Canon EF 50mm 2 (plastic fantastic)

2 years 4 weeks ago #736490 by jockodiounto
Hello all,

I am new to photography have an interest in astrophotography. I have recently made my first new but budget purchase on the above lens which is great compared to the kit lens I got with my Canon EOS 600D.
However, during long sessions, it would appear that the lens tends to lose focus while in MF mode presumably as the build is quite flimsy. 
Is this an acknowledged behaviour of this nifty fifty and if so is there anyway to correct?
I generally am taking 5second exposures around 50 at a time before re-centering target (and also re-focusing)
Any help and advise is greatly received.
Cheers
Mark


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