Adding a 3x Converter to a 135mm Prime

Discussion in 'Photography Beginners' Forum' started by AgentDrex, Sep 16, 2010.

  1. AgentDrex

    AgentDrex No longer a newbie, moving up!

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    What equivalent focal length will I get and what types of photos would I shooting with this setup?
     
  2. SrBiscuit

    SrBiscuit TPF Noob!

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    well if im not mistaken (and i may very well be)...

    135*3=405*1.5=607.5mm

    how fast is the prime?
    you likely lose a few stops...im sure someone will know exactly how many.
     
  3. Infidel

    Infidel TPF Noob!

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    Um, 405mm? Depending on the final aperture, autofocus performance will likely suffer a great deal.
     
  4. reznap

    reznap No longer a newbie, moving up!

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    I didn't think you could get them past 2x. You'd have a 405mm prime that loses like 9 stops of light, I think - but I'm probably off on the stops, just a guess.

    Not sure what it would be useful for tbh.. and you'd need a tripod.
     
  5. AgentDrex

    AgentDrex No longer a newbie, moving up!

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    You're the infidel talking about autofocus...its manual focus...an old Hanimex lens and I also have a 3x converter for it...I'll be using that on my 1000D once I get the adapter tomorrow...hopefully...just wondering how far out I'm going to be able to photo with that set up...I do have a tripod...and have noticed the light loss...I'm also getting a ball-head tripod soon so I don't have to use this one I've been borrowing from work...
     
  6. Ryan L

    Ryan L TPF Noob!

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    135x3=405mm you will have 3 stops of light loss and should autofocus with a lens 2.8 for faster. I am pretty sure you are looking at the Kenko 3x converter?
     
  7. Ryan L

    Ryan L TPF Noob!

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    since its not the Kenko disregard the above post! Lol
     
  8. Taylor510ce

    Taylor510ce TPF Noob!

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    Your xs actually has a 1.6 crop factor so the focal length will be a little longer 648mm by my calculations with 3 stops of loss for the TC. If thw prime lens is a 2.8 you are looking at f/8?? Dont expect much, I am guessing the sharpness and IQ is going to be terrible. It was for me with only a 2x kenko. I have shot at f8 with a 70-300mm and 1.4x outdoors with good results though.
     
  9. AgentDrex

    AgentDrex No longer a newbie, moving up!

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    Here's my setup:

    [​IMG]
     
  10. kundalini

    kundalini Been spending a lot of time on here!

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    FOLKS........
    The focal length does not change because you are using a cropped sensor camera.
     
  11. Infidel

    Infidel TPF Noob!

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    ...and you're the AgentDrex who didn't mention that in the OP :mrgreen:! I all seriousness, I thought that issue could have an impact on how you intend to use the lens, which you did ask about.
     
  12. Infidel

    Infidel TPF Noob!

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    Good point, although he did ask about equivalent focal length in the OP, which is probably why some have included crop factor in their calculations.
     

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