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These are all great! How long is the tube?
I think I want a set of tubes and I need a decent flash I can use off-camera. Any suggestions for those?
I have the old Nikon K1 through K5 tube set - very cool for the wide angles, since the K1 is the shortest extension ring ever made by Nikon - great on my 20mm or 24mm. Found my set for $10 in the original leather case. Seen them as high as $150 on ebay, so shop carefully. Modern tubes are longer than the entire K1-5 set (40mm?), so for telephotos you may want to find something that is longer for closer focus.
Flash - if you don't care for TTL, anything will do as long as you can adjust the output. I use an a Nikon SB-16 from my F3HP and a Canon 540EZ I bought in the 90s, both with radio triggers from China (Yongnuo RF602, set of 3 receivers and sender for $65). TTL makes things much more complicated and very expensive, especially for remote trigger. Many ways to do this, sky is the limit.