Teleconverter "AGAIN"

Discussion in 'Beginner Questions' started by Pete.c, Jul 11, 2019.

  1. Pete.c

    Pete.c Member

    Joined:
    Oct 13, 2018
    Messages:
    37
    Equipment:
    Canon EOS 4000D
    Hi guys,

    Sorry for bothering you again with this subject, being a beginner I'm a bit of a numb skull.
    I have a sigma lens with a f5.6 what will the size be with a 1.4x converter
    . And the second question is I have a sigma lens with f6.3 what would the size be with a 1.4x converter.
    I don't want to pass f8 as I would loose auto focus. And I don't want to waste my money as I need it to be auto focus.

    Thank you all.

    Pete.
     

  2. johnsey

    johnsey Site Moderator Staff Member Site Supporter

    Joined:
    Apr 21, 2017
    Messages:
    402
    Location:
    Fargo, ND
    Equipment:
    5dMk2, 20D, 70-200 2.8 L IS, 100mm 2.8 Macro USM, 50m 1.4, 85mm 1.8, 17-40mm 4.0 L, Rokinon 14mm 2.8; Pixma Pro-100
    You will lose 1 stop of light with a 1.4, 2 if you had a 2.0. This is because you extended the length of the lens with this added barrel. At 6.3 will be effectively as dark as using it at 8 without the converter. Hope this helps.
     
  3. Pete.c

    Pete.c Member

    Joined:
    Oct 13, 2018
    Messages:
    37
    Equipment:
    Canon EOS 4000D
    So it looks like I can use a teleconverter then. Hopefully. Just as I have notice the stop working at f8.
     
  4. Pete.c

    Pete.c Member

    Joined:
    Oct 13, 2018
    Messages:
    37
    Equipment:
    Canon EOS 4000D
    Hi guys,
    Well I purchased a 1.4x converter, only a cheap one so I didn't was my money if it didn't work . And it works just fine it even worked up to f11, can't understand how, but mainly at f9. So shortly a better quality teleconverter will be purchased.

    Thanks all for your help.
    Pete
     

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