Tamron Adaptall SP 500mm f8 (Model 55BB) for Pentax K p&s with its built-in lightmeter

with its built-in lightmeter

) Quite handy

this adapter provides a 180-degree diagonal angle of view with pretty decent image quality

Not sure how

Includes original case (in excellent condition) and lens cap

Tamron Adaptall SP 500mm f8 (Model 55BB) for Pentax K p&s with its built-in lightmeterThe Tamron Adaptall SP 500mm f8 is a compact telephoto mirror lens that packs a fair bit of magnification into a package less than 10cm long. To be fair, it's also about 9cm wide, but that's still pretty packable for a 500mm lens. Downsides to this type of lens is that it's manual focus only, somewhat dim at f8, you can't change the aperture at all, and out of focus highlights look like little donuts. But if you need a lot of magnification every once