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Old January 29th, 2009, 10:11 PM   #1
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35mm Adapter Neccesary?

So ive seen some post talking about just directly mounting like SLR canon lenses on the end of the bayonet. Is it possible to do this with a bayonet adapter? Because Everything Ive read says you have to have a Letus or Red rock etc etc. I want a better DOF and cant get it with the stock lens.

-Cameron
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Old January 29th, 2009, 10:18 PM   #2
 
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This issue crops up every now and again. Mounting a 35mm lens to a 1/3 inch sensor plane won't yield a shallower DOF. What you'll get is some pretty good magnification, on the order of 7x, but, no change to the DOF.
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Old January 29th, 2009, 11:10 PM   #3
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So to get the enhanced DOF i would have to have an adapter?
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Old January 30th, 2009, 03:39 AM   #4
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Quote:
Originally Posted by Cameron Frittz View Post
So to get the enhanced DOF i would have to have an adapter?
The DOF of a particular focal length at a particular f stop won't change hugely between formats. However, if you use what would be a slightly wide angle focal length on a 35mm SLR onto a 1/3" video you then will have a narrower angle of view (more a telephoto lens effect).

So, if you wish to keep the angle of view of the 35mm format lens on a 1/3" or 2/3" camera you need to create a 35mm sized image that the smaller format video camera can record. Because you're using a longer focal length lens you'll have the shallower DOF. So you'd need a 35mm adapter to do this.

I'd avoid using terms like "better", because that would depend on what you're trying to do. Shooting a model for a visual effects shot you want a large DOF to create the illusion of the full sized object. Shooting a CU of a human model you may wish to have a shallow DOF - unless you're making "Citizen Kane"
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Old January 30th, 2009, 07:52 AM   #5
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Well im shooting more cinematic things. I have a few lenses to work with so there different depths but i would defiantly need a 35mm adapter. Can you recommend a good cheap one?
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Old January 30th, 2009, 03:00 PM   #6
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Letus Extreme

Brevis MP1

Redrock M2

Letus did make a version specifically for the JVC HDxxx series that mounted straight to the camera. Good luck finding on though.
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Old January 31st, 2009, 11:17 AM   #7
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The 1st version of the HDxx compatible letus is not so ideal as it had a big crop factor. Using the stock as relay is still the best way to go in an HDxx + adapter setup.
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Old January 31st, 2009, 04:51 PM   #8
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Ah ic. Ok. Well what if i wanted to go about making my own Adapter? Do yall know any info on doing that?
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Old January 31st, 2009, 11:40 PM   #9
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Cameron,

You'll find a wealth of information in making one at the alternative imaging thread.

Alternative Imaging Methods - The Digital Video Information Network

Here's something I made

http://www.dvinfo.net/conf/alternati...mm-lenses.html

Ted
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Old February 1st, 2009, 01:56 AM   #10
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Thanks ted i will defiantly look into that.
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Old February 2nd, 2009, 08:16 PM   #11
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Ted did you make the design with a CD in it?
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