Does the Brevis work for both DVX and HVX?
- Thread starter Saiaf
- Start date
Christopher Barry
Veteran
Christopher Barry
Veteran
There is also a Spacer Ring, depending on your lens speed (f-stop), although the "L" diffuser may obviate that, such as CF1L, instead of a CF1. For DVX/HVX, go CF1L to get started.
marco0782
Well-known member
Get CF1 if you will be using wide lenses up to a 100mm or so. Anything longer than 100mm will vignette. Alternatively, you can get CF1L to eliminate vignetting on the longer lenses but anything wider than 35mm will vignette.
In terms of vignetting, I use a 135mm f2.5 with my CF1 and I find it almost not noticeable. However when using my 200mm f4.0 the vignetting is too much. Similarly you can probably get away with slight vignetting on the 35mm when using the CF1L but you will get a lot of vignetting on a 20mm.
With the proper diffuser for a given application the Brevis has even edge to edge brightness unlike the M2 which vignettes no matter what you do.
I would highly recommend the 22mm spacer ring for both the DVX and HVX because it gives you better edge to edge focus on the diffuser.
In terms of vignetting, I use a 135mm f2.5 with my CF1 and I find it almost not noticeable. However when using my 200mm f4.0 the vignetting is too much. Similarly you can probably get away with slight vignetting on the 35mm when using the CF1L but you will get a lot of vignetting on a 20mm.
With the proper diffuser for a given application the Brevis has even edge to edge brightness unlike the M2 which vignettes no matter what you do.
I would highly recommend the 22mm spacer ring for both the DVX and HVX because it gives you better edge to edge focus on the diffuser.
Last edited:
Beat Takeshi
Two-Hip Shakur
I use it with both all the time all you need is the step down ring for the HVX and you are good to go. You can find examples on my site. www.puffinfilms.com 
Christopher Barry
Veteran
Marco, I have been using CF1,2 and 3. I find my Nikon 85mm and 105mm need to be mostly wide open or vignette occurs. I have CF1L and others on order, so I have not tested these yet, though I should get some improvement with my aforementioned longer lenses. Surprisingly, I have a Sigma 135-400mm D lens, which allows me to stop down to f16 without any vignette, using CF1. I am not impressed with the sharpness of this lens.
I did not realise that CF1L may cause vignette on the wider lenses. More testing in due course, on 18 - 35mm primes.
I did not realise that CF1L may cause vignette on the wider lenses. More testing in due course, on 18 - 35mm primes.
Christopher Barry
Veteran
Marco, I personally like CF3, the DOF and bokeh is more pronounced, however, there is a need to have really fast and fully open lenses.
Once CF2 or CF2L are released as a one piece diffuser, I am earmarking it as the most permenantly installed diffuser, as most of my prime lenses are about f2 range, which probably suits more use with CF1 and CF2.
I can not make a specific comment about light loss from actual tests, as I have always shot different footage, never a constant for comparison, so I would be guessing. Quote from Dennis: "CF3/CF3L has approx. twice the diffusion level of CF1/CF1L, which changes the quality of bokeh." CF2 appears somewhere in between. I have not observed any additional vignetting issues between CF1,2 and 3.
Once CF2 or CF2L are released as a one piece diffuser, I am earmarking it as the most permenantly installed diffuser, as most of my prime lenses are about f2 range, which probably suits more use with CF1 and CF2.
I can not make a specific comment about light loss from actual tests, as I have always shot different footage, never a constant for comparison, so I would be guessing. Quote from Dennis: "CF3/CF3L has approx. twice the diffusion level of CF1/CF1L, which changes the quality of bokeh." CF2 appears somewhere in between. I have not observed any additional vignetting issues between CF1,2 and 3.