1) Yes, within limits, oranges to oranges, as it were. Best glass to best
glass, the Sigmas hold their own optically, but are not as well built as
some, and there's that compatibility problem.
2) Yes, again within the same limits. The best Canon glass is as good as it
gets, the bottom of the stack is, while not stellar, better than the bottom
of the stack from aftermarket mfrs.
Your 28-90 is better, for instance than the Sigma 28-105 f2..8-4, which is
truly dire.
3) Everybody has apochromatic glass, and all have some form of low
dispersion elements, too, generally farther up the product line. Tokina ATX
Pro, (the 28-80 f2.8 I mentioned earlier is an example) Sigma EX and Canon L
fit that description, having both types of glass. Some of Canon's consumer
line has apochromatic glass, too, as do some of the other mfrs'.
4) Yes USM is about speed and silence, but they are usually better optically
than non USM lenses. Not always, but usually. There are exceptions, the
old 100-300 f5.6 L was not a USM lens, but was superior optically to the non
"L" lens. Be advised, there are two types of USM, "micromotor" USM, which
uses an improved version of the standard lens' motor, and "ring" USM, often
referred to as "true" USM, which has a true ultrasonic ring motor in it.
There is no way to infer which is which in the product description, but
"ring" USM has a non rotating front element, critical if you are using a
filter which has an orientation, like a polarizing filter. "Ring" USM
lenses are also a little quieter and faster focusing than their micromotor
USM brethren.
5) I'd say the extra money is worth it, I feel limited by the one focus
point. With 5 focus points, you can change to the one closest to the
subject or the part of the image you want to focus on, and you can connect
the spot meter to that focus point, so you can meter from the same area.
An argument can be made for the EOS5, it has the same 5 focus points and
spot meter, though coverage is slightly larger (something critically missing
from the 50, IMHO), faster frame rate, a built in flash with a zoom feature.
It is the command dial that has a habit of breaking, but if this has been
repaired, the repair is permanent. I've had my A2 for nearly 5 years, and
it hasn't broken...yet.
As an aside, my wife has an Elan II, the same as your 50E, but without eye
control. She loves it, and has gotten excellent results. She has been
jurored into countless shows and taken many awards, both locally and
nationally. It's a good little camera!
--
Skip Middleton
<a style='text-decoration: underline;' href="http://www.shadowcatcherimagery.com" target="_blank">www.shadowcatcherimagery.com</a>
"Deathwalker" <ian-lincoln RemoveThis @blueyonder.co.uk> wrote in message
news:ex0hb.1712$P06.15238190@news-text.cableinet.net...
>
> >
> Ok. I have a 80-200 sigma that doesn't reliably work with the 50E. Had
> the camera and lense checked they concluded same as yourself. I thought
> they would say that canon only was best for their own reasons you seem to
be
> justifying that suspicion. They didn't mention tokina and tamron which
they
> obviously should have.
>
> Rang sigma and they reckoned the diaphragm contact was breaking down
hence
> the intermediate fault. They said if it was incompatibility it would work
> or it wouldn't. Anyway after coming back from local camera shop the thing
> is working. Sigma want £60 to just look at lense and attempt fix.
probably
> not worth that. Probably work on eos 5 or eos 1000.
>
> Local shop gave me my repair deposit back as yes there was a fault and no
> they couldn't fix it. So they ain't all bad.
>
> They also blamed the poor focusing performance on my cheap replacement
film
> instead of konica fuji or kodak.
>
> Given the choice i prefer fuji. Their frontier machines are brilliant
> too. I use fuji own process paid slide film too.
>
> 1.so on balance you would recommend tokina and tamron over sigma?
> 2.Is the extra to buy genuine canon glass worth it?
> 3.Do tokina and tamron do this apo glass? I believe there is some kind of
> crystal that qualifies the APO (Apochromatic) it having a better
refraction
> index than normal. Seen adverts for canon and sigma but not the
> other two.
>
> 4.USM may be better than canon standard but its about speed and quiet not
> optical?
>
> 5. If i bought an eos 1 would i be better spending the extra to get the
1n?
>
>
>
> To be honest after seeing the results with the 50E and the failure of the
> sigma lense i gave up photography for years. Just regretted selling my A1
> with FD 70-210 (with f4 through all the focal lengths) lens too much.
That
> had a trombone arrangement so focus and focal length was the one grip.
> Great for doing night zoom effects. Massive enlargements possible pin
> sharp.
>
> Anyway picked up the camera again and joined southgate photographic
society.
> Vast majority of members retired. Most are lrps or some such. There are
> five of us in the beginners group the rest are advanced. I ended up
buying
> a minolta dimage scan elite II and a canon i850 printer. Still not
winning
> any comps. Not even getting placed. One of the guys is a carpenter so i
> have a device for making framed mounts out of dala. Now they're judging
me
> on the edges of my frames and choice of colour sheesh!
>
><!-- ~MESSAGE_AFTER~ -->
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