I currently have an old Popular Flash for my AE-1. I am curious if there is
anything avaible to replace this

If you want a handle-mount, you could use a Metz 45CL4 plus SCA 311 module.

If a shoe-mount will do, the Suinpak 433D/Canon is easy to use and easy on the
wallet.
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regards,
Henry Posner/B&H Photo-Video
http://www.bhphotovideo.com