Canon zoom lens
Discussion
I currently use a Sigma 70-300 f4.5 lens as my long distance lens for, most stuff really that isn't close up or landscape, usually cars planes, or people doing some form of sport. I know its not the fastest lens in the world, which can be limiting but I don't have the money to go faster. However it now won't focus properly beyond 200mm. This could be becasue of the polariser I had on it, (would this be possible) or because its knackered.
There now seem to be three lenses as an option to consider: the Sigma, Tamron and Canon versions (my body is a Canon 350D). Is there any noticeable difference between the three if i accept they'll never be the best quality? I'm very tempted to stretch to a IS/ OS version, but for the extra £1-200 is it actually worth it?
Failing that if anyone knows of a nice L lens going cheap....(i wish).
Before you say that a 200mm lens is better, i find i tend to think I'd like more zoom rather than less.
Cheers!
There now seem to be three lenses as an option to consider: the Sigma, Tamron and Canon versions (my body is a Canon 350D). Is there any noticeable difference between the three if i accept they'll never be the best quality? I'm very tempted to stretch to a IS/ OS version, but for the extra £1-200 is it actually worth it?
Failing that if anyone knows of a nice L lens going cheap....(i wish).
Before you say that a 200mm lens is better, i find i tend to think I'd like more zoom rather than less.
Cheers!
Possible.
When a polariser is polarising you typically have to assume you will loose 2 stops and that is likely to be more critical at longer lengths when any available latitude in the focus system is probably compromised by less light - even though from your lens spec it seems to be fixed at f4.5 .
On the other hand I have also had a zoom lens that became very erratic at focus accuracy over 200mm. This was eventually rectified by a service.
You can test the Polariser theory by using it without the polariser. Be sure you can really tell if it is a focus issue rather than shake of some sort over 200mm.
And of course the points about Linear and Circular polarisers are valid too. Even with a Circ PL and a fast lens in good sunlight rapid AF can be a bit of a lottery so make sure you have allowed for lighting conditions when you compare.
On the other hand I have also had a zoom lens that became very erratic at focus accuracy over 200mm. This was eventually rectified by a service.
You can test the Polariser theory by using it without the polariser. Be sure you can really tell if it is a focus issue rather than shake of some sort over 200mm.
And of course the points about Linear and Circular polarisers are valid too. Even with a Circ PL and a fast lens in good sunlight rapid AF can be a bit of a lottery so make sure you have allowed for lighting conditions when you compare.
Mark IIs as well: http://www.ebay.co.uk/itm/Canon-EF-S-55-250mm-F4-5...
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