CONTAX CLUB Carl Zeiss 討論區

Although they can achieve similar function but the concept is different.

1. There is not glass element for entension tube which I believe having the min. effect to image quality.
2. Converter is actually increase the focal lenght with remaining unchange of existing min. focus distance. (ie. say 80mm f2.8 lens with 1m focusing distance. with 2x converter, that will become 160mm f5.6 lens with 1m focusing distance) I think the optical performance degration is "medium" but the trade off is the aperture will be one step down
3. The usage of Close up lens is adding a glass at the front element on the lens. I think this is the most conviencen method but the optical performance shall be the worst in this 3 option....

_________________
事務局長

Damn, my Calon Segur heart fall in love with Haut Brion

NO.

180mm/4 + 32mm + 56mm tubes can only reach a magnificant ratio
of 0.5!!!!

You can use the formula ratio=tube length/focal length as an estimator.

So, only planar 80 can reach 1.2:1 (96mm/80mm) with 56mm + 32mm + 8mm tubes (total: 96mm). However, it is very very convenient to do exposure compensation in this case, just +2ev!

In short, macro work is the Hercules's heel of old Hasselblad systems.

For your reference: the 180/4 image field range from 1'2'' ~ 6.7" (+0.6 ~ 1.1ev) with 32E; whereas 2'~9" (+0.4~0.8EV) with 16E.
Both are approariate for portrait work. Decision depends on how "big head" you want.

_________________
Would you choose the Rollei or the hassle?

OOOps!!

Forget to say that the longer the extension tube the more limiting is your working distance. For instance, after putting 16E on my 150/4,
I can only work from about 1.5m to about 1m roughly from my model.
If you use 32E, the working range will be shorter and closer to the model.

_________________
Would you choose the Rollei or the hassle?

上網搵左小小資料，得出以下結論，唔知岩唔岩，大家一齊研究下

1. extension tube
係利用電子去拉長 film 同 lens 中間個距離，使我地可以行近D 去影

2. converter
利用光學(即係 LENS ) ，拉長LENS 同景物，將景物縮細。

3. Proxars
利用光學(即係 LENS ) ，縮短LENS 同景物，將景物放大。

_________________
無晒D蝦, 得返T3, 進入泥坑

1. correct. delete "電子".

2. "拉長LENS 同景物" should be "增長鏡頭焦距"
(LENS 同景物距離不變的吧);
"將景物縮細" should be "將景物放大"

3. Proxars 即係放係鏡頭前面既放大鏡.

_________________
Would you choose the Rollei or the hassle?

超爆 thx
決定 buy tube!!

_________________
無晒D蝦, 得返T3, 進入泥坑

converter 同 proxar

邊個 QA 好D

_________________
無晒D蝦, 得返T3, 進入泥坑

Hasselblad 唔再出 Proxor 的了.... 原因係影出黎質素差左... 不過如果唔係 Serious photo 的話，我覺得用 proxor 方便好多

yea...also, the usage of proxar is limited marco...

_________________
事務局長

Damn, my Calon Segur heart fall in love with Haut Brion

唔知以下條link幫唔幫到手?

http://www.hasselblad.se/Archive/docume ... loseup.pdf

anyone need the extension tube manual (including chart of common combinations), just let me know.

我
plz email to lemon_gcc2004@msn.com

or 大家可以 add 我 MSN
lemon_gcc2004@msn.com

_________________
無晒D蝦, 得返T3, 進入泥坑

sent, please check your email

Dear kyle1127

Would you send me one copy of the tube manual? Thanks
rayip@yahoo.com

sent, please check your email