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Extension tube question
May 28, 2015 09:54:15 #
wolfiebear wrote:
1) Can extension tube contacts potentially mess up the camera contacts?
2) Can anybody explain the set-up in the attached picture to me, as it is different than all the other tube set-ups I see.?
2) Can anybody explain the set-up in the attached picture to me, as it is different than all the other tube set-ups I see.?
To question 1, I would expect NOT. As long as the device is built to be used with the camera in question.
Question 2, the third part is overkill in my estimation. Why not just use plain old extension tubes made to allow electrical connection of the camera to the lens?
May 28, 2015 10:00:36 #
BobHartung wrote:
...Question 2, the third part is overkill in my estimation. Why not just use plain old extension tubes made to allow electrical connection of the camera to the lens?
because the lens is reversed it is not overkill,
May 28, 2015 10:04:42 #
oldtigger wrote:
because the lens is reversed it is not overkill,
In the third photo the lens is clearly NOT reversed.
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May 28, 2015 10:07:03 #
BobHartung wrote:
In the third photo the lens is clearly NOT reversed.
And that is of consequence why?
May 28, 2015 10:08:35 #
oldtigger wrote:
And that is of consequence why?
If you only need extension and not a connection for to stop down the iris at the time of exposure, why would you want to insert another layer of electronics and not just just Plain Old Extension Tubes?
May 28, 2015 10:15:16 #
wolfiebear wrote:
1) Can extension tube contacts potentially mess up the camera contacts?
2) Can anybody explain the set-up in the attached picture to me, as it is different than all the other tube set-ups I see.?
2) Can anybody explain the set-up in the attached picture to me, as it is different than all the other tube set-ups I see.?
I think the third picture is just showing the use of the two rings together for more extension as you might with a set of two or three regular rings. In this case the hard wiring my be redundant to the two sets of contacts on each ring. What are you going to do, cut of the wire when not needed? Yes, they might have shown a view of the set-up with the lens reversed if they intend for the two rings to be used that way.
On a related set up but not likely possibly with "auto" anything. Coupling two lenses front to front can be interesting. A lot of glass but can be fun for experimenting with various magnifications.
May 28, 2015 10:16:01 #
BobHartung wrote:
If you only need extension and not a connection for to stop down the iris at the time of exposure, why would you want to insert another layer of electronics and not just just Plain Old Extension Tubes?
it would save the trouble of carrying extension tubes.
Auto tubes would add those electronic layers also.
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May 28, 2015 10:16:14 #
BobHartung wrote:
If you only need extension and not a connection for to stop down the iris at the time of exposure, why would you want to insert another layer of electronics and not just just Plain Old Extension Tubes?
it would save the trouble of carrying extension tubes.
Auto tubes would add those electronic layers also.
May 28, 2015 10:17:28 #
BobHartung wrote:
If you only need extension and not a connection for to stop down the iris at the time of exposure, why would you want to insert another layer of electronics and not just just Plain Old Extension Tubes?
The manufacturer does seem to have a Swiss Army Knife type of macro unit here for an all in one versatility product. I just wish it had a bottle opener or a cork screw built in. :lol:
May 28, 2015 12:50:40 #
NormanHarley wrote:
The manufacturer does seem to have a Swiss Army Knife type of macro unit here for an all in one versatility product. I just wish it had a bottle opener or a cork screw built in. :lol:
Either would do. You would know what liquid libation to bring along while you were crawling about with those little creepy crawly things. :D :D
May 28, 2015 14:38:52 #
lamiaceae wrote:
. . . . , why would would one care about having AF for ultra-macro use? I do fine with my Pentax with Extension Tubes and or a Bellows and Focusing Rail.
Yeah. . .and I find that interesting because most of the pricier tubes come with autofocus. Seems to me that metering would be more practical than autofocus, but none of them see to offer that. . .possibly for a reason. . .like it can't be done(??
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May 28, 2015 14:41:09 #
Leitz
Loc: Solms
BobHartung wrote:
In the third photo the lens is clearly NOT reversed.
In the first picture the lens is clearly reversed.
May 28, 2015 14:53:55 #
Leitz
Loc: Solms
wolfiebear wrote:
Yeah. . .and I find that interesting because most of the pricier tubes come with autofocus. Seems to me that metering would be more practical than autofocus, but none of them see to offer that. . .possibly for a reason. . .like it can't be done(??
All tubes with electrical connections offer open-aperture metering.
May 28, 2015 15:16:02 #
wolfiebear wrote:
Yeah. . .and I find that interesting because most of the pricier tubes come with autofocus. Seems to me that metering would be more practical than autofocus, but none of them see to offer that. . .possibly for a reason. . .like it can't be done(??
My kenko auto tubes meter/stop down and focus just like most of the other auto tubes.
Some of the nikon $200 auto tubes only meter/stop down.
This and its $500 competitor are the only ones i've seen that pass those functions on to reversed or lenses on bellows.
May 28, 2015 16:39:59 #
wolfiebear wrote:
Yeah. . .and I find that interesting because most of the pricier tubes come with autofocus. Seems to me that metering would be more practical than autofocus, but none of them see to offer that. . .possibly for a reason. . .like it can't be done(??
Actually most tube sets do allow metering or auto exposure, only the cheapest (not bad) ones are all manual.
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