Kenko extension tube OR raynox 250


KitKatKiat

New Member
Jan 9, 2012
43
0
0
23
Singapore, Punggol
twitter.com
#1
If given a choice, which one would you prefer for a newbie who is experimenting with Macro photography? The Kenko extension tubes or Raynox DCR 250, and why?
 

GRbenji

New Member
May 24, 2010
1,057
1
0
#3
Both have pro and con.

Ext tubes give high magnification for shorter lens while diopter (raynox) more effective on longer lens.

Diopter adds on the front of lens, so can be remove easily if necessary. Tubes have to remove lens to remove tube.

Tubes no glass involve so do not affect IQ but it causes light loss. Diopter is the opposite.
 

GRbenji

New Member
May 24, 2010
1,057
1
0
#4
Cowseye said:
Based on what I had been through. I would say not to use either and buy a cheap, old model, manual focus, Tamron 90mm F/2.8
One can still use tubes or diopter on macro lens to achieve greater than 1:1 magnification. :)
 

Last edited:

KitKatKiat

New Member
Jan 9, 2012
43
0
0
23
Singapore, Punggol
twitter.com
#5
Based on what I had been through. I would say not to use either and buy a cheap, old model, manual focus, Tamron 90mm F/2.8
Hmmm ..... How much is the tamron lens? And is there any website where I can see the shots taken with the lens? thanks!!

Both have pro and con.

Ext tubes give high magnification for shorter lens while diopter (raynox) more effective on longer lens.

Diopter adds on the front of lens, so can be remove easily if necessary. Tubes have to remove lens to remove tube.

Tubes no glass involve so do not affect IQ but it causes light loss. Diopter is the opposite.
This is really helpful. Thanks dude!

Anyway, shorter lens = 50mm and longer lens = 18-200? And a external flash is highly reccomended if I use either one, right?
 

Last edited:

GRbenji

New Member
May 24, 2010
1,057
1
0
#6
This is really helpful. Thanks dude!

Anyway, shorter lens = 50mm and longer lens = 18-200? And a external flash is highly reccomended if I use either one, right?
Every lens has certain magnification. Ext tubes and diopter will give additional magnication and the calculations are as follow:

Tube magnification = (Ext tube length)/(Focal Length)


Diopter magnification = (Focal Length x Diopter power)/1000
Raynoc 250 is a +8 diopter.
 

Last edited:

slmka

Senior Member
Dec 5, 2004
595
0
16
#7
Thx for the info, am I correct with the following?

Tube: 12mm = 12mm/100 = 0.12 = max 1.12 magnification

Dipoter (e.g. Raynoc 250) = (100 x 8)/1000 = 0.8 = max 1.8 magnification

Every lens has certain magnification. Ext tubes and diopter will give additional magnication and the calculations are as follow:

Tube magnification = (Ext tube length)/(Focal Length)


Diopter magnification = (Focal Length x Diopter power)/1000
Raynoc 250 is a +8 diopter.
 

GRbenji

New Member
May 24, 2010
1,057
1
0
#8
Thx for the info, am I correct with the following?

Tube: 12mm = 12mm/100 = 0.12 = max 1.12 magnification

Dipoter (e.g. Raynoc 250) = (100 x 8)/1000 = 0.8 = max 1.8 magnification
That's correct if your 100mm is a macro lens giving you 1:1 magnification.
 

slmka

Senior Member
Dec 5, 2004
595
0
16
#10
That's correct if your 100mm is a macro lens giving you 1:1 magnification.
Thx GRbenji for the info. Have been trying to understand the usage of these 2 accessories.
 

Top Bottom