Luminous Landscape Forum
Equipment & Techniques => Cameras, Lenses and Shooting gear => Topic started by: cowboy on July 08, 2007, 10:18:53 pm
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Can anyone advise me on a tele extender 1.4x or a 2x for a Tamron 70-300 used on an XTi. Is it a reasonable thing to do? Also have a Canon zoom 28-80mm. I haven't had much luck finding anything by searching. Any advice is helpful. I normally shoot using a tripod. Use is mixed because I am still exploring possibilities.
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You'll lose AF with a TC and that tamron lens.
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The technical support people for Canon advized me to get a 70-200 zoom PLUS a 1.4 extender on Friday after the 4th of July. Their statement was that one keeps auto focus with the 1.4X extender, but not with the 2X extender. You loose one f stop with the 1.4 extender. I understand from other sources that you loose 2 f stops with a 2X extender.
Canon tech support tells me that the 75-200 f/f L telephoto will be more sharp with a 1.4X extender than the low end 75-300 EF-S lens that I have. Hope some of this is relevant to your situation.
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The 70-200f4 with TC will still AF as it is a constant f4. The tamron is f5.6 at the end of the zoom range. So it is already at the limit of AF at that point.
Oh, and the 70-200f4 with TC is an extremely effective combination. Get the IS version, tho, as it does get dark with the TC.
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Thank you both for the info. It answered my questions and helped me plan a direction.
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If you get a chance to post some of the shots you do with this combination and even better yet, explain them, that wodl be really great. Good luck on your trip.