Legendary and most likely the most famous portrait lens produced in the USSR. Helios-40 is one of the most discussed lenses in photo forums. The fault of everything was an unforgettable drawing, characteristic twisted side on an open diaphragm. The pro-image was the German lens Carl Zeiss Bio tar 75/1.5. According to the optical scheme, the lens refers to Planar (modification with thickened elements). The formed image has a characteristic "warm" shade, rather sharp in the center of the frame on f/1.5, but low-contrast.
Focal length 85 mm
The diaphragm type is iris
Number of diaphragm petals 15
The diaphragm 10 is maximum
The minimum focusing distance is 0.8 meters
Number of lenses/groups 6/4
Resolution center edge 32/16 mm
Enlightenment - single layer
Threaded attachment to camera M39
Working section - 45.2 mm
Thread for 66mm light filters
Ergonomics and construct:
Looking at the lens, only reinforced concrete structures come to mind. Everything is very reliably assembled, nothing talks inside. It consists of glass and aluminum. The lens has an additional ring for pre-mounting the diaphragm. The diaphragm ring itself is located in front of the lens, and the pre-installation ring is located in the middle. At the same time, the pre-installation is very convenient, as its ring has a large weight. This is one of the few lenses where it is really convenient to use the diaphragm pre-installation ring. The focusing ring has a smooth stroke. A disadvantage of the lens is that the sharpening ring is set too close to the camera bayonet. The Helios 40 lens diaphragm consists of ten petals. The specific shape of the petals provides a linear closure of the diaphragm. The petals themselves have matte blackening. At an intermediate value of Ф-1,5 to 2.0, the diaphragm forms a circle, followed by a polyhedral sprocket. The diaphragm pre-installation feature allows you to limit the maximum closing in advance. Helios-40 boasts adjustable tripod mounting; it is possible to photograph both horizontally and vertically while not detaching the lens from the tripod. The position changes very quickly and remarkably conveniently, the clamp lock releases or clamps the clamp, and the lens rotates inside it.
Optical properties and photo examples:
Given the narrow Depth of Sharply Depicted Space (GPR) at focus 85mm and light axis 1.5, it is necessary to have a focus hit the sensor, or the focus screen should be with Doden wedges. Ideally focusing on live view Otherwise there are difficulties getting into focus and there may be the impression that the lens is scary soap on open or generally softit. If the shooting conditions create a need to photograph in the background light, then be prepared for a drop in contrast. If the sun is right in the frame, you can see the flares in the color of siren enlightenment. Under normal shooting conditions, when the sun is behind the photographer's back, on an open diaphragm the contrast and sharpness are excellent. And of course the drawing on the open diaphragm, which does not give rest too many photo lovers. So clearly twisted Boke is difficult to meet, this property is a business card of the Helios lens system. And first of all, it is Helios-40. Very beautiful, plastic art pictures are obtained.Conclusion:
Helios-40 is a fast lens with its characteristic artistic picture, which will leave no one indifferent! The shortcomings of this lens are its uniqueness - lack of sharpness and its marked fall from the center to the edge, as well as calm colors and small backlights make photos interesting, airy, soft, and plastic. That's what Helios-40 loves for. His drawing is unique and aesthetically attractive.