Kenko 2X Teleconverter or Extenstion Tube?

stanycjw · 26th February 2009

I am wondering what is the end result between the :-
a) Kenko 2X Teleconverter vs
b) Kenko Extension Tube.

I am confused, please help. To my understanding a Teleconverter is to double up the focal length says: 100mm shall becomes 200mm but with loss of 2 stops of light.

The Kenko Extender Tube (Hollow) is to add below lens and body (same as above) to bring the subject nearer to you specially for macro shooting. It will loss of 2 stops of light too.

I have below pic to show the setup. Standard distance of 1 foot and shoot subject with & without Teleconverter. I can see that the subject is closer at almost double when I added the Teleconverter 2X.

What about using Extension Tube? Any one have it so care to share this confusing matter for Newbies?

#1 Setup at 1 foot distance between subject to Lens

#2 Shoot subject with only 100mm Lens.

#3 Shoot subject with Kenko 2X Teleconverter added btn Body & lens

An drew · 28th February 2009

http://en.wikipedia.org/wiki/Extension_tube

With a teleconverter you minimum focusing distance is still the same, just that the image is enlarged.

An extension tube allows you to get closer and nearer than the lens' minimum focussing distance thus giving you greater magnification. The effect with each lens would be different though but you can search the net for the different results.

loboclerk · 28th February 2009

The more obvious difference would be the distance to subject.

With tubes u get a larger image of your subject on your sensor by being able to focus nearer. You can no longer focus to infinity as well I think.

With teleconv u get a larger image of your subject at the same focusing distance, means u need to be more stable or use higher shutter. But quality of the teleconv becomes important as you're adding another piece of glass in between.

Technically, with tubes there is no extra glass in between so nobody's going to complain about loss in IQ. Think teleconv works well if you're shooting skittish bugs like butterflies, and tubes for tiny ones like spiders.

26th February 2009	#1
stanycjw Member Join Date: Dec 2008 Location: Under yr bed Posts: 369	Kenko 2X Teleconverter or Extenstion Tube? I am wondering what is the end result between the :- a) Kenko 2X Teleconverter vs b) Kenko Extension Tube. I am confused, please help. To my understanding a Teleconverter is to double up the focal length says: 100mm shall becomes 200mm but with loss of 2 stops of light. The Kenko Extender Tube (Hollow) is to add below lens and body (same as above) to bring the subject nearer to you specially for macro shooting. It will loss of 2 stops of light too. I have below pic to show the setup. Standard distance of 1 foot and shoot subject with & without Teleconverter. I can see that the subject is closer at almost double when I added the Teleconverter 2X. What about using Extension Tube? Any one have it so care to share this confusing matter for Newbies? #1 Setup at 1 foot distance between subject to Lens #2 Shoot subject with only 100mm Lens. #3 Shoot subject with Kenko 2X Teleconverter added btn Body & lens __________________ Click Here to see my photos in Flickr;

28th February 2009	#2
An drew Member Join Date: May 2005 Posts: 1,145	Re: Kenko 2X Teleconverter or Extenstion Tube? http://en.wikipedia.org/wiki/Extension_tube With a teleconverter you minimum focusing distance is still the same, just that the image is enlarged. An extension tube allows you to get closer and nearer than the lens' minimum focussing distance thus giving you greater magnification. The effect with each lens would be different though but you can search the net for the different results.

28th February 2009	#3
loboclerk Member Join Date: Jul 2002 Posts: 593	Re: Kenko 2X Teleconverter or Extenstion Tube? The more obvious difference would be the distance to subject. With tubes u get a larger image of your subject on your sensor by being able to focus nearer. You can no longer focus to infinity as well I think. With teleconv u get a larger image of your subject at the same focusing distance, means u need to be more stable or use higher shutter. But quality of the teleconv becomes important as you're adding another piece of glass in between. Technically, with tubes there is no extra glass in between so nobody's going to complain about loss in IQ. Think teleconv works well if you're shooting skittish bugs like butterflies, and tubes for tiny ones like spiders. __________________ D80 / T180mm / N50mm / T11-18mm / S30mm / T17-50mm