[doraemon32]

想入支反射鏡映花好耐，昨天在二手店試咗支Sigma 600mm EOS mount，成像幾好，但沒有hood 同filters，因找不到此鏡資料，請教各方能人相助提供，謝謝！

[Obi-Wan]

I have this lens, over 20 years ago. How much in 2nd hand shop.

The lens is extremely difficult to focus in APS-C camera, better on 5D or 1DS series.

The optical quality is so-so

One thing for sure is that this lens is extremely difficult to avoid vibration (960 mm equivalent in APS-C canon) ---- I ever got any sharp photo with this lens (except when using flash), probably do to handshake. Those photos taken for long distance objects are seriously affected by the air pollution problem, air current & camera shaking.
e.g.
http://www.dcfever.com/media/sharing/07/12/13/l1577661197476194_l.jpg
http://www.dcfever.com/media/sharing/07/12/13/l1577661197476117_l.jpg

The last time I shoot this lens with 3 sand bags loaded on top of this lens mount on a very very steady tripod to avoid vibrations. But the mirror vibration cannot be eliminated unless u use mirror lock up.

[doraemon32]

店主開價2500，我仲未還價。剛好朋友帶了部D60，ISO1000，中午拍尖咀街頭，快門約1/250，手持未按快門時震得利害，拍出來還可以。店內另有一支55B，開價3000過外，故暫不考慮。

多謝你的意見，還請問有何好介紹？Tokina 500如何？還是找支55BB？

[Obi-Wan]

if $2000, I guess it's acceptable