Extension Tube Fail
Dec 26, 2017 14:44:38 #
gvarner
Loc: Central Oregon Coast
twowindsbear wrote:
Why are you telling me this? I'm not the one having the questions.
I linked to the wrong comment, that's all.
Dec 26, 2017 14:52:13 #
Dec 26, 2017 15:26:23 #
rstipe wrote:
Why would you stack all 3 ? I have the Kenko, but there's really not much difference between them & the Nikons. Why spend more than you have to?
Why not, to make a very small subject larger.
Dec 26, 2017 16:34:06 #
rstipe wrote:
Why would you stack all 3 ? I have the Kenko, but there's really not much difference between them & the Nikons. Why spend more than you have to?
Whenever a photographer needs 68mm of extension. Perhaps to use with a relatively short lens and photograph something teensy-tinsey - maybe angels dancing on the head of a pin. Or, perhaps, something relatively large, with a rather long lens & kinda far away - perhaps the head, mouth & fangs of a rattlesnake at maybe 3ft.
Dec 26, 2017 16:41:52 #
twowindsbear wrote:
Whenever a photographer needs 68mm of extension. Perhaps to use with a relatively short lens and photograph something teensy-tinsey - maybe angels dancing on the head of a pin. Or, perhaps, something relatively large, with a rather long lens & kinda far away - perhaps the head, mouth & fangs of a rattlesnake at maybe 3ft.
The issue of using multiple tubes on a short focal length lens is that you are right on top of your subject ( if the subject image isn’t inside the lens) and lighting becomes a major issue as does loss of light due to tubes.
Dec 26, 2017 19:32:22 #
twowindsbear wrote:
Thank you for your kind words! It seems I'm either totally ignored or told in no uncertain terms that I know nothing at all about what I post.
Deleted
Dec 27, 2017 00:43:50 #
francwoods wrote:
Hey @twowindsbear that did work! So these will work in manual only and will need to "move" to focus. I guess the AF in the marketing is a bit misleading. I notice that the tubes only have 7 contacts and my lenses and camera have 8. Would that make a difference?
They probably mean "auto" as in AE, "auto exposure".
Dec 27, 2017 01:32:04 #
RWR
Loc: La Mesa, CA
lamiaceae wrote:
They probably mean "auto" as in AE, "auto exposure".
They’re supposed to autofocus. (https://www.bhphotovideo.com/c/product/375238-REG/Kenko_AEXTUBEDGN_Auto_Extension_Tube_Set.html) The problem seems to have been because the OP wasn’t close enough at first.
Dec 27, 2017 04:24:29 #
RWR wrote:
They’re supposed to autofocus. (https://www.bhphotovideo.com/c/product/375238-REG/Kenko_AEXTUBEDGN_Auto_Extension_Tube_Set.html) The problem seems to have been because the OP wasn’t close enough at first.
They will auto focus if you are within the tube lens combo range!!!!! {sometimes}
Dec 27, 2017 10:29:13 #
Bugfan
Loc: Toronto, Canada
I have two sets of Kenko extension tubes both for Nikon. In ten years of using them I did have one go bad. Suddenly it wouldn't focus and the electrical connections seemed to be failing. Once in a while the aperture failed too. All the others work fine. So I'd try another tube to see what it does. It may be that you have a bad one which may need to be replaced.
There does not have to be a correlation between the number of contacts on the tubes and in the camera. The contacts you need are aperture and focus, a lot of other stuff isn't needed.
In terms of how to use them, if you're using a long macro lens - 150mm or 200mm - you can autofocus without too much trouble but use a single focus point to keep the focus on your subject. If you're using a shorter lens it's usually best to set the focus at minimum or maximum and then slowly move the camera in or out until you get a shart focus. This is done most effectively by using a tripod and a focusing rail ...
https://www.amazon.ca/s/?ie=UTF8&keywords=focusing+rail&tag=googcana-20&index=aps&hvadid=208333453589&hvpos=1t1&hvnetw=g&hvrand=14562975573442235403&hvpone=&hvptwo=&hvqmt=e&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9000894&hvtargid=kwd-307172291173&ref=pd_sl_6utnxu6ngx_e
Other than that just practice. It seems impossible and frustrating but with practice it becomes simple and you'll be amazed at what you can do with those tubes.
There does not have to be a correlation between the number of contacts on the tubes and in the camera. The contacts you need are aperture and focus, a lot of other stuff isn't needed.
In terms of how to use them, if you're using a long macro lens - 150mm or 200mm - you can autofocus without too much trouble but use a single focus point to keep the focus on your subject. If you're using a shorter lens it's usually best to set the focus at minimum or maximum and then slowly move the camera in or out until you get a shart focus. This is done most effectively by using a tripod and a focusing rail ...
https://www.amazon.ca/s/?ie=UTF8&keywords=focusing+rail&tag=googcana-20&index=aps&hvadid=208333453589&hvpos=1t1&hvnetw=g&hvrand=14562975573442235403&hvpone=&hvptwo=&hvqmt=e&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9000894&hvtargid=kwd-307172291173&ref=pd_sl_6utnxu6ngx_e
Other than that just practice. It seems impossible and frustrating but with practice it becomes simple and you'll be amazed at what you can do with those tubes.
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