Quote:
Originally Posted by raymo
I'd get the Skywatcher Esprit 80 ED. Same focal length 400mm f/5 as the lens, but slightly faster, and much more versatile,[ who knows, you could even look through it sometime]. and more light grasp than the WO 71.
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Unfortunately, the Esprit 80 only has a 33mm flat imaging circle, which is fine for APS-C but less great for the bigger sensor in the 6D. That's one of the reasons I ended up "upgrading" to the Esprit 100, as the imaging circle is 40mm, almost enough for a full frame with a tiny bit of cropping, but the focal length is a little longer at 550mm.
The Star71 seems to be pretty unusual in that it's supposed to be flat across a whole full frame sensor and be short focal length.
Nothing stopping you using it for daytime of course, although I'd expect it's a little heavier than the Canon lens
