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You lot are mad I say - mad!
anyway itznfb your test is slightly bias as you show it here - image resized for the net are very hard to tell apart image quality wise - heck a small point and shoot camera can give a largeformat Hassy a run for its money when images are scaled for the net. What you really need to look at are the pixel peeping scales - 50% to 100% (fullsize) crops of the shot - then you can see differences far more clearly.
As for filters - cheap glass is far more likley to be causing errant problems with your shots - causing softness, flare and aboration problems and sometimes more. Sure you can shoot through quite a bit of rubbish glass at times and still get a nice sharp shot (I have shot through enough zoo pens and windows to know this fact) but if given the choice I would rather not, and there is always the hightened chances of problems occuring (and they do) when one ends up in specific situations.
Highend filters I am sure will have little to no effect on sharpness, though in certain lighting conditions might still cause flare problems.
My own view is that if I use a filter I use a darn good one - and if I am in a dangerous environment for my lens, where material is likley to blow or come into contact with the front element (after bypassing my hood) then I will use a filter* otherwise my hood has protected my lens wel lthus far
*at least I would if I had one to use.....
Almost every pro I know shoots with a Quantaray filter. The ones that don't use Tiffen. Why? Because they're cheap.
Almost every pro I know shoots with a Quantaray filter. The ones that don't use Tiffen. Why? Because they're cheap.
I know a heck of a lot of pro's who don't use filters. But at the same time, they don't really care nearly as much about relative sharpness as amateurs do, so it seems paradoxical.