How do you use non AF extension tubes?
- Thread starter Robbo
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OP
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lol should explain a bit more,,,,
just messing about and took the lens off and in take the f. down to 00.....using non AF tubes will this always leave the f. at 00? hence people say about the shallow DOF?
PauloWanClift
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You need a lens that lets you set the aperture on a ring on the lens?
OP
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ahhh ok.....so if i dont then im screwed at its always going to be f.00 using the extensino tubes?
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- Mike
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Assuming you are using Canon, with the lens on the body with no tubes, set the aperture you want. Press and hold the DOF preview button and remove the lens from the body. Now attach the tubes and the lens will at the selected aperture, although it will still show f00. The viewfinder will also be quite dark if you select a small aperture.
OP
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they will be going onto a canon 60mm macro lens.
do you need to keep the DOF held throughout ?
I may just invest in the kenko set as this sounds like an easier option lol
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That is the best plan ....... manual tubes are a such a pain to use you just wont bother.
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Only hold the DOF pressed as you remove the lens from the body. The idea is that the lens stops down to the selected aperture when you press the DOF button, then gets "stuck" there when you remove the lens from the body.
Kenko tubes have electrical contacts between body and lens so AF and aperture work.
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- Derek
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Your camera is reading f00 because with no lens fitted, there is no information being supplied to the camera as to what apertures are available from the lens. With manual extension tubes, which have no electrical connection, the same situation exists.
With no electrical connection, the camera cannot 'tell' the lens what aperture to select when taking the shot. If your lens has a manual aperture ring, it can still be used with a manual extension tube, you just need to set the aperture on the lens yourself, rather than relying on the camera to do it.
With no electrical connection, the camera cannot 'tell' the lens what aperture to select when taking the shot. If your lens has a manual aperture ring, it can still be used with a manual extension tube, you just need to set the aperture on the lens yourself, rather than relying on the camera to do it.
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I don't think any Canon fit lens has a manual aperture ring.
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just a bit more than 2:1 with a full set.
OP
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That sounds exactly what am after!
Also if I has. 1:2 ratio at 300mm on my other lens do you know what that would go to roughly?
Thanks
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Not much more, probably about 1:1.8. The longer the focal length, the less the tubes' effect.
before you spend any amount of money ... look at this ..
http://www.flickr.com/photos/handmade-uk/4093103309/
cheap adapters and cheap M42 tubes and lens
EDIT > oh , and it's a zip on a CD wallet ! nothing else ... LOL
http://www.flickr.com/photos/handmade-uk/4093103309/
cheap adapters and cheap M42 tubes and lens
EDIT > oh , and it's a zip on a CD wallet ! nothing else ... LOL
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Check which Kenko tubes you get, most of them do not accept EF-S lenses, only EF as the interior baffle is fractionally too big. I believe some Kenkos do EF-S though, just be careful you get the right ones.