 Judy A. Lawhon |
Extenders Good evening. I have aquired a set of extenders to use on my 50mm macro lens. I'm not sure how to use them. There is a set of 3 rings with one having a silver end. How do I attach them and do I need to change exposure when using them. Thanks, everyone. Judy
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Justin G. |
Judy not to sound rude (just don't know how else to put it) there should only be one way to install them onto the camera. Just try them out and play until they get fitted on there. If you're shooting with a meter then yes you'll need to compensate for them (i'm not sure how unless they specifially state) but if you're shooting TTL then you won't need to change anything.
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robert G. Fately |
Hi, Judy - As Justin points out, the extenders should only fit on the camera in one direction - one side of each tube is like the camera mount and the other is like the lens flange. By moving the lens further away from the film/chip, you enable closer focus (and lose the ability to focus at infinity, which of course won't matter when you are doing macro work). The reason you have 3 different-length rings in the set is to allow you to mix and match them as you need - the more extension you use the closer you can focus, but a few MM can mean a lot of difference, so the idea is to give you some options. Again, to expand on Justin's comment, with the camera metering directly through the lens anyway (assuming that's what your camera does - most modern ones do) the meter will read the lesser light that gets to the image plane anyway, so it will automatically take into account any adjustments. If you use a hand meter, though, you will have to compensate - and how much depends on the length of the tube(s) that you insert behind the lens. Also know that when you use tubes (or a bellows - same thing) the depth of field becomes paper thin. SO if you lok through the lens and things are not focused, don't bother with the twist-ring on the lens itself - just move the entire camera back or forward until focus is achieved. It's because of the shallow DOF that macro rails are made, with rack-and-pinion knobs that can move the assembly very slightly back and forth.
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Judy A. Lawhon |
Thanks for your help, Justin and Bob!!
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