Visoflex-Apo-Extender

[UliWer]

Advertisement (gone after registration)

I was sure this wouldn't work.

I asked myself what the results of longer Visoflex lenses were if one added the Apo-Extender-R 2x.

So I took my Telyt-V 1:5/400mm, added a 16466, then a Visoflex-to-R-Adapter 14127, then the Apo-Extender-R 2x and the R-to M-Adapter on an M10 MonochromThe whole my thing looks like this:

Welcome, dear visitor! As registered member you'd see an image here…

Simply register for free here – We are always happy to welcome new members!

 

 

When I tried looking at the camera's rear screen I found a brickwall at approximately 40m distance. Fokus peaking worked:

And that's the Telyt 400mm field of view without extender:

 

 

[UliWer]

Of course the 400 Telyt is a real beast and the combination of adapters and extender adds more than 500g which makes it extremely clumsy to handle.

Compared to this the 1:4.5/200 Telyt is a lightweight.

First the field of view from the 200mm Telyt on minimal focal distance of 3m:

Welcome, dear visitor! As registered member you'd see an image here…

Simply register for free here – We are always happy to welcome new members!

Now with the Apo-Extender combination as described above - same distance, focussing unchanged:

 

Of course the Apo-Extender 2x makes a 1:9/400 out of the Telyt which isn't very usefulf.

So let's create a "Apo-Hektor 250mm". First the 1:2.5/125mm Hektor with Visoflex at minimal focussing distance of 1 m at f/2.5:

 

Now the Hektor 125mm still at f/2.5 with the combination for the Extender (equals f/5)- position slightly adjusted to reach MFD:

 

[UliWer]

I wasn't sure whether the whole combination really worked on infinity. The full moon was helpful.

Telyt-V 1:5/400mm at f/8 and infinity with adapters and Apo-Extender-R 2x (no crop):

Welcome, dear visitor! As registered member you'd see an image here…

Simply register for free here – We are always happy to welcome new members!

Certainly not the sharpest moon you have seen with 800mm.

 

Edited May 11 by UliWer

[sandro]

Uli what a fascinating and exciting test you showed us! It shows the quality of these lenses once more and also how they keep up performance with all the added adapters. Indeed not the most versaitile combinations, as you already mentioned.

Lex

[jankap]

Of course, it worked. With the extender one selects the middle part of the lens, the best part (see the MTF curves). Of course, the extender adds more glass in the light path, but its optical quality is very good.

I have good results with focal reducers from Metabones used with APS cameras and R and EF lenses. Only with the Elmarit R 15 mm, the results were disappointing.