This is a 500mm f8 Samyang lens designed to mount on SLR cameras (35mm and smaller formats) using a T-mount converter. Focusing is manual (from infinity down to about 33 ft. if the lens is used without additional extension), aperture control is manual using the preset ring method. On a 35mm body this is a very long lens - on a digital camera with APS-C or smaller sensor it is an extreme telephoto, very useful for wildlife photography etc. This model is shorter than most 500mm lenses I've seen, which are usually close to 500mm long - this is about 330mm including caps. I think it's simply a more modern optical design. It's also much lighter, about 700g, in part due to the use of strong ABS plastics for parts of the barrel. I'm supplying it with front and rear caps and an M42 screw T-mount - if you would prefer a different mount please check with me, I have mounts for a wide range of 35mm cameras (but may not have rear caps for some of them). I don't have any mounts for mirrorless cameras. I don't have a suitable case or pouch for it.

This is mechanically and cosmetically good but there is light dust in the rear, probably fungus spores, and some cloudiness and fungus in the front element. This is reducing contrast slightly, and I recommend getting it cleaned if possible.

I took test pictures using a Canon Eos 600D camera with M42 adapter. All pictures except the last were taken at f11, 800 ISO. Weather was cloudy shortly before it began to rain.
Church 230 yards - 1/400th f11
Tree 30 yards - 1/200th f11
Bird bath 17 yards - 1/50th f11

White blossom about 15 yards - 1/160th f11

Moon, about 240,000 miles - 1/1250th f11, midnight, light cloud.

These lenses are made by Samyang and sold under Samyang's name and under several other brand names including Wallimex. There are reviews and tests on these sites:
https://engineerontour.com/samyang-500mm-f-8-review/
https://www.dpreview.com/forums/post/19419170
https://www.youtube.com/watch?v=zlh3SZudtTo
https://www.youtube.com/watch?v=hNBFWWtrvvc
 
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