[jimmie lam]

我現在用 canon 60d+龍仔 70-300mm f/4-5.6 想加個增距鏡,有咩建議???

[royfch]

龍仔 70-300mm f/4-5.6 加吾到增距鏡，夾硬加上去自動對焦都可能會失效。

[jimmie lam]

royfch ching, 咁姐係如果用手動對焦會有機會用???

[look_yau]

Kenko

[rankinelo]

jimmie lam Ching,

夾硬加上去, PQ都會唔好啦, 肯手動都未必ok

[jimmie lam]

rankinelo ching,咁如果好像 look_yau ching 提出"Kenko"這個可以嗎?

[donthinkcapture]

想問下各位CHING, 我有支CANON 135MM F2, 想買Kenko MC7 AF 2.0X , 適合嗎? 如果得的話出面大約賣幾錢到? THANKS.

[billshm]

你用60D應該加增距鏡是沒左自動對焦, 如果貼膠紙應該OK, 不過效果出來應該得返DC的質數

[dcfandy]

ching 是可用Kenko增距鏡加 手動對焦會用倒,但加左光圈去到 f8 and 打後只有手動對焦啦. PQ得返DC的質數啦! 希望資料可幫助倒你 .

[jimmie lam]

thx 咁多位ching的解釋,照睇這個"Kenko增距鏡"作用不大.

[wiltse95]

我用"死馬" x 2, 質素應該比kenko高, 手動對焦用慣了就沒問題.
因焦距長, f8細光圈也可以做到淺景深.
以下照片是用"死馬"x2拍的, 可以參考一下:
http://www.dcfever.com/photosharing/enlarge.php?id=1165247
手動對焦打蜂沒難度: http://www.dcfever.com/photosharing/enlarge.php?id=1152161
http://www.dcfever.com/photosharing/enlarge.php?id=1165834

[wiltse95]

我不認同用了x2 PQ剩下DC的質素, 再來一張 "死馬"x2, 手動對焦打飛行中的蜂: http://www.dcfever.com/photosharing/enlarge.php?id=1151153

[jimmie lam]

都 ok 喎,
wiltse95 ching 唔好意思,唔知 "死馬"x2 係點樣,大約幾 $$

[yinGw]

想借問一下, 加了AF增距鏡後仲有冇得相機上收光圈? 定係要有光圈環的鏡頭先可以收光圈?

[h0001244]

Few years ago I bought a Kenko 2X, few things to note here
-Kenko is fit for all EF lens no matter a tele lens, wide lens, zoom lens, canon sigma or tamron. Therefore only canon EF-s cannot be used. I am not sure if the latest one can also use EF-s, pls check yourself
-For lens with 10 contact points (look at the lens mount on your lens), say 100-400L, 70-200L etc, the 2X will reduce the aperture value by 2 stops and double focal length. Aperture value will be shown on camera and both aperture and focal length will be shown on exif.
- For lens with 7 contact points, say 24L, S28-300, T18-200 etc, the aperture value will not be reduced on camera, however, you will notice the brightness is dimmed. Obvious, this is Physics. The focal length will not be doubled on exif.
-You can now notice that only the 3 additional points affect the reading of aperture and focal length. The reason why some people use a tape to cover the 3 points is that they want the reading of aperture seen by the camera retain in maximum in order to maintain the auto focus function. Say a 300 F4 L with 2X on 5D => 600 F8 will not have auto focus, with the tape, the camera will see a 300 F4 L only, therefore it maintains auto focus but physically it is a 600 F8
-I tried a T18-200 F3.5~F6.3 on 2X on 20D under bright sunlight noon in summer. This lens has 7 points only, there the camera reads 18-200, but physically it is now a 56-400mm F7.1~13. The auto focus activated by pressing the shutter button halfway, however I can never make a correct auto focus. This might be due to reduced aperture that dimmed the light and hence weaken the auto focus function and mismatch of the system.

hope the above helps