How To Adjust the Back Focus of your B4 Lens
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- Опубликовано: 9 фев 2025
- In this video, Bohus shows you how to adjust the back focus of your B4 Lens for use with the B4 Magic lens adapter from Fotodiox.
Click here to download the focus chart: www.mediacolleg...
Want to add a powered zoom lens to your Blackmagic Pocket Cinema Camera? Now you can with the B4 Magic Lens Adapter and PowerLynx Kit from Fotodiox!
To date, connecting powered zoom lenses to modern cameras has been more trouble than it’s worth, but the PowerLynx Kit makes it easy and affordable. What’s more, you’ll be able to combine the smooth, cinematic effects of B4 ENG lenses with the amazing power of your Black Magic Pocket Cinema Camera.
Click here to buy the B4 Magic adapter: www.fotodioxpr...
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Hmmmm. The place where i work made some "cleaning", and they didn't needed it anymore, as we are working with newer systems now, so i got a Canon b4 lens simmilar to yours, but this one is a model without that sweet extender. For me it's still okay to play with, as my GH5 kinda fix it with the teleconv. I also got the adapter, but it seems like i just can't work out the back focus. Did a lot of times in my job (truth to be told, with sony cameras with the right mount), so i feel a bit funny, that this seems impossible with the gh5. You think the m4/3 sensor and/or using the teleconverter doing this, or it's just needs some more hours to find the sweet spot?
It can be tricky, and it's possible that the lens you have may have been damaged or have some loose optics that don't stay locked in or creep out of focus. These are old lenses.
Hi, B4 Canon Lenses are so good like Cine Canon Lenses in a 60D or 5D Canon Dslr cameras?
Will you have one for the Samsung NX1 out soon?
Hi Edward,
We are looking into the possibility of creating versions of the B4 Magic for other cameras and mounts. Stay tuned!
Will this lens adapter work on the JVC LS300, which is a S35 sensor and MFT mount? I could use the b4 to MFT mount you also sell, but this adapter looks as though it has an additional element built in which probably yields a better image.
Thanks
Hi postprod09, our B4 Magic adapter is made expressly to fit a 2/3" B4 lens's image circle onto a Super16 size sensor. With the JVC LS300's much larger S35 sensor you'll still get a lot of vignetting--you'll see the whole image circle. You'll see in this video that you'll start to get vignetting even on an MFT sensor: ruclips.net/video/P2qRimxi69A/видео.html
Thanks. Any plans on making one of these?
Do you have adaptor for Blackmagic Studio Camera HD to B4 Canon lens?
XTOTVEnlaceBolivia Our B4 Magic adapter is made for the sensor size of both the Blackmagic Pocket and Studio cameras, so it should work well on your camera.
Is there an adapter for dslr for example a 5d mark3 or a canon 70d ?
+AmericanFlySociety Unfortunately we don't currently offer a B4 to Canon EOS lens adapter.
Hey,
Would the b4 adapter work on a MFT black magic cinema camera. from what I heard the sensor is a bit larger, would the b4 still work??
julian mojica Hi Julian, you're correct. The sensor is larger in the Blackmagic Cinema camera and you'd get some major vignetting with our B4 Magic adapter, which is made expressly for the smaller sensor in the Blackmagic Pocket Cinema and Studio cameras.
Is it possible to get a very sharp video with a Canon 14X 8-112mm f/1.7 on a GH4 as I can get or close to a prime lens? Also I noticed that even that it's a f1.7 it sucks in low light. any insight?
We don't recomend shooting under f/5.6 with the B4 Magic adapter because the built-in enlarging optic will add softness to the image. It is possible to use one of our non optic B4 adapters on your GH4 though, which would let you shoot wide open with less softness. Here's a video we made showing different options for mounting B4 lenses on the GH4: ruclips.net/video/P2qRimxi69A/видео.html
Thank you for the info.
I buy one B4 kit but not compatible for my lens Canon VCL-719bx. it has some solution?
+PROMAX Produções That's a 1/2" sensor B4 lens. Our B4 Magic adapter is made expressly for 2/3" sensor B4 lenses.
exists this adapter?
PROMAX Produções We do not currently offer an adapter for that kind of lens and we're unaware of anyone else who does.
+Fotodiox Inc I find that it goes to be more easy to arrange a lens of 2/3. debtor for the replies.
Do you have a b4 adapter for GH4 or that works well on it?
+Sandro Brito Currently not. If you used our B4 Magic adapter on a GH4, you'd have to shoot in crop mode, and even then you might get a bit of vignetting.
+Fotodiox Inc what about with your mft adapter? www.fotodioxpro.com/b4-mount-lenses-to-mft-mount-mirrorless-camera-pro-adapter.html
+Sandro Brito With that adapter you'll get even more vignetting because there's no enlarging optic.
+Fotodiox Inc great, that's what I needed to know. Thanks for the reply
I'm sorry to butt in, but I have a question. A 70 feet distance at a 5.6 stop will give you a huge depth of field. Shouldn't we minimize the depth of field while adjusting back focus? Thank you.
Yes, stopping your lens open all the way will help you fine tune focus. The reason we recommend staying at f/5.6 with the B4 Magic adapter is because the optic in the adapter adds extra softness to your image if you open the lens wider than f/5.6.
I see. Thanks for the response!
@@FotodioxInc Sorry but this is not how it is done. I don't know who taught you this but they were making stuff up.
You should remake this or take it down.
You zoom in
then use the main focus ring to make the target sharp
then zoom out and adjust with the BF ring to make sharp then lock it in place.
Sorry but this is not how it is done. I don't know who taught you this but they were making stuff up.
You should remake this or take it down.
You zoom in
then use the main focus ring to make the target sharp
then zoom out and adjust with the BF ring to make sharp then lock it in place.
😂 who is this guy?!
canon vcl 719bx and Panasonic gh5s - it's realy?
What are you asking?
@@FotodioxInc send me mail plz 812gorod@gmail.com ? i send for you foto with camera and lens. Is it possible to combine them.
@@812gorod Okay, we'll send you an email shortly.