Has anyone ever paired these two pieces of gear with any success? Heading to India and need to travel light so I'm only taking 16-35mm and a 50mm. I'm afraid I won't have enough reach with just those 2 lenses hence the extender idea
Do you have the extender already?
I'm not sure how much they cost, but the 85/1.8 and 100/2.0 can't be much more, and they're pretty sweet lenses, better than a 50/1.4 and extender would be...
(fwiw, I just tried my Kenko 1.4x on my 50/1.8ii, it won't get to infinity wihout the glass touching. I'd suspect the same of your combo)
Or just carry around the 50mm. Not enough reach? Get closer. Not wide enough? Step back!
Though for travel, and if you want scenery/indoor then of course, carry the 16-35.
As for extenders, yeah- no, you'd be better off with cropping, that's right, you indefinitely lose quality
by using an extender, especially on a unsupported lens, and if you don't mind quality then
heck go get yourself a compact super zoom. And I also agree that either the 85 or 100 F2 are good alternatives.
It'll work.... but trust me, don't do it. You'll have cloudy, discolored photos that aren't worth a thing. Keep in mind, that you'll need to stop it down to a minimum of 4.0 to get anything resembling reality, more likely 5.6. I have the exact pairing and it's just not worth it.
I'd search Keh.com for an LN- or EX+ EF 100 f/2. Or a refurb on the Canon site. Really, why not get good glass instead of an extender for ~ the same $?
Extenders don't generally work well with retrofocus lenses. Thats why they specify using them with a lens of 100mm or longer. It might physically function with the 50, but you might not be happy with the results.