I want to buy a clear filter for my Sony FE 24–240 mm F3.5-6.3 OSS lens and my choice is B+W 72MM XS-PRO CLEAR filter.
But I am confused between slim/wide angle and standard ones. Which will be the best for the lens?
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Slim filters have thinner rims which are intended to cause less potential vignetting issues with, in particular, wide angle lenses.
I am personally of the opinion that no clear filter is the correct choice for normal shooting, unless you are shooting in dirty settings ( mud, sandy beach perhaps, near sea spray ). In the absence of these conditions all you're doing is introducing a layer of glass that the lens was not designed for.
Some people consider these protection devices. I don't find them useful myself in that way.
Which type (slim or normal) is best for your lens is a matter I can't be very specific on. Your lens is not unusually wide, (24mm), but is a little wide than a standard zoom (which would be 28mm typically at the wide end). If, however, you intend to use the lens with the filter on all the time then I'd recommend the slim type as you should minimize the potential for vignetting unless you can test the issue before buying.