Spiratone Sharpshooter 400mm f/6.3 Kadlubek Objektiv-Katalog (2. Ausgabe) SPI0190 Cheap. simple formula 400mm lenses can be pretty good while still being very affordable. I personally feel (and lots of contemporary reviews agreed) that one of the best of these was the Spiratone 400mm. It is often confused with another 400mm* and miscalled a "Girl Watcher" but Mr Spira had more class than that even way back in 1961. In the ad, that table is from a Modern Photography test. This was also early on in the history of teleconverters, or TelXtenders™ as Spiratone later called them. _______________ *There is a review comparing the Astranar and the Spiratone: A tale of two teles: 400mm Astranar & Spiratone: Adapted Lens Talk Forum: Digital Photography Review in DPrevew. It's a good review but I'd take the Spiratone every time. I've bought the Spiratone for several friends and given others away as "party favors".