Speedbooster/Focal reducer on a m43
Posted: 27 Oct 2020 09:20
Hello,
Does anyone have used a speedbooster on a m43 body ? I'm looking for a feedback in order to adapt my canon FD lenses on my EM10 mk3 body. I know that metabones and Viltrox are well known for this, but I only found speedbooster for Canon EF to m43 camera.
For those who don't know what a speedbooster or so called focus reducer does : it allows to reduce the crop factor by 0.71 and have a gain of 1 fstop of light.
For example if I use a canon FD 50mm f1.4 without a speedbooster on a m43, nut adapt it with a "dumb" adaptater I get a equivalent of 100mm f2.8 (I'm loosing 2 stops of light).
With the focal reducer with the same lens I get a 50 x 2 x 0.71 = 71mm focal with f1.0, which is very interesting. So I can use the same lens with 2 focal length (100mm f2.8 with dumb adapter and 71mm f1.0 with a speedbooster).
The question is how is the quality when you had a piece of glasses with the speedbooster ? Do you have a feedback on cheaper ones, metabones is very good by damn expensive imo.
Thank you,
Does anyone have used a speedbooster on a m43 body ? I'm looking for a feedback in order to adapt my canon FD lenses on my EM10 mk3 body. I know that metabones and Viltrox are well known for this, but I only found speedbooster for Canon EF to m43 camera.
For those who don't know what a speedbooster or so called focus reducer does : it allows to reduce the crop factor by 0.71 and have a gain of 1 fstop of light.
For example if I use a canon FD 50mm f1.4 without a speedbooster on a m43, nut adapt it with a "dumb" adaptater I get a equivalent of 100mm f2.8 (I'm loosing 2 stops of light).
With the focal reducer with the same lens I get a 50 x 2 x 0.71 = 71mm focal with f1.0, which is very interesting. So I can use the same lens with 2 focal length (100mm f2.8 with dumb adapter and 71mm f1.0 with a speedbooster).
The question is how is the quality when you had a piece of glasses with the speedbooster ? Do you have a feedback on cheaper ones, metabones is very good by damn expensive imo.
Thank you,