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Teleconverters and extension tubes etc.
Could someone please explain to me the difference between teleconverters, extension tubes, and any other magifying add-ons..

I heard people talk about using them, but just don't know the difference..

Thanks in advance..

Kajat..

Comments (5)

Kajat wrote:.

Could someone please explain to me the difference betweenteleconverters.

- That's a tube with lenses inside which you put between your lens and your camera. It makes the focal length longer by 1.4 or 2 times. Also reduces the amount of light (smaller aperture - darker), sometimes you can't use AF due to that, depending on your lens aperture. Reduces image quality too a bit. Is a cheaper alternative to longer telephoto. Samples:.

Http://lordofthelens.co.nz/JAlbum/Critters/slides/LIDSKI_CRITTERS%20(6).html.

Http://lordofthelens.co.nz/JAlbum/Critters/slides/LIDSKI_CRITTERS%20(52).html.

Http://lordofthelens.co.nz/JAlbum/Critters/slides/LIDSKI_CRITTERS%20(53).html.

Extension tubes.

- Same as above, but no glass inside - allows macro with a non-macro lens, samples:.

Http://lordofthelens.co.nz/JAlbum/Critters/slides/LIDSKI_CRITTERS%20(57).html.

Http://lordofthelens.co.nz/JAlbum/Critters/slides/LIDSKI_CRITTERS%20(51).html.

And any other magifying add-ons.

- There are also lenses you can put on top of your lens, like filters, for macro too, but those usually reduce image quality even more - I don't use them.Hope that helps?.

Http://lordofthelens.co.nz/..

Comment #1

I would just add that a teleconverter does not change the focus range of the lens, so it still focusses to infinity, and is not specifically intended for close-up work, though may be of benefit..

Extension tubes allow focus at very close distances, while at the same time removing the ability to focus at infinity. Because of the increased lens to sensor distance, the relative aperture is reduced, making the viewfinder image darker, and requiring increased exposure, though this should be handled by the camera's through-the-lens metering.Regards,Peter..

Comment #2

Sherwoodpete wrote:.

I would just add that a teleconverter does not change the focus rangeof the lens, so it still focusses to infinity, and is notspecifically intended for close-up work, though may be of benefit.Extension tubes allow focus at very close distances, while at thesame time removing the ability to focus at infinity. Because of theincreased lens to sensor distance, the relative aperture is reduced,making the viewfinder image darker, and requiring increased exposure,though this should be handled by the camera's through-the-lensmetering.Regards,Peter.

Quite so. I would like to add that some zoom lenses don't take kindly to extension tubes because they're meant to work at a specific distance to the sensor. You can lose a lot of sharpness with tubes and zooms. You're probably better off with an achromatic closeup lens. Most fixed-focal length ("prime") lenses behave very well with extension tubes, except for my 105 f/2.5 Nikkor, which is wonderfully sharp in normal use but completely useless for macro..

Leonard Migliore..

Comment #3

Michael,.

Any chance of telling us what set up you have for each of your linked shots? (incl. tubes etc.)..

Comment #4

Kajat wrote:.

Michael,.

Any chance of telling us what set up you have for each of your linkedshots? (incl. tubes etc.).

- Don't remember exactly, but I can tell you that I'm using Kenko Pro 2x TC with Canon 28-300 IS L (Canon white TC would be better, of course, but can't be used with this lens unfortunately) and a Kenko dedicated set of 3 ext. tubes (because they only have air, no glass inside, and Kenko air is not much different from Canon air). If I remember rightly, I actually may have used both the TC and ext.tude(s) for mating damesflies. I can explain my reasons, too. 300 + 2x = 600 mm. Of course, it's becoming difficult to use (dark, manual focusing, extremely shallow DOF, so the slightest movement of either me or the subject could take it out of focus) - but I can't justify buying a 600 mm Canon L.

Tube(s), the lens is so good optically that it equals a true macro in image quality; for moving subjects 28-300 + ext. tubes + maybe TC, because you have to be far away from them not to scare them..

Http://lordofthelens.co.nz/..

Comment #5

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