Extenders for "mere mortal" Canon EF zoom lenses?

In message <KvGYc.2162$Gr2.1320@trnddc07>,
"Joshua Beall" <jbeall.DeleteThis@donotspam.remove.me.heraldic.us> wrote:

 >What about those of us with some "mere mortal" lenses like the EF 75-300mm
 >f/4-5.6 IS USM?

You can use almost any of the other brands, if it's for the Canon mount,
but frankly, using a teleconverter on the 75-300 IS not going to pull in
much more detail than the lens does without it, at a great cost in the
photon budget. A teleconverter can only magnify what a lens is doing.
If the sensor is the bottleneck, then a teleconverter will spread a
smaller area of the focal plane out over the sensor, and more detail can
be recorded than without it. If the lens itself is the bottleneck, then
the teleconverter can only magnify its limitations. On top of
magnifying the limitations, you will get further deterioration of the
image due to having less light to work with, and the need to shoot at
half the shutter time to compensate for the increased visibility of blur
from lens shake.

The 75-300 IS is soft at 300mm, and falls into the latter category.
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John P Sheehy <JPS.DeleteThis@no.komm>
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 >> Stay informed about: Extenders for "mere mortal" Canon EF zoom lenses? 

In message <2ph8faFkugb6U1.TakeThisOut@uni-berlin.de>,
Mark Spacey <vax2002news.TakeThisOut@tiscali.co.uk> wrote:

 >To be honest, they ALL ruin the image,

A sharp lens with a quality converter can give results almost as good as
the lens by itself.

 > blured edges,

You might want to try one that costs more than $60.

 >blown out colours,

Blown out colors? Where did you get that from?

 >intermitent auto focus

That depends. In any event, it is usually understood that you will give
up auto-focusing.
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John P Sheehy <JPS.TakeThisOut@no.komm>
  ><<> <>>< <>>< ><<> <>>< ><<> ><<> <>><<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Extenders for "mere mortal" Canon EF zoom lenses? 

JPS.TakeThisOut@no.komm wrote:
 > In message <2ph8faFkugb6U1.TakeThisOut@uni-berlin.de>,
 > Mark Spacey <vax2002news.TakeThisOut@tiscali.co.uk> wrote:
 >
 >
  >>To be honest, they ALL ruin the image,
 >
 >
 > A sharp lens with a quality converter can give results almost as good as
 > the lens by itself.
 >
 >
  >>blured edges,
 >
 >
 > You might want to try one that costs more than $60.
 >
forgive me I only tried A fellow photographers 2x ex extender on my 600
f4 L on my eos d1 mk2 at a Manchester United sports shoot, what do I know<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Extenders for "mere mortal" Canon EF zoom lenses? 

In message <2pmfp0Fn3q7cU1 RemoveThis @uni-berlin.de>,
Mark Spacey <vax2002news RemoveThis @tiscali.co.uk> wrote:

 >JPS@no.komm wrote:
  >> In message <2ph8faFkugb6U1 RemoveThis @uni-berlin.de>,
  >> Mark Spacey <vax2002news RemoveThis @tiscali.co.uk> wrote:
  >>
  >>
   >>>To be honest, they ALL ruin the image,
  >>
  >>
  >> A sharp lens with a quality converter can give results almost as good as
  >> the lens by itself.
  >>
  >>
   >>>blured edges,
  >>
  >>
  >> You might want to try one that costs more than $60.
  >>
 >forgive me I only tried A fellow photographers 2x ex extender on my 600
 >f4 L on my eos d1 mk2 at a Manchester United sports shoot, what do I know

I don't know what you know. That's why I am trying to get into more
detail.

When someone says "I've tried _that_", you really don't know what it is
that they've tried. I've run into several people, for example, who said
that they have found that the highlights blow out at the same point in
both RAW files and in the JPEGs on their 10Ds. Further investigation
uncovered the fact that they opened the RAW file in the Canon File
Viewer utility, and converted it. Of course, the FVU is a dumb program
obviously written by someone who didn't give a shit, and wrote it so
that it throws away a stop of green and blue, and a stop and a half of
red highlights, just like the RAW-JPEG firmware in the camera.

In any event, 3 teleconverters that are known to be good quality for
Canon mount lenses are the Canons, the Kenko Pro 300 series, and the
Tamron SP series (which are the Kenko Pros relabeled).
--

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John P Sheehy <JPS RemoveThis @no.komm>
  ><<> <>>< <>>< ><<> <>>< ><<> ><<> <>><<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Extenders for "mere mortal" Canon EF zoom lenses?