[hottalk]

想問下各位師兄marco extension tube同tele extender原理/應用上有咩分別?

兩者都係將影象放大, 佢地嘅效果有咩唔同呢? 對影象質數, 失光等等...

如果我買個tele extender, 用於50mm 1:1marco上鏡上, 會唔會對最近對無距離/放大倍率有影響呢?

Thanks!

[hottalk]

anyone can help?

[amadeus_hk]

one has lens inside (teleconverter)
= you still have to maintain the same distance (the original lens min. focal distance) between you and the item you want to shoot at.

one does not have lens inside (macro ring)
= then you move closer to the subject to take photos (shorter distance between you and the item you want to shoot at)

purpose: use when you think it is appropriate. Tele lens can take images like macro.. it is not to say that you have to use the macro lens to take marco like images. But...

- depth of field could be different.
- amount of light energy lose could be different.
- distance between you and the object could be different.

[whispermakers]

你係咪講緊一套3件果set marco extension tube?
if so, 如果你係用嚮50mm既鏡既話, 就算你用最短果個tube, 你可能會對唔到焦, 又或者可對焦範圍會好少--可能得2-3cm. 我自己都係用支tele鏡+tube咁玩.
效果我覺得可以接受, 因為果支唔係微鏡但出來既pq我覺得算係咁 (你可以睇下我d 蝶 相)
因為焦段愈短可對焦範圍會愈短, 另外同光圈大細都有關係, 亦都係愈大愈短, 點解會咁有ching講過但我唔記得左^^", ching亦都 post過條link有個換算表, 但我依家部機冇bookmark到, 你要可以pm我我sent比你.
至於tele ext. 我有用過, 要等其他ching答你lu ^^"

[hottalk]

Thanks 2 ching above!

[h0001244]

看這個你會知玩緊咩，不過舊左D，but same theory
http://www.bobatkins.com/photography/eosfaq/closeup.htm