A scope to go as wide as possible on full frame?

[rokkimort]

I saw a lad posting on facebook, that he's using a 40mm pancake lens on a full frame camera with Kowa B&H. That's pretty sweet if you ask me.

If money were no issue, what scope (1.5-2x stretch, 1.33 seems pretty pointless to me) could one buy, to be able to go the widest on full frame (get the widest FOV after 2.4:1 crop)? I own sony A7S, and there's a lot of 35-45-50mm glass I'd love to use with scopes.

Iscoramas? Kowa B&H? Inflight? Bolex?

[Tito Ferradans]

The widest you can possibly go is 28mm + Panasonic LA7200. That matches 21mm horizontal FOV.

Jesse's solution on facebook, with the 40mm and B&H, at 2.4:1 equals a 30mm FOV

at 2.66:1 you can use a 40mm and an Iscorama (1.5x) goes to 27mm.

There's lots of variables. You'll probably have fun with my calculator: www.tferradans.com/anacalc/go

[HockeyFan12]

I have a wide angle adapter I had machined to fit on my ISCO pre-36. With a 35mm lens it's somewhere around 17.5mm horizontal FOV equivalent. But you can't use diopters. Probably going to sell it eventually, but this is a good option for anyone willing to put in the time. 

[dahlfors]

On 20/03/2017 at 2:40 AM, Tito Ferradans said:

The widest you can possibly go is 28mm + Panasonic LA7200. That matches 21mm horizontal FOV.

Jesse's solution on facebook, with the 40mm and B&H, at 2.4:1 equals a 30mm FOV

at 2.66:1 you can use a 40mm and an Iscorama (1.5x) goes to 27mm.

There's lots of variables. You'll probably have fun with my calculator: www.tferradans.com/anacalc/go

What 40mm doesn't vignette on an Iscorama? My 50mm Nikon lenses seem to vignette just a little bit.

[Tito Ferradans]

The Canon EF 40mm f/2.8 doesn't. It impresses me every time, but works. I might get a tiny little bit on the edges, it's been a while since I used the combo, I don't remember if it's 100% clear.