Re: Sony F5/F55 Pricing
 

I believe the MTF B4 to F3 mount you developed with MTF will already do this, but not using the 2x extender built into the lens? What am I missing?

Also do you know if it is possible to use a pure mechanical B4 to F3 or PL mount adapter with no magnification in the adapter, and only use the 2x magnifier.

So I am posing two scenarios.

Re: Sony F5/F55 Pricing
 

Just using the 2x extender fills an area around 3k pixels wide, using the 1.4x in the adapter only fills about 2k pixels wide (not enough pixels for full HD resolution). So we are looking to build an adapter with approx 1.6x magnification so we have as little magnification as possible to get the deepest DoF and less than 1 stop of light loss. You could use a purely mechanical mount adapter and just the lenses extender, but DoF will be shallower than will be possible with a less strong magnifier.