Extension Tubes used with longer telephoto lenses?

4 months 2 weeks ago #661366 by Harper Coswell
I was watching some YouTube video's showing photographers photographing insects using extension tubes.  Are extension tubes just for macro lenses or can you use these with telephoto lenses also?  If the mount doesn't get in the way, it should work right?  


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4 months 2 weeks ago #661371 by Nikon Shooter
Yes, Harper, it will work.

The benefit of these tools is to increase the closest fo-
cusing distance relative to a given subject.

Sure, one would rather shoot a rattler from a distance I
presume. A longer lens will permit just that without any
other cost than reduced DoF and some ƒ stops but no
quality loss.

The better choice is a version with all interface contacts.

Light is free… capturing it is not!
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4 months 2 weeks ago #661376 by Harper Coswell
Thank you.  Just to clarify, you DON'T lose any stops when using one of these compared to using a teleconverter right?  


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4 months 2 weeks ago #661381 by Nikon Shooter
Both the TC and the ET will cost you ƒ stops. Like I said…

Nikon Shooter wrote: without any other cost than reduced DoF and some ƒ stops but no quality loss.


You're welcome! :P

Light is free… capturing it is not!
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4 months 2 weeks ago #661387 by Shadowfixer1

Harper Coswell wrote: Thank you.  Just to clarify, you DON'T lose any stops when using one of these compared to using a teleconverter right?  

Anytime you move the lens further away from the sensor you will lose stops. The only exception I know of is with a speed booster.

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4 months 2 weeks ago #661389 by Nikon Shooter

Shadowfixer1 wrote: Anytime you move the lens further away from the sensor you will lose stops.



Inverse square law oblige.

Light is free… capturing it is not!
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4 months 2 weeks ago #661399 by Ozzie_Traveller
G'day Harper

Good question by the way :)

a) yes- extension tubes can be used with just about every lens on the market
b) the 'golden rule' is "when the extension equals the focal length, your images size is 1:1"
c) as far as Aperture is concerned ... remember that your aperture always is a fraction of diameter of opening divided by millimetres of focal length. ie: F8 diameter equals 1/8 the mm's of the lens
d) if you add extension tubes, the usable focal length / distance is increased but the aperture has not altered, so 1/8 soon becomes 1/11 or even 1/16 the millimetres ... and so your aperture changed from F8 to F11 to F16 [sort of thing]

Hope this helps
Phil from the great land Downunder
www.flickr.com/photos/ozzie_traveller/sets/


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4 months 2 weeks ago #661437 by Don Granger
+1 Good post and answers


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4 months 2 weeks ago #661561 by fmw
No, moving the lens away from the camera involves a loss of light.  The benefit of the tube is that is provides closer focus at the expense of infinity focus.  The negative is that it reduces the ability of the lens to gather light.  A lens with tube isn't quite as good as a macro lens because macro lenses are designed to work better at close focus.  They provide better edge sharpness.  But it is an inexpensive way to get good results if used properly.


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