Paul,
I can help, but is it too late now? I can lend you a 100mm f4, a 55mm f2, a 50mm f1.4, a 35mm f3.5, or a 28mm f2.8. The first 4 are original Takumar lenses, and the 28mm is a Chinonflex, but still an M42 thread. I wouldn't say they are in pristine order, but I have taken quite a number of shots with them with quite acceptable results. Borrow one, two, or all of them, as you wish. If you need, I also have an Pentax lens-EOS body adapter. If you want, I can post/you can collect/courier, whatever you want, and you can return it/them at Astrofest. I have no immediate need of them. I have PM'd you with a telephone number if you want to contact me.
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