1) Is 550 a fair price for this lens USED?
Yes - most previously-loved fisheyes are way north of $600.
2) I know that this lens cant take filter, for the experienced users out there,
has this been a problem?
You have to use more care and attention, because the very small butterfly
hood design gives almost no protection for the convex element. It is more
open to scratching/damage, whatever, than "normal" lens glass, but no, this
is not a deal-breaker, and has never been a problem. The supplied cover is
more substrantial than usual Nikon aps, and slips over the sides of the lens
front, rather than just snapping into place across the glass.
3) is fish eye lens much wider than UWA?
It is a tad wider than some UWAs, but offers a different perspective,
with curved straight lines. It plays with your mind a lot It curves lines
which would be straight when using a rectilinear WA ( 10-20 / 12-24 )
4) I did have 10-20 sigma but i sold because it was soft wide open at f4
and I found that wide angle was pretty tricky to use. do you think that
10.5 fisheye will be better in terms of sharpness performance? and is it
hard to use fish eye lens?
The 10.5 has astonishing sharpness, even at f/2.8 and is easy to use
when yoiu have adjusted to the lens quirkiness.
5) it wont AF with my body, so i have to MF, is it difficult?
Dunno - always use AF with this lens
6) should I just get UWA lens instead of fish eye? i am thinking that fish eye
lens is unique and maybe fun. am i wrong to think this way? i understand
that the fish eye lens is not really that popular.
The fisheye teaches you to look at photography in a different way. If you
keep the horizontal line even, it is a very WA lens. A normal WA is probably
probably be more useful and versatile, but not as interesting or unique.
You can do things with the fisheye which you can't do with any other lens.
If that is what you seek, then go for it, you won't be disappointed !
I find it fuels my creativity, such as it is
7) for fish eye lens users out there, what do you use this lens for? landscape
or what?
seascapes, landscapes, cityscapes, interior and exterior of buildings, unique
sem-macro, architecture shots, nighttime starry sky, church interiors and
exteriors.
Couple of other thoughts :
If you do not do a lot of photography, this lens might be too much of an
extra. In other words, you have lenses which you might already use for
those occasions, and so would not use the fisheye much. Another way of
saying it is that this is a very specialised lens. It is a wonderful high-quality
piece of equipment IF you need it
Not a people lens, becauser of the close-range distortion - big noses, etc.
It can be useful for groups, if you keep it straight, and subjects towards
the middle
It is wonderfully compact, so can slip into a camera bag without fuss.
I tend to carry it "just in case" because of its small size and weight.
It can teach you a lot about varying light conditions because, while
( say ) 35mm will show a certain width of scene, where the light might
be consistent across the frame, the fisheye will display a wider scene,
where light will almost certainly be at differing levels.
this sunrise shot of no particular merit shows that you can't isolate or
highlight anything unless it is really close. In this one, I elected to keep
the horizon straight, so the shoreline became curvy
. . .