9.6/10

Version Notes

This double Gauss Biotar design "special optic" (SO) lens was developed for the German Stasi surveillance camera (GSK), to focus through small openings. It has coatings to minimize infrared hotspot and it is also focus corrected for the infrared wavelengths.

Mount:

Year:

Type:

Focus:

Focal Length:

Aperture range:

Aperture Steps:

Blades:

Min. Focus:

Filter:

Optics E/G:

Weight:

Length:

Angle:

Hood:

M42

1970

Special Optics

Manual

50mm

f/2.8 - 16

(None)

None / 16

?m

None

?

?g

?mm

46°

No

Edward Noble

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