http://www.dyxum.com/dforum/sal55300_topic89929_page3.html這有人拿SAL55300,Minolta 10-300 APO D , Tamron 70-300 USD結論 :SAL55300 Compared to the Minolta 100-300 APO DFocus speed and Accuracy is comparable 對焦速度差不多Quieter, but not nearly as quiet as SAM II or SSM or USD from Tamron比較安靜,輸給 SAL18135SAMII, SSM ,Tamrom (廢話USD 基本就是SSM or USM )A little softer at f/5.6, slightly sharper at f/8 at 300mm3000mm f5.6比APO 軟,F/8比APO利A little larger in overall size - comparable weight尺寸差不多SAL55300 Compared to the Tamron 70-300 USDSmaller and lighter 比較短和輕NoisierSlower focusing (unsure if the Sony is good for fast action sports)對焦比較慢而且吵 (廢話tamron USD)Sharper at 300mm300mm比較利,tamron 不是有紫邊的問題嗎 ?-----------------------------------------------------作者結論 : 最銳利:SAL55300, 對焦最快: Tamron 70300 ,最小顆: minolta APO連結照片:看完後 我去買了一支SAL55300, 還沒時間拍,不過focus speed 輸給我的SEL55210SONY 很聰明 ,SAL55300會不會打到烏骨G,不會 ,因為烏骨G是全幅鏡,而且是SSM成像呢?以個人記憶 SAL55300 = 90% SAL70300G , 主要輸在邊緣畫質有差
A57+300mm端ISO400, F5.6 1/60ISO400, F5.6 1/80不知道是A57中心點AF不夠準還是因為下雨天還是手晃到還是因為中央對到白色毛而不準, 銳度只能到這樣明顯輸給下面這張5N MF +SEL55210 210 端ISO400 F6.3 1/60這張明顯比較利(同地點,同一隻鳥)改天晴天再測用MF請問有A57的先進,它的三個十字的精度如何?