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|Maximum format:||35mm full frame|
|Diagonal angle of view:||46.8° (35mm full frame)|
|Lens construction:||6 elements in 5 groups|
|Closest focusing distance:|
|Number of diaphragm blades:|
|Maximum diameter x Length:||Ø67 x 44 mm|
|Materials:||Metallic barrel, metallic mount|
|Filter size:||62 mm|
Design and Features
The RE GN Topcor M 50mm f/1.4 lens (and the RE GN Topcor 50mm f/1.8 lens) have been designed as universal use standard lenses of the highest performance and are representative of the high Topcor quality in optics. Both are modified Gauss type optical designs for obtaining superior optical performance and depiction.
However, one of their most outstanding features is automatic flash settings, obtained simply by setting the guide number of the flash bulb or electronic flash unit to the GN scale - which automatically sets the correct exposure as the subject is focused. The frustration of having to calculate the correct f/ number for the focused distance, as in the case of other lenses, has been completely eliminated from flash photography, and, together with the Auto Winder, brings greater mobility to the photographer.
|User Manual. English, Adobe PDF, 379 KB|
Alternatives (MF, 44..56 mm)
|Cima Kogaku RE Topcor 55mm F/1.7||⊗|
|Tokyo Kogaku RE GN Topcor M 50mm F/1.4||1973||⊗|