Sigma 170-500
I have been using the Sigma 170-500 for approx. 4 years on a Pentax MZ7 & MZ6 with excellent results. I just bought a Pentax istDS2 and the Sigma is fantastic. I took all my lenses to the store before I bought the DS2 to try them and even the staff were impressed with the quality of the images.
When I bought mine new I paid around $1000 CDN and $150 CDN for a circular polarizer. Filter size (from memory) is 86mm.
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"Your first observations of birds and their behaviour can be done by simply learning to drift gently through a wood: a naturalist in a hurry never learns anything of value." - by Gerald Durrell
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