I'm in a really weird place as far as my gear goes, and I'm hoping someone can help me figure out the best route to go. I'm looking to fill in my <24mm focal length hole with a zoom.
I presently have a crop and full frame. I've never purchased an EF-S lens, as I've always intended to go strictly full frame one day. Now that I have a full frame, I'm not sure if I only want a FF at my disposal. I suspect my kit will continue to contain at least one crop.
Presently, my crop is for sporting events, or for anything else where I might want a cropped field of view. This excludes landscapes and portraiture, but I am dabbling in moon photography with my crop body.
I have a night photography workshop coming up, and I'm hoping to run both of my cameras during it. I'll be using my 24-70 on my 6D.
If I purchase a 17-40, that would be a 35mm FOV of ~27.2-64 on my 70D. I don't think that's low enough, so I don't think this lens is a contender. I could be wrong.
If I purchase a 16-35 ii, that would be a 35mm FOV of ~25.5-56. That's better, but still not thrilling. I think could live with that for the workshop, and I think this lens (being that as I understand things, it was designed for the 1.3 sensor), may actually perform really well on my 1.6 body. And, it will be usable on my 6D.
The EF-S 10-22 would give me a 35mm FOV of 16–35mm, which is perfect, IMO. But, this lens would only work on my 70D. My 6D would probably get the 17-40.
Depending on what the 7D replacement turns out to be like, I may purchase that and send my 70D off to be converted for astrophotography (once the warranty is up). If I don't think the 7D replacement is enough of an upgrade over the 70D, I may just purchase a 60Da. In the event I do wind up with a crop astro body, the EF-S 10-22 would certainly be useful for that. Otherwise, my eldest son (who is using my T1i) would really be the only person getting any use out of the 10-22.
The workshop is at the end of March, and I'm really confounded.
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