extension tubes.
- Thread starter bopins
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- Chris
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If they are automatic ones the camera will still control exposure.
I found that adding more than one made the distance to the image too small. I went with a macro lens eventually but tubes are a good way to start especially if you have high end glass.
I found that adding more than one made the distance to the image too small. I went with a macro lens eventually but tubes are a good way to start especially if you have high end glass.
I'm assuming that you know what the tubes do - decrease the minimum focus distance to (usually) allow for a larger maximum magnification..
Use them with a lens that has...
- a pretty short focal length, as 25mm tube on a 50mm lens will give an extra 0.5x mag but on a 100mm lens only 0.25x additional magnification.
- a good maximum magnification au natural, so you're not putting tubes on a 1:7 lens when you have a 1:4 in the bag.. you can find these in the lens specifications
- a reasonable minimum focus distance (MFD) at the maximum magnification, so your focus point doesn't move inside the front element of the lens
- a good manual focus ring because you will want to use it
Normally your best candidate for a random grab will be a 30-50mm prime lens or any Macro lens. There are many lenses that have 'Macro' in the name but are actually just close focusing so they are pretty good candidates.
So what tubes did you buy and what lenses do you have? Oh wait.. it's easier to just try them on every one and see what happens! :bonk:
ChrisH, where the focus distance ends up is completely dependent on the glass.. I regularly put 70mm of tubes (3 tubes + adapter) on my old manual focus FD 50/3.5 SSC Macro and use it on a modern camera..
Use them with a lens that has...
- a pretty short focal length, as 25mm tube on a 50mm lens will give an extra 0.5x mag but on a 100mm lens only 0.25x additional magnification.
- a good maximum magnification au natural, so you're not putting tubes on a 1:7 lens when you have a 1:4 in the bag.. you can find these in the lens specifications
- a reasonable minimum focus distance (MFD) at the maximum magnification, so your focus point doesn't move inside the front element of the lens
- a good manual focus ring because you will want to use it
Normally your best candidate for a random grab will be a 30-50mm prime lens or any Macro lens. There are many lenses that have 'Macro' in the name but are actually just close focusing so they are pretty good candidates.
So what tubes did you buy and what lenses do you have? Oh wait.. it's easier to just try them on every one and see what happens! :bonk:
ChrisH, where the focus distance ends up is completely dependent on the glass.. I regularly put 70mm of tubes (3 tubes + adapter) on my old manual focus FD 50/3.5 SSC Macro and use it on a modern camera..