M42 lens - Carl Zeiss Jena, Meyer-Optik Görlitz, Jupiter, Helios, Pentacon, Cosina, Porst ....

Excellent build quality. Optically very equal. Sharp, nice colors. A copy of the Biotar. A successful copy. Optics: ★★★★☆ Sharp, nice colors. Bokeh happened to me not to the liking of. Ergonomics: ★★★★★ Perfection and comfort - what more could you want. Build quality: ★★★★★ Metal, as everything should be. Market value / value of subjective: ★★★★★ Less than $ 50 is a very good price. Links : Construction of Helios (photos): - http://www.cyberfoto.pl/tematy-ogolne/78784-budowa-heliosa-zdjecia.htm Here are some sample pictures. They were made with Sony Alpha 300. Pictures were taken with aperture F/4 ISO-400. Pictures were taken with aperture F/2 ISO-400.

The Triotar is a large lens and heavy. Very sharp. Focusing is difficult. Aperture Blades - 15 - beautiful bokeh. Max Aperture = F4 Min aperture = F22 Pre-set control with half stops between F4 and F22 Min Focus distance is under 1.2m Optical scheme: Triplet, 3 lenses in 3 groups Filter thread = 49mm Optics: ★★★★★ Sharp, sharp, sharp. Ergonomics: ★★★☆☆ It is difficult to focus because of the size and weight of the lens. The focus ring is not precise. Build quality: ★★★★☆ Heavy metal indestructible. Market value / value of subjective: ★★★★☆ Less than $ 150 is a very good price. Here are some sample pictures. They were made with Sony Alpha 300. Pictures were taken with aperture F/5 ISO-100 All photos without amendment in graphics programs. Pictures were taken with aperture F/4 ISO-100