Well... technically my goal is a 95.5" lens but that doesn't sound as catchy.
After a lot of research and some very helpful answers on the forum I've concluded that's it's basically impossible to get hold of a lens longer than 70" / 1800mm, other than stumbling over one by chance in the wreckage of a crashed spyplane prototype or an abandoned nuclear testing bunker. My goal is a 2400mm lens with at least 24 degrees of coverage, I would appreciate a wide-ish aperture (f/16-22) but I'll settle for something narrower if need be.
My question then is this - if you needed a 2400mm lens, what would you do to go about building/finding/adapting one? Would you get the best results by finding an existing lens and adding a negative/tele group to the back of it? Would you crack open lenses already in your possession and swap elements over? would you try building something entirely from scratch?
I'm planning on trying all of the above, starting when my shipment of elements from SS finally turns up, but I'd be grateful of any pointers. I don't have an unlimited budget but I'm willing to spend time and money on this - I also have a range of wide-aperture lenses all the way up to 1200mm and I wouldn't hesitate to "borrow" bits of any of them to make this a reality if that's what it takes.
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