Repairing hazy, cheap, 500mm F8 lens (Rexatar).

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Repairing hazy rear element of Rexatar 500mm F8 lens.
This is one of those cheap telephoto lenses you can get from multiply places. This copy is an older model and has a hazy rear element. It seems to be quite common with the older models. The brand is Rexatar, but is also branded and Vivitar, Opteka, Prinz, etc.
FR EP97
Music :
Confliction & Catharisis
&
In The Throes
By :
Asher Fulero

[@hieunghi1051]

How to open the front lens?