extension tubes


Status
Not open for further replies.

hopecount

New Member
Jun 16, 2008
73
0
0
28
Jurong
#1
hi guys
just got my sigma 70-300mm apo dg macro recently and have been using it for macro shots
however i cant get close enough for a fuller frame
i have heard that things such as extension tubes will help
if so, in what way and by how much
what kinds of extension tubes are there
and how much do they roughly cause

thanks!
oh btw canon user here
 

giantcanopy

Senior Member
Feb 11, 2007
6,232
2
0
SG
#2
They are a hollow tube ( yes just a tube ) with no optical elements within.

It moves the lens further away from the sensor / film.
The magnification depends on the length of the extension tube and the focal length of the lens. A shorter focal length lens will gain more magnification from a longer focal length lens with the same amount of extension.

You will however lose infinity focus of the original lens.
The working distance will be reduced as well.

Some tubes have electrical contacts allowing AF and metering to work. Kenko, Triplus are some makers ( they have canon mount as well )
They are usually not too pricey, and can get them used at cheaper rates ( since no optical elements, a used one will not
be too bad an idea )

Some however are fully manual.

Ryan
 

giantcanopy

Senior Member
Feb 11, 2007
6,232
2
0
SG
#3
Here is a set of three (Kenko) extension tubes.



and Triplus ( they are the same actually. . )



compare these hollow extension tubes to say .. a teleconverter. no glass, and much cheaper!



Ryan
 

BUZ_BUZ

New Member
Aug 25, 2006
215
0
0
#4
Teleplus ( aka Kenko ) has a set of 3 in 12mm, 20mm and 36mm,
with auto focus capabilities, available in both Canon and Nikon mount.

NOT cheap though, it cost about $190 per set. Bargain for this price, don't let the salesman take you for a ride.
( The Ah Lao salesman in Cathay Photo trying to sell me for $220 :thumbsd: )

There is another Teleplus single tube of 25mm AF capable ,cost about $95.
 

giantcanopy

Senior Member
Feb 11, 2007
6,232
2
0
SG
#5
NOT cheap though, it cost about $190 per set. Bargain for this price, don't let the salesman take you for a ride.
( The Ah Lao salesman in Cathay Photo trying to sell me for $220 :thumbsd: )
The Cathay fellas quote me 230 lor ...
The Camera Workshop gives u a better rate new and I got one of my sets there. The best rate u can get is our B&S.

There is another Teleplus single tube of 25mm AF capable ,cost about $95.
I got that for 30 bucks used :p

Ryan
 

alternatve

Senior Member
Dec 30, 2006
1,480
0
36
#7
Here is a set of three (Kenko) extension tubes.



and Triplus ( they are the same actually. . )



compare these hollow extension tubes to say .. a teleconverter. no glass, and much cheaper!



Ryan
Don't confuse extension tubes with teleconverters. They are two different types of equipment.

Samuel
 

giantcanopy

Senior Member
Feb 11, 2007
6,232
2
0
SG
#8
Don't confuse extension tubes with teleconverters. They are two different types of equipment.

Samuel
The teleconverter was shown to make sure there is no confusion between the two

Ryan
 

Status
Not open for further replies.
Top Bottom