qwerty123 January 3 "Anybody tried the jinfinance b4 to micro 4/3 adapter? Feedback / thoughts?"

Yes I ordered some. The notch is not at the top where it's supposed to be but at an angle. It's fine for lenses without a zoom servo / handgrip, but if you're planning on keeping the servo / handgrip on then it's no good because it points down at a 45 degree angle.

I bought more than I need and because of this I would like to sell some of mine. I don't know the protocol for listing "for sale" items in this forum but I will sell them at a $10 discount through PayPal so the cost is $110 shipped within the U.S. for forum members. I haven't gotten around to listing them on eBay yet.

I also have some B4 lenses, the Polish adapters, and a Hirose cable / battery system to power the lenses. I would like to start a new thread to list what I have for sale but I'm not sure what's allowable / not allowable in this forum as far as listing "for sale" items goes. Thanks.

@ed_lee83 "The GH2 plus its Ex Tele function is simply the best cam to use with these broadcast zooms" 2.6x crop means 2.6x more visible noise and 2.6x deeper depth of field. It's very washed out and milky wide open in Ex Tele mode. It's better down to about f/4 but in low light it's better to use the built-in 2x extender. I shot this wide open with a 14x B4 lens and the built-in 2x extender, wide open.

@ed_lee83 No, I'm using the $300 Polish adapter on the GH2. The $800 one is to spread the image across the Canon APS-C sensor and even then you still need to engage the 2x adapter. I don't think it's even for sale to the public yet.

I don't know the ISO on this footage because I was using Auto ISO but I know it went pretty high at times.

The depth of field is 2x and with 1:1 crop mode it's 2.6x -- so yeah not that different. (Actually compared to 2/3" camcorders, the depth of field is actually the same on full sensor and 1.3x with ETC !)

I not been able to use the B4 lenses wide open in 1:1 crop mode myself, mine all look washed out, especially bad at wide angles. Which broadcast lens models do you find to be the sharpest wide open in 1x / ETC ? Do you have any wide open footage to share?

@ed_lee83 OK I thought we were discussing B4 2/3" lenses. The ones I've tested, Fujinon, Canon, Nikon, all look milky at f/1.7 in the ETC mode. I'm not sure what the deal is because they were obviously intended to be usable wide open originally. The Fujinon 7.5-105 f1.4 sounds like a 1/2" lens. I bought one on eBay in B4 mount, a Canon 7-105mm 1.4, but the backfocus was wrong. It had a shorter flange distance than the 2/3" lenses & it didn't focus at all using the MFT adapter. I didn't think I could modify it so I sold it. I pretty much gave up on searching for the holy grail in c-mount lenses because almost all of them vignette on the full sensor. ETC mode is a nice feature but only the full sensor gives you the full latitude of dynamic range that the camera is capable of.

My goal right now is to find someone to produce a B4 to Canon EF adapter. Then I can use a Canon 2x tele-converter to provide full coverage of the 4/3 sensor. My tests have shown that a Canon 2x tele-converter improves the edge sharpness over the built-in 2x extender which wasn't originally designed to cover such a large sensor.

Of course it would have to be designed with precision accuracy to get the back-focus correct for infinity focus. If you know anyone who might have this capability please put them in touch with me via pm. Thanks

@Turbodog Here's a B4 to Canon adapter? http://www.ebay.com/itm/B4-2-3-ENG-FUJINON-Canon-lens-EOS-550D-7D-60D-T2i-600D-T3i-adapter-/250965944814?pt=LH_DefaultDomain_0&hash=item3a6ebc69ee

This video, shot with a Fujinon 14x 8.5-119mm f/1.7 lens was embedded in an eBay listing. Cameras used were the GH2 and AF100. It's sharp, and with the 2x extender engaged, it covers the entire sensor.

Then I am curious to know why you would sell such a supposedly nice lens. ;)

Actually the sharpness looks good to me, but I don't care for the overall look. I can't put my finger on why. Maybe the contrast is too low or there are aberations. I take it these lenses were for SD cameras.

Yes I have a number of them, plus the MFT adapters -- something I buy and sell. They were for SD video cameras but it is professional grade glass that still holds up quite well. With fixed aperture, parfocal zoom (stays in focus across the whole zoom range), step-less iris (no click stops) and macro. Plus you can power the zoom servo with the cable I made & the battery doubles as a 6400mAh external battery for the GH2. Not as sharp or with bokeh as nice as an SLR lens, but still you get a lot of versatility with these lenses. Sharpens up as you stop it down.

A nice solution to the problem of slow variable aperture, varifocus zooms without smooth mechanical zooming or step-less iris for shooting video.

@Roberto: I am interested in getting the same adapter do you have any pics of how your's mounted with the lens? Do you have any focusing issue with this adapter?

Thanks

@Turbodog did you already try the B4 to Canon EOS adapter with your Canon extender? I'm very curious as I read that the adapter is a replacement for the EOS mount. I am really looking for a B4 to Canon FD mount adapter like the Bumki version from 2010. Do you know where to get it?

@FW200 wow.. off topic: how did you connect the viewfinder. Is it the HDMI output of the GH2?

@FW200 what a gr8 setup you have, on the other side is there a sound recorder or what?

too bad that gh2 hdmi does not have output on other modes, just 24p

also you could connect the eng lens REC button from the hirose connector to the GH2 remote jack

@Ebacherville

 im always using faster lenses than a ENG in 2x can provide

A lot of ENG lenses are fast. My Fujinon is f1.7.