Century via Schneider Optics Canon and Nikon Speciality PL Conversions

[Ken Robings]

Still working out the details Phil, Red will show some of my mounts under glass, but Red has not tested the 1.2x extender yet. I will bring one with me to the Red party Sunday night (but not a Cooke 5 to 1). I will get the new Dropbox photo gallery up in the next day or two, so you can see the uncompressed tiffs, and post a link. There are a couple of jpegs at 25mm (where the barrel goes to pincussion on the Cooke) in my picture gallery here on Reduser.

 

[Phil Holland]

Good stuff. Looking forward to seeing them. Are we looking at a 1/4 or 1/3 stop light loss? Sounds like it would be nominal.

 

[Ken Robings]

I just posted two screenshots from the Cooke test on my gallery here on Reduser. It shows, at 20mm, same f8, that there is slightly over 1/2 a stop loss with the 1.2x extender (20% on the waveform equaling one stop). As you know the 1.4x is a full stop, the 2x two full stops. This is what I expected when I started, very hard to cheat physics.

 

[Phil Holland]

Ah. I was hoping for a miracle Half is alright. That's not really that big of a deal if it's allowing for coverage and Dragon's giving us solid ISO 2000+ imagery. I think it's a smart product. Especially for those who have things like old Standard Speeds that don't cover past S35. Smart stuff.

 

[Jacek Zakowicz]

I seriously doubt that it would work on lenses that protrude as far back as the standard(or super) speeds...
Ken do you care to clarify?

 

[Ken Robings]

Jacek, right, this is for certain zooms and longer focal lenses, not sure what the shortest fl is yet for the primes. I have a list of zooms on a pdf on the Cooke test, I will try to add that to my gallery here on Reduser. The short list so far;
Angenieux 25-250 HR, 24-290, 17-102
Cooke 20-100, 25-250 Mk III
link to Dropbox with larger Jpegs and movie (of test chart), working on Tiff gallery;
https://www.dropbox.com/sc/y6l0bzu9qwnwdlo/u6lNkWPQxx