FS7: My FS7 rig as of Summer 2016

[brianc1959]

Is that a graph from Metabones?

Only over the years they have said A LOT of things about their adapters...

Its a graph that I plotted using data measured on the Lens Rentals MTF bench (thank you Roger Cicala!). I generally prefer calculated MTF curves since they represent the true performance limitation, but in this case I had no prescription for the Zeiss Otus - just the actual lens. Most of the optics information from Metabones comes from me. My company works with two other companies to design, manufacture, qc, and sell the optical core for all Speed Boosters to Metabones, who then integrates it into their adapters.

 

[Ben Scott]

Fair enough Brian, wasn't meaning to take a pop at your work as it is most of the elements aside from the optics from Metabones - ie the electronics - that have caused people headaches over the years.

That said I stand by my broader comment that the Otus 55mm is the best non-cine lens I have used with the most controlled CA and contrast and it makes no sense to me to then try to some other glass which will further shrink and squeeze it before it hits the sensor.

I find focal reducers to be a wonderful solution to making an f2.8 medium-wide to telephoto zoom faster and giving more framing options. They're not much use to me when already using fast, sharp primes.

 

[Martin.G]

I cant live without the Speedbooster Ultra for my Sigma 24-105 Art. Without it, its a 38 lens. Not nearly enough wideangle, and the Sigma 18-35 is not nearly as flexible.

But is there plans to reduce the heavy CA in an updated version @brian?

My company works with two other companies to design, manufacture, qc, and sell the optical core for all Speed Boosters to Metabones, who then integrates it into their adapters.

 

[JPNola]

That said I stand by my broader comment that the Otus 55mm is the best non-cine lens I have used with the most controlled CA and contrast and it makes no sense to me to then try to some other glass which will further shrink and squeeze it before it hits the sensor.

I hear ya', Ben. It is akin to the age old debate about UV filters. I can see how one might want the image hitting the sensor to be pure Otus with no other players stepping in there.

 

[brianc1959]

Fair enough Brian, wasn't meaning to take a pop at your work as it is most of the elements aside from the optics from Metabones - ie the electronics - that have caused people headaches over the years.

That said I stand by my broader comment that the Otus 55mm is the best non-cine lens I have used with the most controlled CA and contrast and it makes no sense to me to then try to some other glass which will further shrink and squeeze it before it hits the sensor.

I find focal reducers to be a wonderful solution to making an f2.8 medium-wide to telephoto zoom faster and giving more framing options. They're not much use to me when already using fast, sharp primes.

If you want to shoot super-fast optics on an FS7, the Otus series plus a Speed Booster is almost certainly better than any other f/1.0 option available. Making the Otus faster and sharper is not such a bad thing!

 

[brianc1959]

I cant live without the Speedbooster Ultra for my Sigma 24-105 Art. Without it, its a 38 lens. Not nearly enough wideangle, and the Sigma 18-35 is not nearly as flexible.

But is there plans to reduce the heavy CA in an updated version @brian?

The Speed Booster Ultra (both APS-C and m43 variants) is very well corrected for both axial and lateral chromatic aberration. They even work well into the deep violet and near infrared. Are you sure you aren't just seeing something that is inherent in the non-boosted lens?