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Cameras, Lenses and Accessories: Discuss Kenko Extension Tube Set DG...Anyone got these? : - Kenko Auto Extension Tube Set DG THK Photo Products, Inc. What do you think of ...
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Old 13-07-2006, 14:02   #1 (permalink)
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Kenko Extension Tube Set DG

Anyone got these? : -
Kenko Auto Extension Tube Set DG
THK Photo Products, Inc.


What do you think of them? Do they do the job well?

Seems vastly cheaper than buying a macro lens so I'm wondering what the downside is...
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Old 13-07-2006, 14:32   #2 (permalink)
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Re: Kenko Extension Tube Set DG

Stepheno is better placed to advise after his thread here :- http://www.pixalo.com/community/phot...mens-6892.html
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Old 13-07-2006, 15:11   #3 (permalink)
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Re: Kenko Extension Tube Set DG

ta. posted there instead
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Old 13-07-2006, 15:33   #4 (permalink)
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Re: Kenko Extension Tube Set DG

I have and use the Jessops equivalent set. Other than having a different name on the side they are identical (although more expensive) but as I needed them in a hurry I took the hit.

What would you like to know?
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Old 13-07-2006, 15:37   #5 (permalink)
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Re: Kenko Extension Tube Set DG

Edit just followed the link

For macro work (especially with extention tubes) you are better using manual focus as the dof becomes very small indeed. The kenko and Jessops tubes will both maintain AF if you want it to though. With regard to closest focus distance then it depends on which tube and with which lens you are using it but uisng the largest tube (or combination of tubes as they can be stacked) will get you so close that the front of your lens will be touching the subject matter.
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Old 13-07-2006, 15:41   #6 (permalink)
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Re: Kenko Extension Tube Set DG

Might as well take real world examples.

I have a 70-300mm which has an MFD of 1.5m, using the smallest tube (12mm) what will that bring the MFD down to? Is there a formula where you can work it out?
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Old 13-07-2006, 15:44   #7 (permalink)
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Re: Kenko Extension Tube Set DG

Thats a bit technical

being serious for a moment, I am sure that there is a formula although I don't know it and unfortunately I don't own a 70-300 lens that I could try it with for you.
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Old 14-07-2006, 00:02   #8 (permalink)
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Re: Kenko Extension Tube Set DG

Found this which might help

Fd=Fl + (Fl*Fl/E) or FL plus (FL squared divided by E)
Where: Fd=focus distance, Fl=focal length of lens, and E=extension from the camera body

Fd=300 + (300*300/12)
90000/12=7500+300
7800

7800 what, mm? obviously not

Last edited by neos; 14-07-2006 at 00:09.
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Old 14-07-2006, 00:43   #9 (permalink)
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Re: Kenko Extension Tube Set DG

dunno, looks plausible to me thanks.
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Old 17-07-2006, 13:57   #10 (permalink)
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Re: Kenko Extension Tube Set DG

Quote:
Originally Posted by neos
Found this which might help

Fd=Fl + (Fl*Fl/E) or FL plus (FL squared divided by E)
Where: Fd=focus distance, Fl=focal length of lens, and E=extension from the camera body

Fd=300 + (300*300/12)
90000/12=7500+300
7800

7800 what, mm? obviously not

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Old 17-07-2006, 17:56   #11 (permalink)
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Re: Kenko Extension Tube Set DG

I'll find out soon enough. See if I can work out some sort of formula
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Old 17-07-2006, 18:05   #12 (permalink)
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Re: Kenko Extension Tube Set DG

Quote:
Originally Posted by orangepeel
See if I can work out some sort of formula
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Old 18-07-2006, 09:09   #13 (permalink)
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Re: Kenko Extension Tube Set DG

OP asked about MFD with extension tubes on this thread

I still don't know the actual distances but to give you some idea of effects of the tubes I took some quick shots. They are all hand held so don't be too critical. On the first the FD is about 18 inches and on the last one the lens is touching the flower.

50mm 1.8 only


50mm + 13mm tube


50mm+13mm+21mm tubes


50mm+13mm+21mm+31mm tubes


Hope that helps some.

PS - forget to add that these are the Jessops tubes but they are identical to Kenko.
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Old 18-07-2006, 09:12   #14 (permalink)
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Re: Kenko Extension Tube Set DG

thanks
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