willie
November 29, 2014, 3:20pm
22
I used a bunch of Optolife aspheric a couple of years back. I was having trouble getting decent 50mm from Kaiodomain, Dino Direct and the usual suspects. Although not MG quality they were a significant improvement over most China glass at a reasonable price. The AR coating was a good option.
Lately I have been dissatisfied with the ”Aspherical” offerings from the usual Chinese suspects. Their 50mm and 75mm lenses had swirls, bubbles, multi-image with rejects running 4 to 1 good. I am into larger color emitters so p60 platform isn't what was needed. Found Optolife. Ordered several lens 50mm, 52mm & 80mm. The 50 and 80 rock for flashlight use. Dimensional and optical quality is first rate. The 50mm (A293) can be order with AR coating. The 80mm (A142) comes just plain Pyrex. I tried to…
Aspheric condenser Lenses
Steep aspheric lens surfaces produce large angles of refraction and hence short focal lengths. Aspheric lens surfaces can also be free from spherical aberration. For these reasons aspheric lenses produce highly efficient low f/number light condensers. They can be used to collimate or focus a lamp output or to collect radiation from a distant point and condense it onto a detector surface.
Tooling costs are lower because we do not use moulds.
We have competitive pricin…