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Terri Stevens wrote:
you need to take the lens cap off before taking a picture
Lens caps? I hate fiddling with that. I put a glass filter on and let that take the beating.
Which reminds me. You've all seen the tourists with huge 70-200 zooms dangling on their bellies? And how they all have the lens hood permanently attached, in the reversed (flipped back) position where it serves absolutely zero purpose? Do they ever wonder what it's for...? 
https://forums.adobe.com/people/D+Fosse wrote
Terri Stevens wrote:
you need to take the lens cap off before taking a picture
Lens caps? I hate fiddling with that. I put a glass filter on and let that take the beating.
Which reminds me. You've all seen the tourists with huge 70-200 zooms dangling on their bellies? And how they all have the lens hood permanently attached, in the reversed (flipped back) position where it serves absolutely zero purpose? Do they ever wonder what it's for...?
I found this old thread while looking for PSD vs TIFF threads.
A few days ago a local PJ buddy bought his (the paper's) camera round for me to clean the sensor. My tool kit contains an Arctic Butterfly static brush, Pec Pads and Elipse Fluid (two types), and my magic weapon which is 7X illuminated loupe. It got to where I couldn't anything on the sensor, but he was still some significant spots at F22, so I asked if I could have a look, and found that the lens protecting filter had potatoes growing on it — or could have done. I used a discarded Pec Pad and Elipse fluid to clean the filter, and all was well. The lens was a Canon 24-70mm F2.8L (the original version).
Many years ago I had a Canon 24-105mm F4.0 which had a tiny scratch on the front element. You couldn't see it even at F22, but I always thought it an unsatisfying lens to use. Especially into the light where it had a tendency to flare, but I never really liked that lens, even before it got the scratch.
The lens rental guys did a tongue in cheek test some years ago, stacking up a crazy number of front filters,
Exaggeration is a good way to make a point, and the point is clear judging by the with and without 50 filters images.
A wider view shows there is also a halo effect.
So if you are going to use a filter on your top quality lens, use a good one, and keep it clean. I personally don't use filters for lens protection, but _always_ have the lens hood fitted when the lens cap is off.
Note: Arctic Butterfly static brushes are great, but ridiculously over priced. I paid NZ$200 for mine, but I suspect this $30 item on Amazon would do exactly the same job. I managed to drag grease from the mirror hinge, across the sensor on my one week old $13,000 1DsMK3 about ten years old, so keep them away from mirror hinges.
My loupe was also a Visible Dust (who make the Arctic Butterfly) item, and similarly overpriced at around the US$100 mark, but here again, I suspect that this $20 item from AliExpress would do the job.
There used to be two versions of Eclipse fluid, but the E2 is now discontinued, which I guess means that the original version was always OK for all sensor types. The E2 apparently takes too long to evaporate, but I usually use a second, dry, Pec Pad to polish after a wet clean of the sensor. I think I have three bottles of the stuff due to a repeat order. Never mind. The local photographers come to me for sensor cleans, and I get the occasional bottle of wine out of it.
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