Ugly Hedgehog® - Photography Forum
HELP Please with Kenko Auto Extension Tube Set DG
Dec 27, 2014 23:42:51   #
swallowtail Loc: Melbourne, Australia
 
Hi, Hope you all had a good Christmas. I was given a set of the Kenko tubes for my birthday in August and hadn't used them yet, for Christmas I was given a Velbon Super Mag Slider. So, today I decided to test them out, the slider seems to work fine but I can't get the extension tubes to focus. I have a Canon EOS 350D with the Canon 100mmL Lense, I put on the 12mm ring onto the camera body, then attached the lense, have had the camera set on M and AV, also the lens set on Auto and Manual focus, have tried all 3 lengths that are on the side of the lens and tried it inside and outside. I'm obviously doing something wrong. Please can someone help me, I'm very new to this. Thanks Anne

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Dec 28, 2014 00:07:17   #
LoneRangeFinder Loc: Left field
 
I'll defer to the Canon owners for how A-F works. I guess I would check the contact points and make sure the camera, tubes, & lens are all completed seated. I have a complete set and never had focusing issues.

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Dec 28, 2014 00:21:12   #
swallowtail Loc: Melbourne, Australia
 
LoneRangeFinder wrote:
I'll defer to the Canon owners for how AF works. I guess I would check the contact points and make sure the camera, tubes, & lens are all completed seated. I have a complete set and never had focusing issues
Thanks, I'll check that.

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Dec 28, 2014 01:43:28   #
Nikonian72 Loc: Long Beach CA
 
In order for Extension Tubes to work as designed, your camera lens must be set to Minimum Focusing Distance.
WITHOUT tubes, a Canon 100-mm lens at MFD, focuses at about 5.9-inches (Minimum Working Distance). WITH tubes, Working Distance is even less. The longer the ETs, the shorter the WD.

With any length tube between camera & lens, your lens cannot focus to infinity, but it can focus very close.

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Dec 28, 2014 02:38:26   #
swallowtail Loc: Melbourne, Australia
 
Nikonian72 wrote:
In order for Extension Tubes to work as designed, your camera lens must be set to Minimum Focusing Distance.
WITHOUT tubes, a Canon 100-mm lens at MFD, focuses at about 5.9-inches (Minimum Working Distance). WITH tubes, Working Distance is even less. The longer the ETs, the shorter the WD.
Thank You So Much, just tried it out quickly and it worked. Am I right in thinking that the more Extension Tubes I put on the closer I will need to be?

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Dec 28, 2014 02:43:30   #
swallowtail Loc: Melbourne, Australia
 
Can I ask another silly question? Is the camera better set at f32 rather than f2.8?

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Dec 28, 2014 03:01:54   #
oldtigger Loc: Roanoke Virginia-USA
 
swallowtail wrote:
Is the camera better set at f32 rather than f2.8?
Better at f/8, bad at f/22 or f/32

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Dec 28, 2014 03:09:24   #
swallowtail Loc: Melbourne, Australia
 
oldtigger wrote:
Better at f/8, bad at f/22-32
Thanks oldtigger, will try tomorrow.

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Dec 28, 2014 09:44:38   #
kubota king Loc: NW , Pa.
 
swallowtail wrote:
Am I right in thinking that the more Extension Tubes I put on the closer I will need to be?
I have these too. To answer your question, yes. The more of them you add the closer you must get with any lens you use. Be careful you don't slam your lens into the subject trying to focus because you have to get too close,Tommy

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Dec 28, 2014 12:27:23   #
Screamin Scott Loc: Marshfield Wi, Baltimore Md, now Dallas Ga
 
oldtigger wrote:
Better at f/8, bad at f/22 or f/32
While diffraction (which degrades sharpness) rears it's ugly head starting at about f/11, don't let that stop you from stopping down further

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Dec 29, 2014 19:05:25   #
Nikonian72 Loc: Long Beach CA
 
swallowtail wrote:
Am I right in thinking that the more Extension Tubes I put on the closer I will need to be?
The longer the Extension Tube(s), the shorter the Working Distance.

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Dec 29, 2014 19:06:33   #
Nikonian72 Loc: Long Beach CA
 
swallowtail wrote:
Is the camera better set at f32 rather than f2.8?
FAQ: Why are my Digital Images Sharper at f/8 than f/22?
http://www.uglyhedgehog.com/t-59819-1.html

Please read ALL of these: http://www.uglyhedgehog.com/t-36372-1.html

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Jul 3, 2020 20:36:41   #
Silverrails
 
Nikonian72 wrote:
In order for Extension Tubes to work as designed, your camera lens must be set to Minimum Focusing Distance.
WITHOUT tubes, a Canon 100-mm lens at MFD, focuses at about 5.9-inches (Minimum Working Distance). WITH tubes, Working Distance is even less. The longer the ETs, the shorter the WD.

With any length tube between camera & lens, your lens cannot focus to infinity, but it can focus very close.


Someone told me always use manual mode and manual Focus, is that an accurate suggestion?
I just recieved my order of set of 3 Kenko Auto Extension tubes for my F-mount Nikon, tried them out all together with my 50mm 1.8g lens on my Nikon D3300

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Jul 4, 2020 07:55:24   #
Mark Sturtevant Loc: Grand Blanc, MI
 
This is from 2014.

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Jul 5, 2020 13:38:06   #
Silverrails
 
swallowtail wrote:
Hi, Hope you all had a good Christmas. I was given a set of the Kenko tubes for my birthday in August and hadn't used them yet, for Christmas I was given a Velbon Super Mag Slider. So, today I decided to test them out, the slider seems to work fine but I can't get the extension tubes to focus. I have a Canon EOS 350D with the Canon 100mmL Lense, I put on the 12mm ring onto the camera body, then attached the lense, have had the camera set on M and AV, also the lens set on Auto and Manual focus, have tried all 3 lengths that are on the side of the lens and tried it inside and outside. I'm obviously doing something wrong. Please can someone help me, I'm very new to this. Thanks Anne
Hi, Hope you all had a good Christmas. I was given... (show quote)

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