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    11 May 2009 - 5:56 PM

    I am thinking of buying a Canon 2X MKII Tele Converter Extender 2 X MK II to enhance my current kit but not sure if I would get the results I anticipate.
    I intend using it with my Canon EF 300mm f4 IS prime lens to take it out to 600mm. Will the AF still work? I gather I will lose two f stops? Any other hidden problems??

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    geoffash26  102506 forum posts United Kingdom
    11 May 2009 - 6:05 PM

    You will loose quality and AF on your 40d would only recommend a 1.4x
    with that lens and you will still get AF centre point only I believe and good quality

    Last Modified By geoffash26 at 11 May 2009 - 6:05 PM
    stevie e2 Member 101198 forum postsstevie vcard United Kingdom2 Constructive Critique Points
    11 May 2009 - 6:35 PM

    I have the 300 F4 and have both 1.4X & 2X converters. The results with the 1.4 are fine; with the 2X the quality (contrast & sharpness) goes down quite a bit - not awful but enough for me to use this combination for 'emergencies' only. AF won't work except centre point with Canon 1 series bodies. There is a 'tape the contacts' trick on non-series 1 bodies (see elsewhere on this forum) but that sent the AF into sort of 'spasms' when I tried it.

    11 May 2009 - 10:05 PM

    Thanks guys. Guess it'll have to be the 1.4. My main reason is that I am about to shoot Peregrins but for obvious reasons can't get too close. I had heard that there were all sorts of issues using the 2X and now I know.

    StrayCat e2 Member 1014929 forum postsStrayCat vcard Canada2 Constructive Critique Points
    11 May 2009 - 10:51 PM

    IMO, I would sell the 300mm and get a Canon 400mm f5.6. This is an excellent lens for bird photography, including one of the very best for birds in flight.

    12 May 2009 - 9:07 AM

    Umm, food for thought. The main problem there is the amount of cash I'd have to find as I doubt I'd get any where near the 900 needed for the 400mm by selling my 300mm. Apart from that, I LOVE my 300. I've had great results over the years.

    geniehawk  7181 forum posts England
    12 May 2009 - 9:22 AM

    If the lens is needed for a specific shoot would it not be possible to hire one for the immediate use?


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