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Even though Canon's EF 400mm f/5.6 USM is the cheapest super telephoto option out there for auto focus lenses, it's still a little too rich for my blood, especially if I can get a faster lens for less.

That's why I'm considering the Canon FD 400mm f/4.5 or the Tamron Adaptall SP 400mm f/4.0 LD-IF. For either I would have to buy an adapter of sorts, and for nearly the same price. And I know the FD-to-EF adapter would add some telephoto reach and slower light in order to maintain infinity focus. But, how does the tamron adapter work? Would it behave in a way that I maintain 400mm and f/4.0?

Although both of these lenses are known for sharp resolution, these are old and rare lenses ... but I hope a few of y'all have some valuable feedback.

Personally, I'm leaning towards the Tamron. Anyone suggests differently?

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MrKman | website
Canon EOS 5D II + PowerShot G12
Samyang 14 f/2.8 + Tamron 28-75 f/2.8 + Samyang 35 f/1.4 + Sigma 70-200 f/2.8
Yungnuo YN560 + YN560ii (x2) + Cactus V4

WISHLIST: 300 f/2.8
FORMER: Canon 5D + 40D + 450D + 18-55mm + 28-135mm + 50 f/1.4 + 100 f/2.0

Hi MrKman,

Canon produced some quality FD to EF adaptors (which have to contain glass to allow FD lenses to reach infinity focus on EOS bodies) when the EF system was first introduced but since then there have been a lot of adaptors which either don't contain glass or, if what I read is true, contain inferior optics which rather defeat the objective (sic ). Out of interest which FD to EF adaptor are you considering? Will it also offer focus confirmation?

Bob.

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OM-D E-M5 + ED 12-50mm, H-PS14042E, H-F007014E, L-RS014150E, M.ZUIKO DIGITAL 45mm 1:1.8.
Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.

Oh just a well-reviewed one on Amazon--a $30-50 one. What you bring up is another reason why I favor the Tamron options: it's faster and I wouldn't be adding more optics between subject and sensor. Seems like the Tamron adapter is less expensive too.

_________________
MrKman | website
Canon EOS 5D II + PowerShot G12
Samyang 14 f/2.8 + Tamron 28-75 f/2.8 + Samyang 35 f/1.4 + Sigma 70-200 f/2.8
Yungnuo YN560 + YN560ii (x2) + Cactus V4

WISHLIST: 300 f/2.8
FORMER: Canon 5D + 40D + 450D + 18-55mm + 28-135mm + 50 f/1.4 + 100 f/2.0