How to use an old lens

From right to left

a) an old Tamron 70-210 lens from my old cameras with an Adaptall-2 mount
b) an Adaptall-2 to M42 screw mount adapter
c) a 2x teleconverter
d) an extension tube making it a 3x converter
e) an M42 to Canon EOS converter

Total makes it about a 210-630 mm lens

oh - and it's not a full frame camera so that is also increased due to that

What could possibly go wrong!!!

apart from being very cumbersome and needing quite a lot of light to operate

itching to try it out