35mm Adapter Neccesary? at DVinfo.net

Cameron Frittz · January 29th, 2009, 10:11 PM

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

Bill Ravens · January 29th, 2009, 10:18 PM

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.

Cameron Frittz · January 29th, 2009, 11:10 PM

So to get the enhanced DOF i would have to have an adapter?

Brian Drysdale · January 30th, 2009, 03:39 AM

Quote:

Originally Posted by Cameron Frittz

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"

Cameron Frittz · January 30th, 2009, 07:52 AM

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?

Johnny Clark · January 30th, 2009, 03:00 PM

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.

Ted Ramasola · January 31st, 2009, 11:17 AM

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.

Cameron Frittz · January 31st, 2009, 04:51 PM

Ah ic. Ok. Well what if i wanted to go about making my own Adapter? Do yall know any info on doing that?

Ted Ramasola · January 31st, 2009, 11:40 PM

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

Cameron Frittz · February 1st, 2009, 01:56 AM

Thanks ted i will defiantly look into that.

Cameron Frittz · February 2nd, 2009, 08:16 PM

Ted did you make the design with a CD in it?

January 29th, 2009, 10:11 PM	#1
Cameron Frittz Regular Crew Join Date: Jan 2009 Location: Astoria, NY Posts: 45	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

January 29th, 2009, 10:18 PM	#2
Bill Ravens Join Date: Nov 2001 Location: santa fe, nm Posts: 3,264 Images: 10	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.

January 29th, 2009, 11:10 PM	#3
Cameron Frittz Regular Crew Join Date: Jan 2009 Location: Astoria, NY Posts: 45	So to get the enhanced DOF i would have to have an adapter?

January 30th, 2009, 07:52 AM	#5
Cameron Frittz Regular Crew Join Date: Jan 2009 Location: Astoria, NY Posts: 45	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?

January 30th, 2009, 03:00 PM	#6
Johnny Clark New Boot Join Date: Jan 2009 Location: Madison, WI Posts: 22	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.

January 31st, 2009, 11:17 AM	#7
Ted Ramasola Trustee Join Date: May 2005 Location: Allen, Texas U.S.A Posts: 1,117	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.

January 31st, 2009, 04:51 PM	#8
Cameron Frittz Regular Crew Join Date: Jan 2009 Location: Astoria, NY Posts: 45	Ah ic. Ok. Well what if i wanted to go about making my own Adapter? Do yall know any info on doing that?

January 31st, 2009, 11:40 PM	#9
Ted Ramasola Trustee Join Date: May 2005 Location: Allen, Texas U.S.A Posts: 1,117	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

February 1st, 2009, 01:56 AM	#10
Cameron Frittz Regular Crew Join Date: Jan 2009 Location: Astoria, NY Posts: 45	Thanks ted i will defiantly look into that.

February 2nd, 2009, 08:16 PM	#11
Cameron Frittz Regular Crew Join Date: Jan 2009 Location: Astoria, NY Posts: 45	Ted did you make the design with a CD in it?