Re: C300 + B4 lenses
 

Alister is absolutely correct. Not too long ago I was on 2 camera shoot utilizing C300s. While I used Canon L primes and zooms, the other photographer utilized both Canon L zooms and a 2/3" HD wide angle lens with doubler engaged. I was initially a little jealous of this setup, as he had a nice shoulder mount rig with servo zoom. The wide was even still respectably wide even with doubler. (not sure what lens he was using)
However, while the 2/3" lens looked perfectly acceptable on it's own, when cut with my camera using the Canon L lenses it was quite obviously inferior. So I guess the point is that if you are using a 2/3" alone (or with a good quality 2/3" broadcast camera) it's probably fine. But if the content is to be intercut with quality 35mm glass, you're going to notice the difference. For me, this kind of negates the whole appeal of using this format camera anyway.

Re: C300 + B4 lenses
 

The point of my article and quickly cut together test footage - see the article and link to field footage in the articles section- was to show that this is a viable way of getting a good look out of a C300 and a once very pricey zoom lens that may be setting on your shelf. MTV is currently using C300s and 2/3rd glass on several shows. I would certainly use this setup over any Canon L series lens IF I had to move fast and zoom all day, and hit focus. You cannot get the same type of shot with anything short of the Cabrio zooms. And I really don't personally like the breathing aspects of the Cabrio. - at least not at the current price of the Cabrio-.

This adapter also seems to be smaller and cleaner than other brands on the market.

Hope this helps.

Re: C300 + B4 lenses
 

Please provide a link to the article. Thanks.

Re: C300 + B4 lenses
 

Scroll to the top of the forum page, click on articles tab, scroll down to the 3rd or 4th article,.you should see a picture of the adapter.

Re: C300 + B4 lenses
 

Interesting setup. I have shot 2 docu/reality shows on the C300, one with L glass and one with the Sony Cabrio. Neither are optimal and are relatively a pain in the ass. I would like to explore this 2/3" adapter with an HD ENG lens.

QUESTION,
when the lens is powered, will ALL lens functions work normally? Servo zoom, push-AUTO Iris?


Thanks

Re: C300 + B4 lenses
 

I called Canon and found out the answer: The lens does not "talk to the camera," so no auto-iris, but servo zoom and Rec work.

My next question is how do focal lengths change when using a 2/3's lens on a Super35 sensor. I've done some research and found the following conversion:

"It's a 2.5X crop factor between Super-35 and 2/3", and remember that the typical range of focal lengths always get shorter for smaller formats to equal the same range of views of longer lenses on larger formats."

S35 16mm = 6.4mm in 2/3"
S35 24mm = 9.6mm in 2/3"
S35 32mm = 12.8mm in 2/3"
S35 50mm = 20mm in 2/3"
S35 85mm = 34mm in 2/3"
S35 135mm = 54mm in 2/3"

So if I am using a Canon HJ17ex6.2B with a focal length of 6.2-106mm, what does that convert to with a Super35 camera (C300)? Would it be on a S35 16-265mm roughly (with the 2.5x crop?

I am new to this and would appreciate any insight.

Re: C300 + B4 lenses
 

Here is the link to Craig\'s article:
Review: MTF Lens Mount Adapter at DV Info Net

Terry Nixon
Texas Media Systems: Video Acquisition, Pro Audio, Video Editing, Integrated Systems
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