Tamron Adaptall SP 500mm f8 (Model 55BB) for Pentax K p&s this adapter provides a 180-degree

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

with its built-in lightmeter

very slight warming tone

) Quite handy

Tamron Adaptall SP 500mm f8 (Model 55BB) for Pentax K p&s this adapter provides a 180-degreeThe 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