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280mm f/4 Apo loose front element?


Csacwp

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I just got a 280mm apo f/4. There were some smudges on the front element, so I used a lens pen to clean them off. When doing that, the front element made some cracking/popping sounds that implied it wasn’t fitted tightly. It also felt loose even though I didn’t see it wiggle. Is this normal for this lens? Is the front element a protective filter of some kind?

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Yes the first flat glass is for protection the second one.

From Wiki, we see that quite well ;)

 

500px-R-telyt280f4.jpg

 

just an idea:

 

looking on mine, a small screw head on front, maybe it's there for unscrewing the first element.

I have not try to unscrew it yet.

Edited by a.noctilux
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