$65.0 Buy It Now or Best Offer
free,30-Day Returns
Seller Store ussruser
(304) 100.0%,
Location: Europe
Ships to: US,
Item: 255399898477
Restocking Fee:No
Return shipping will be paid by:Buyer
All returns accepted:Returns Accepted
Item must be returned within:30 Days
Refund will be given as:Money Back
Compatible Brand:For Zenit for Praktica for Pentax
Maximum Aperture:f/2.8
Mount:M42
Focal Length:50mm
Year Manufactured:1980s
MPN:805820
Exterior Material:Aluminum
Industar:Industar
Series:industar 61
Type:High Quality,Macro/Close Up
Compatible Lens Front:52 mm
Focus Type:Manual
Manufacturer Warranty:None
industar 61 2.8/50:industar 61 2.8/50
Camera Technology:Film
Compatible Filter Size:52 mm
Country/Region of Manufacture:Russian Federation
Focal Length Type:Fixed/Prime
Lens INDUSTAR-61 L/Z 2,8/50mm Russian SLR lens (Pentax, Praktica, Zenit) M42 Good condition! Works good. See photo! Industar lenses used the Tessar optical scheme. Industar-61 L / W calculated by Academician G. Slyusarev and V. Sokolova. L / W – briefly in the USSR for a mass objective, namely in indistar-61, for the first time began to massively apply superheavy crowns of glass, STK-6 or Lantan. Do not think that all the glasses at the lens are made of heavy glass, in this scenario Patzvel’s conditions will not be met. Namely, positive lenses, in our case, two of them, should be from a heavy grade – crowns. The other two lungs are varieties of flint. Crones have a small refractive index and they have a large dispersion. Flint, on the contrary, the refraction is high, the variance is low. In the role of heavy crowns, a comparatively rare lanthanum was used, which is twice as heavy as ordinary glass in equivalent sizes. All items are shipped by airmail.Delivery time is estimated on eBay, but is not guaranteed and may change, especially during peak periods. Delivery time: Europe 10-30 days, Asia 30-50 days, USA 20-45 days, Australia Indonesia 50-65 days. Specifications: Lens: ” INDUSTAR-61 L/Z” 2.8/50 The focal length is 50 mm. The maximum aperture is 2.8. The minimum aperture is 16. The number of petals of the diaphragm is 6. Number of lenses / groups – 4/3. The minimum focusing distance is 0.3 m. The resolving ability of the center / edge is 42/30 lines per mm. Light transmission – 0,90. The working section is 45.5 mm. Manufacturer: Lytkarino Optical Glass Factory (LZOS) Fixing optics – M42 Simplicity is the key to success, there is no hopper in the lens. The diaphragm is controlled directly by the ring, without springs and levers. Hence the impeccable work of the diaphragm, which is not, it does not break and will not get stuck like in the Tessar zebra. For convenience, the lens has a reliable aperture pre-setting system. In fact, the stopper closes the diaphragm.
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