Need assistance to identify a Sigma Lens.

[ameerat42]

On the question of whether it has/has not got a filter, do this simple inspection:

Look at the front of the lens. The first actual lens element is the smaller glass about
half the diameter of the lens body. IF IT has got a larger flat glass surface at the very
front of the whole lens element then it is (most likely) a filter.

If it is a clear filter then AND you cannot easily remove it, then don't worry too much
about it, as it will probably have negligible effect on the IQ (Image Quality) that the
system is capable of.

Have a look at this page of images. The word "Macro" that appears "near the front" of
the lens body is actually engraved on the lens and refers to that much touted function
that it is supposed to sport.

As said above, it seems to be a capable enough lens. When you feel that its usage has
some limitations to your photographic needs then it will be time to look for some other
lenses as complements to this one.

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PS: If you feel an overwhelming urge to go ahead and remove any such filter that may be
attached the lens, then perhaps take it to a "good old local" camera store, where they will
doubtless do it for nothing. - But beware of their suggesting you buy something you most
probably will not need