# Calling owners of the Canon FD 85mm 1.2L on Speedboosters

Started Apr 22, 2014 | Discussions thread
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Calling owners of the Canon FD 85mm 1.2L on Speedboosters

Owners of the Canon FD 85mm 1.2L on a Speedbooster, any comments?

Just been performing some camera math on the Canon FD 85mm f/1.2L as I hear this lens it very sharp wide open. Is this true?

If so, mounting this on a Speedbooster should create a 60mm lens which in theory translates into a lens with a 'full frame equivalent' of a 120mm f/2.4 but with light gathering ability of an f/0.85! (Maths below)

Given the maths, the price of this lens secondhand seems be reasonable compared to the Voigtlander f/0.95 series.

PHOTOGRAPHY MATHS :
(Tell me if I've made any errors!)

Camera Math Sources: Tony Northrup / Petapixel and Metabones Speedbooster White Paper

1. ORIGINAL LENS
Focal Length: 85mm (Field of view 85mm)
F-Stop: f/1.2 (Light gathering ability f/1.2)
2. LENS MOUNTED ON SPEEDBOOSTER
Multiply focal length and FoV by factor of x 0.71, reduce light gathering ability by 1-stop
Focal Length: 60mm (Field of view 60mm)
F-Stop: f/1.2 (Light gathering ability f/0.85)
3. LENS MOUNTED ON SPEEDBOOSTER ON AN MFT SENSOR
Multiple field of view AND f-stop by crop factor of x 2
Focal Length: 60mm (Field of view 120mm)
F-Stop: f/2.4 (Light gathering ability f/0.85)
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Wilkes
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