Helios-44m 2/58 lens for SLR camera M42 mount KMZ USSR Zenit

Helios-44m, black lens for SLR camera 58 mm, f/2, M42 mount, s/n 7861_929 Krasnogorsky Mechanical plant (KMZ), Krasnogorsk, USSR Sold as not working (for parts). Lens does not have an "A-M" switch. Aperture does not react to rotating the aperture ring and partly closes when pressing the "jumping diaphragm" pin. Lens does not have any fungus, front glass has many strong cleaning microscratches. Inside there are microspecks of dust. Focus ring rotates tightly, aperture ring rotates easily and has a big backlash. Body has strong signs of age and use. Two screwbolts are absent at the rear side. Aperture blades have rust. Camera "Zenit-B" is not included and shown as an example of mount. This lens was designed at Krasnogorsky Mechanical Plant. This is a representative of vast "Helios-44" family, that was based on German Carz Zeiss Jena Biotar 2/58. Firstly it has a name "BK" - Biotar from Krasnogorsk. Optical scheme was calculated in 1951 at State Optical Institute. Lens was produced in 1958-94 at three plants: KMZ, BelOMO, Jupiter with four possible mounts: M39, M42, Pentax-K mount, Start. This is one of the most popular lenses in the world. This version has 8 rounded blades. This lens has a jumping diaphragm. Red letter "R" on the body must be put when taking picture on infra-red film. Lens has a switch "A-M" (A - for automatic and M - for manual aperture control). When mounted with adapter on Canon, for example, its focal distance will be: 92,8mm (for APS-C), 75,4mm (for APS-H). Lens s/number - 7861_929 Number of lenses - 6 in four groups, Biotar Angle of view - 40o Number of aperture blades - 6 Limit of aperturing - 1:2 (max), 1:16 (min) Resolving power - (centre/edge) 38/19 lines/mm Minimal distance of focusing - 0.5 m Type of thread - M42 mount Type of thread for the nozzles - 52 mm Dimensions (mm): 42*60*60 Focal distance - 58,60 mm. Mass - 292 g One-layered anti-reflection coating ---------- Conditions: Economy shipping to the address stated at Pinkoi with tracking number, usually sent within 3 business days after payment. See the photos for details. Photos are actual - that is exactly the lens you will receive. Please, do not hesitate to contact me for any information required. Please, watch my other items. I combine shipping - write to me what items do you want to buy, and I will calculate the discount for combined shipping. Package is packed thoroughly and carefully and marked as a “gift”. If you need to add invoice in the envelope or not to mark as a “gift”, write to me. If you are interested in terms of shipment - write to me, and I will tell the minimum, maximum and average time of shipment to your country (I accumulated vast statistics). Return shipping (if the item is as described in the ad) is paid by the buyer. My price include the item and shipping cost and does not include Duties, Value Added Taxes, Customs Clearance Fees and other charges. These charges are the buyer's full responsibility. Please check with your country's customs office to determine what these additional costs will be before bidding/buying. Buyer needs to pay for the above fees in case that occurred for certain goods. If the package returns back to me due to the buyer refuse to pay those fees, I would not send the package again unless the buyer completes those fees and pay all the return and resend cost. Buyer can not cancel the order or request refund due to this reason. All the customs clearance and other affairs that can be necessary to get the package in the buyer’s country is buyer’s full responsibility. Please, be sure that you are aware of your post office working time, order and rules of package delivery and be ready to accept the package. If the package returns to me as “unclaimed” or the tracking system shows “unsuccessful delivery attempts”, refund to the buyer will be paid deducting the shipping and return costs. Resending must be paid extra.