VSM vs. Speedbooster at DVinfo.net

Ed Kishel · April 5th, 2016, 11:47 PM

So I tried using my SB with my old Nikon primes and hoped that there was enough sensor coverage to keep the VSM at 100% and still take advantage of the extra f-stop. Unfortunately to get rid of the vignette I had to set it to 92%.

Would it be better to use a normal adapter to avoid image scaling and stay at 100%? Or would you have to pixel peep to see the difference between 92% and 100%. I won't be able to do any of my own testing for a few days- but wanted to see what other owners thought until then.

=^_^=

Duncan Craig · April 30th, 2016, 04:09 AM

92% sounds pretty good. I expect your speedbooster is only designed to cover a micro four thirds sensor.

If you look at this page: Metabones® you can see that Metabones recommend a setting of 86%.

What SB do you have by the way?

I'm in the market for new lenses and maybe an SB too, but I think that having to set the VSM down to 86% almost negates the SB's affect on the focal length, although the additional light gathering will still be useful.

Duncan.

Lee Powell · April 30th, 2016, 12:08 PM

Rokinon 35mm and 85mm T1.5 primes can handle the 0.7x SpeedBooster at 100% VSM without vignetting.

Duncan Craig · April 30th, 2016, 02:18 PM

In that case you'd expect all the Rokinon Full Frame lenses to do the same or similar...
I really think I should buy them.

April 5th, 2016, 11:47 PM	#1
Ed Kishel Regular Crew Join Date: Apr 2008 Location: Phoenix, AZ Posts: 80	VSM vs. Speedbooster So I tried using my SB with my old Nikon primes and hoped that there was enough sensor coverage to keep the VSM at 100% and still take advantage of the extra f-stop. Unfortunately to get rid of the vignette I had to set it to 92%. Would it be better to use a normal adapter to avoid image scaling and stay at 100%? Or would you have to pixel peep to see the difference between 92% and 100%. I won't be able to do any of my own testing for a few days- but wanted to see what other owners thought until then. =^_^=

April 30th, 2016, 04:09 AM	#2
Duncan Craig Major Player Join Date: Jul 2003 Location: Leeds, UK Posts: 660 Images: 10	Re: VSM vs. Speedbooster 92% sounds pretty good. I expect your speedbooster is only designed to cover a micro four thirds sensor. If you look at this page: Metabones® you can see that Metabones recommend a setting of 86%. What SB do you have by the way? I'm in the market for new lenses and maybe an SB too, but I think that having to set the VSM down to 86% almost negates the SB's affect on the focal length, although the additional light gathering will still be useful. Duncan. __________________ FCPX/LS300/EX1/FS100/GoPro/Vinten/HotHead/Jib/Track/Dedos/Lightstorm/Coollights

April 30th, 2016, 12:08 PM	#3
Lee Powell Regular Crew Join Date: Jun 2015 Location: San Francisco, CA Posts: 133	Re: VSM vs. Speedbooster Rokinon 35mm and 85mm T1.5 primes can handle the 0.7x SpeedBooster at 100% VSM without vignetting. Last edited by Lee Powell; April 30th, 2016 at 02:48 PM.

April 30th, 2016, 02:18 PM	#4
Duncan Craig Major Player Join Date: Jul 2003 Location: Leeds, UK Posts: 660 Images: 10	Re: VSM vs. Speedbooster In that case you'd expect all the Rokinon Full Frame lenses to do the same or similar... I really think I should buy them. __________________ FCPX/LS300/EX1/FS100/GoPro/Vinten/HotHead/Jib/Track/Dedos/Lightstorm/Coollights