For about the same price..RF 70-200mm F/4 or EF 70-200mm 2.8 IS iii ?

Started 8 months ago | Questions thread
drsnoopy Regular Member • Posts: 438
Re: For Example

I love this:

But it doesn’t have any bearing on weather sealing.  The only way that fly got in was when the rear lens cap was left off, and that can happen to any lens.  As to effect on image quality, I once had a cracked front element on my 50mm f1.4 Rokkor while on holiday, back in film days. I painted the crack with a thin line of black paint and carried on using the lens, but no smaller an aperture than f5.6.  No effect visible on my slides. So a fly is nothing, let alone a little dust.  I’ve used my sliding, dust-sucking 24/105, 100-400 EF lenses in the rain, and never found any moisture.  Also on Safari and no dust. But I’m careful not to leave the rear cap off…

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