
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Old May 11th, 2007, 11:26 AM   #15
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Quote:
Originally Posted by Andrew Hasse View Post
* F2.2 (loses too much light)
* min. focus distance is 0.2 meters (not close enough)
* C mount (someone said they won't work)
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