Tubes
May 11, 2013 19:53:44 #
I bought two canon extensions, 12 &25 to use with my 100mm macro lens The instructions say not to use more than one tube at a time ? I understood they are made to be stacked to get closer to your subject. Right or wrong
May 11, 2013 19:54:36 #
Extension tubes are quite often stacked, which does allow your lens to get closer to subject. With "Auto" extension tubes, you can focus wide open, and the camera will close-down aperture for proper exposure. With "simple" extension tubes, there is no communication between camera and lens, so you must close-down after manual focus, but before photograph, or manually focus through a closed-down lens (more difficult with stacked tubes).
Do you have simple or auto-extension tubes?
Do you have simple or auto-extension tubes?
May 11, 2013 20:13:12 #
Nikonian72 wrote:
Extension tubes are quite often stacked, which doe... (show quote)
Thanks for your response
They are auto
May 11, 2013 20:16:11 #
May 11, 2013 20:20:35 #
Richard K wrote:
With both on my 100mm lens what would that give me1-?
Best test is to photograph a metal mm rule with the tubes and the lens at 1:1. 24mm should be the measure at 1:1; from there it's math
May 11, 2013 20:21:45 #
Richard K wrote:
You need to measure for yourself, using this metric ruler technique.With both on my 100mm lens what would that give me1-?
FAQ: How to Document Field-of-View of a Macro Lens
http://www.uglyhedgehog.com/t-36370-1.html
May 11, 2013 20:27:56 #
LoneRangeFinder wrote:
Thanks for the infoBest test is to photograph a metal mm rule with the tubes and the lens at 1:1. 24mm should be the measure at 1:1; from there it's math
May 11, 2013 20:28:43 #
Nikonian72 wrote:
Thanks Douglass. I will give it a shot.You need to measure for yourself, using this metric ruler technique.
FAQ: How to Document Field-of-View of a Macro Lens
http://www.uglyhedgehog.com/t-36370-1.html
FAQ: How to Document Field-of-View of a Macro Lens
http://www.uglyhedgehog.com/t-36370-1.html
May 11, 2013 20:34:35 #
Here are the dimensions of your sensor (22.2-mm wide), to compare with your captured Field of View.
May 12, 2013 07:45:58 #
Sounds like you bought the canon extension tubes. I was just given the 12mm and put it with the Vivitar extension tubes (also auto) and it works fine.
May 12, 2013 08:00:36 #
Oh, I screwed up with the "24-mm". Not paying attention. Your Canon should be closer to 22mm across.
My bad.
My bad.
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