Greenscreen + 35mm adapter?

B

boke

Active member
I've decided on getting the DVX100B and I'm wondering if I need/could use a 35mm adapter. I'll be using it for my e-learning applications, which are basically made in Flash and then I'll take video of the teacher/guide , chromakey it and insert it into the already made Flash program. So click this button and the guide video comes up to explain it, basically an interactive textbook, where the teacher looks like he is "in" the program/textbook. I'll be recording 3/4 or full body of the teacher, obviously using a greenscreen.

Has anyone had any success with using 35mm adapters with greenscreens?

Does it sound like it could really help my production?

If it could help what kind of lenses would be ideal? Don't know if this makes sense but I thought that the blurrier the greenscreen the easier it is to chromakey. Would a "basic" 50mm lens work well?

Thanks everyone for your help, I'm really more of a Flash/Actionscript Developer than anything, so bit of a noob here.
 
I use the DVX and the LEX with Greenscreen all the time. I am not sure about the "bluriness" as you put it, make it easier to key. It is just easy to key. IMO I am not really sure if the cost of the adapter and everything you need to to go with it makes sense for what you are doing. You could shoot that with the basic DVX lens and be fine. But if you do go with the adapter a 50mm is great starting point, but I would at the least get at 28mm as well.
 
No, it will not help your production. It will require more light, and the shallow DOF will make keying harder as some lines around your subject will be out of focus while others will be in focus. This usually demands several mattes to make a decent key. Out of focus edges are the hardes to make look right. Depending on brand, you may also get vignetting with 35mm adapters, and that also makes for harder keying.

Other than throwing your greenscreen out of focus, you would not gain anything but extra work using a 35mm adapter. If your greenscreen is smooth and well lit it should not need to be thrown out of focus. Take a look at the matte-thingy Phillip Bloom promotes: http://www.vimeo.com/1103172

Might be a better investment?

Also, with a 35mm adapter you will lose some slight optical resolution (not that much, since you're shooting SD).
 
Agreed..no point to an adapter here. You want very even light distribution to your background and most 35mm lenses have light fall-off used wide open....
 
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