Silly Question about Canon 7D and B4 lenses

Zacatac

Zacatac

Well-known member
So I have this b4 lens 9.5 to 153mm f1.6

and I would love to stick this on my canon 7d, I don't care about doubling, as long as it doesn't turn into "wide" at 50mm I'd love it to be wide at 28... but how do I got about figuring out what I need to get the image to fit onto the 7D sensor?

I'l figure out mounts later :D
 
Even if you could mount the lens I bet it would vignette like crazy :)

550px-Sensor_sizes_overlaid_inside_svg.png
 
I'm thinking, I have a 1.4 tele converter, and could get a 2x converter... that just might cover me from vignettes... and will give me 26.6mm


Going to order and try this
 
Im not sure what mount the b4 is but a little research found this thread

http://dvxuser.com/V6/showthread.php?t=215367

It got me interested because we have a couple of old canon Hi8 and BetaCam cameras that use this same type of lens i believe. Now im very intrigued...

Obviously the 4/3rd chip doesn't have the same problem with vignetting because of the smaller footprint but maybe with some extenders we could have a great lens with a huge range of focal lengths.

Do you have a way to get the servo zoom to work?

Edit:

I went and looked and the lenses we have are mounted on Sony bodies. They are both Fujinon Eagle lenses. The one i made note of was the Fujinon Eagle S16x BRM-18b. Now i dont know much about these cameras because I never used them but could anybody give me a hint as to what mount these lenses are? They both look like very high quality lenses that are very fast (1.8 and 1.4 respectively)

Thanks guys
 
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They should be B4 mount, I found that GH1 thread, and thats what got me going since I have this old B4 mount lens laying around...

Once I get some cash, I'll see about getting the 2x extender
 
treynolds said:
Obviously the 4/3rd chip doesn't have the same problem with vignetting because of the smaller footprint
Click to expand...

You will still have problems with vignetting, look at the diagram above. Micro 4/3 is HUGE compared to 2/3". You could easily lay out four 2/3" sensors in the area of a micro 4/3s sensor.

Not that I am uninterested in your experiments, I would love to see what comes out of this!
 
saneproductions said:
You will still have problems with vignetting, look at the diagram above. Micro 4/3 is HUGE compared to 2/3". You could easily lay out four 2/3" sensors in the area of a micro 4/3s sensor.
Click to expand...

You right arent you. I didn't look too closely at that chart i was just thinking that the 4/3 chip is smaller than the ship in the 7d/550d and that would mean less vignetting.

I wonder if i could make a mount out of those extender tubes for macro shooting. That mixed with a little ingenuity could get a physical mount made but it would not deal with the vignetting. That would require an extender i could imagine.
 
More good news. Fujinon lenses that start with an S are for 1/2 inch chips not 2/3. The 2/3 Fujinon lenses begin with A. Good Luck.
 
the lens i have from the Hi8 camera is an A model but the one from the Beta camera is s so i will start with that one.
 
Looks like the flange back distance on the 2/3 lens is 48mm which will allow infinity focus on the 7d. Have you guys looked at any of the lenses with a doubler/2x built in. I know they eat at least a stop of light but I have no idea if the image circle is doubled as well. If everything was candy and kitties, probably not, a doubled f1.4 lens zoomed to 50mm to cover the sensor would yield a 50-300 f2.0. Pretty cool keep us posted.
 
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