I recently bought a new Rollei 1.4x Longar from B&H and it came, shrink-wrapped in a box labelled Longar, with a brochure labelled Longar, but the actual optic is labled Apogon.
Instead of "Schneider-Kreuznach AF-Longar 1.4x HFT System Rolleiflex 6000 Made in Germany", mine says "Rollei AF-Apogon Converter 1.4x HFT System 6000 Made in Germany".
Everything seems legitimate--the serial number of the unit matches the Test Certificate stamped by Rollei, etc., so I'm not concerned about any foul play--I'm more interested in the optical formula and performance of an Apogon vs. a Longar.
My research so far has revealed that the Longar is, in fact, a Schneider brand, and that the Longar was designed by Schneider specifically to integrate with the optics of the Xenotar 80/2.0, Tele-Xenar 180/2.8 and Apo-Tele-Xenar 300/4 (although it works with other lenses as well).
I cannot find any information on the Apogon 1.4x TC. It is a Rollei brand, and that's about all I know.
Can anyone shed some light on the Apogon 1.4x TC's optical formula, design, and/or history?
Much appreciated,
Brad