[50D]

點解二手區呢支鏡咁平既...質數好差嗎？
有IS...有USM...
CANON $4900...街貸$4200左右....
二手區...都數BELOW $2000...仲有HOOD同FILTER跟...？

[jsklee]

check before buy then you will know the condition of the lens.

[50D]

咁支LENS本身質數...唔OK？

[jsklee]

quality? why not ask google?

http://www.google.com.hk/search?sourceid=navclient&ie=UTF-8&rlz=1T4WZPA_enHK311HK311&q=Canon+EF-S+17-85mm+IS+USM+review

[jsklee]

try to make friend with google, who can help you better than all ching

http://www.the-digital-picture.com/Reviews/Canon-EF-S-17-85mm-f-4-5.6-IS-USM-Lens-Review.aspx

[grandlun]

水貨都係呢個價ji ma

[50D]

下....水貨值2k only....canon標高個價做乜？

[Obi-Wan]

"質數好差嗎？" <=== not really that bad, at least better than 18-200 & 18-55 (non IS)
I have
(1) Sigma 18-50/f2.8 EX
(2) EFS 18-55
(3) EFS 18-55 IS
(4) EF 17-40
(5) EFS 17-85 IS
(6) EFS 18-200 IS

picture quality @ wide (17 or 18 mm) on 20D to 50D
(1) > (4) ~ (3) > (5) > (6) >> (2)

picture quality @ 50 or 55 mm
(1) > (3) ~ (5) > (6) > (2)

the most worst problem of (2), (3), (5) & (6) is CA at below 24mm (but can be corrected by software, e.g. CANON DPP)

* sigma lens has some back focus issue

the 17-85 lens is not that bad, just its quality does not fix the high price. I suppose the list price should be around $2500 for such a lens

[orabuln]

50d kit set 同齋body 價錢差三千二...
未出1855is 前個二手價都有二千六七嘅...