Can't focus with extension rings on Canon

Discussion in 'Photography Equipment & Products' started by Aquarium Dreams, Mar 8, 2007.

  1. Aquarium Dreams

    Aquarium Dreams TPF Noob!

    Joined:
    Jan 14, 2007
    Messages:
    731
    Likes Received:
    0
    Can others edit my Photos:
    Photos OK to edit
    I have some Kenko extension rings and when I attach them to my camera (400D) and lens, the camera won't focus. I've tried manual and auto focus and various combinations of rings with different lenses, all to no avail. I'm thinking about returning them, but others seem to have great results with these. Am I doing something wrong?
     
  2. TomHuck-wa

    TomHuck-wa TPF Noob!

    Joined:
    Jan 20, 2007
    Messages:
    81
    Likes Received:
    0
    Location:
    South central Washington state
    Can others edit my Photos:
    Photos OK to edit
    I have Kenko rings, and a 20D, they work fine. You will have a very narrow fov, mine is out there a ways with the 200 lens. Put the rings and lens on, find a contrasting spot, (I used a doorknob on a white door) look thru the viewfinder and move back and forth from 1 foot to 6 feet or so very slowly, depress the shutter button half way every foot or so, till you see if it starts to bring the subject into focus. Hope this works for you.
     
  3. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

    Joined:
    Dec 16, 2003
    Messages:
    33,817
    Likes Received:
    1,811
    Location:
    Edmonton
    Can others edit my Photos:
    Photos NOT OK to edit
    I agree with that. Your depth of field will be extremely narrow...and I believe that extension tubes also prevent your lens for focusing at infinity. With the tube on, start with the lens very close to something and slowly move back until you find where your working distance will be.
     
  4. Aquarium Dreams

    Aquarium Dreams TPF Noob!

    Joined:
    Jan 14, 2007
    Messages:
    731
    Likes Received:
    0
    Can others edit my Photos:
    Photos OK to edit
    Thanks, and WOW, you two weren't kinding about the narrow focus. The wider the lens, the closer I have to be to focus with an extension ring. I added the 12mm ring to my 28mm lens on the 400d and there might have been space to slide a couple playing cards between the front element and the surface in focus. Every combination of lens and rings focused really close. 300mm with all three rings focused at about four feet and my cat's eye filled a quarter of the frame. Is this normal? I suppose I was expecting more of a telephoto effect versus the macro effect I'm getting. These could be fun, but they're not exactly what I thought they would be.
     
  5. 250Gimp

    250Gimp TPF Noob!

    Joined:
    Oct 3, 2006
    Messages:
    1,031
    Likes Received:
    0
    Location:
    Chelsea, Quebec
    Can others edit my Photos:
    Photos OK to edit
    Extension Tubes are for macro type work. They allow you to focus with the lense closer to the subject than without.

    If you were wanting more zoom than you would need a tele-converter to magnify your zoom lense.

    Cheers
     
  6. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

    Joined:
    Dec 16, 2003
    Messages:
    33,817
    Likes Received:
    1,811
    Location:
    Edmonton
    Can others edit my Photos:
    Photos NOT OK to edit
    :thumbup:
     
  7. Digital Matt

    Digital Matt alter ego: Analog Matt

    Joined:
    Jan 30, 2004
    Messages:
    5,346
    Likes Received:
    65
    Location:
    Santa Barbara, CA
    Can others edit my Photos:
    Photos NOT OK to edit
    Extension tubes are for macro photography. They take away your infinity focus and allow you to focus closer. Using all 3 kenko tubes (65mm) on a 50mm, gives you better than 1:1 reproduction.
     
  8. Aquarium Dreams

    Aquarium Dreams TPF Noob!

    Joined:
    Jan 14, 2007
    Messages:
    731
    Likes Received:
    0
    Can others edit my Photos:
    Photos OK to edit
    :lmao: Well, now I wish I had done more research before buying. In my defense, I read an article that suggested buying these with my 24mm TS lens to "get more miles out the lens," or something to that effect, and I assumed by miles the writer meant millimeters. That's what I get for assuming instead of asking.

    That might just make these babies worth keeping.

    Thanks everyone.:)
     

Share This Page

Search tags for this page

can't focus with canon extension tube

,
can't get extension tubes for lens to focus
,
cannot focus extension tubes with 50mm lens
,
cannot focus using macro tube
,
cant focus using extension ring
,
extension tube can't focus
,
extension tubes canon unable to focus
,
extension tubes cant focus
,
i cannot focus with extension tubes on my 28mm
,
my camera can't focus with extension tube