Teleconverters and their effect on focal range

Discussion in 'Photography Beginners' Forum' started by jubbin2001, Jul 22, 2010.

  1. jubbin2001

    jubbin2001 TPF Noob!

    Joined:
    Dec 26, 2008
    Messages:
    153
    Likes Received:
    15
    Can others edit my Photos:
    Photos OK to edit
    Just curious how much teleconverters affect focal range. I have a Tamron 90mm macro that when shooting 1:1 I have to be really close, let's say 4". Now lets say I order a 2x teleconverter. Does that mean while shooting at 8" 1:2, I am actually shooting 1:1 (since I have effectively doubled the image using the 2x teleconverter)? The numbers aren't exact, I am just trying to get an idea of the concept behind them. I just wish I could get a little more distance away from my subject with the 90mm, since really skittish things tend to disappear when I get close enough to focus at 1:1. If infact this is how they work, perhaps a 1.4x or 1.7x might be in my forseeable future (I haven't heard much good about the 2x, but the 1.7x and 1.4x seem to be well respected). Thanks all.
     
  2. Taylor510ce

    Taylor510ce TPF Noob!

    Joined:
    Jul 20, 2010
    Messages:
    702
    Likes Received:
    1
    Location:
    United States
    Can others edit my Photos:
    Photos NOT OK to edit
    The minimum focus distance is what you are asking about. A Teleconverter will do what you are looking for, allowing you to get some distance between you and your subject. Extension tubes will do the opposite, allow you to focus closer.

    Also, in most cases the 2x teleconverters degrade the image too much. This may not be the case with Canon and Nikon converters ( never used them but hear great things ) I have a Kenko Pro 300 1.4x and love it.
     
  3. jubbin2001

    jubbin2001 TPF Noob!

    Joined:
    Dec 26, 2008
    Messages:
    153
    Likes Received:
    15
    Can others edit my Photos:
    Photos OK to edit
    Thanks tons! I thought that is how it went, but I wanted to make sure.
     
  4. Dao

    Dao No longer a newbie, moving up!

    Joined:
    Mar 24, 2008
    Messages:
    6,252
    Likes Received:
    418
    Location:
    St. Louis
    Besides, the 2x TC will rob 2 stops of lights vs 1 with 1.4x.
     
  5. jubbin2001

    jubbin2001 TPF Noob!

    Joined:
    Dec 26, 2008
    Messages:
    153
    Likes Received:
    15
    Can others edit my Photos:
    Photos OK to edit
    Right right. I wasn't going to get a 2x, I was actually just using it for the ease of math involved. I ended up picking up a Tamron SP 1.4x fairly cheap, so we'll see how it goes. Thanks for the replies!
     

Share This Page

Search tags for this page

do teleconverters effect focus

,

do teleconverters effect minimum focus distance?

,
effect of teleconverter on macro
,
how do camera tele-converters affect close focusing distance
,

how does 2x teleconverter affect focal length

,
how teleconverter affect minimum focusing distance
,

tamron 90mm effect

,

tamron 90mm macro teleconverter

,
teleconverter effect on minimum focus distance
,
teleconverters and focus length effect