At 10:50 AM -0400 12/21/00, Terry Danks wrote:
>K K Hui wrote:
>>
>>The lens definitely
>> needs to be stopped down to achieve sharp image when used with either
>> the EF1.4x or EF2x converters. At least that is my personal experience.
>> In fact this is further confirmed if you take a look at Canon's
>> published MTF charts in their EF Lens Work II.
>
>
>If I need to stop down the 400/2.8 to 5.6 for satisfactory results I'd rather
>obviously prefer to carry (not to mention pay for!) the 400/5.6 instead.
>There must be something wrong here.
Well he's talking about stopping it down when using it with the
teleconverter so you're no longer talking about a 400, but a 560 and an
800mm lens equivalent that should be able to autofocus with my EOS cameras
since at worst at wide open it would be an 5.6 with the 2x. Teleconverters
are always going to soften the image to some extent. I would assume that
the 600/4 prime would be sharper than the 400/2.8 with a 1.4x when it's
wide open.
Shawn Knapp
Staff Photographer
The Times
251 East Clinton Street
Frankfort, IN 46041
Phone: 765-659-4622
Fax: 765-654-7031
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