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ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.

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  1. postcardcv

    Sigma Lenses

    I've used DG and non-DG lenses on my Canon DSLRs and have noticed not difference. The only difference (as I understand it) is tha the DG lenses have a different coasting on the rear element, not worth the extra money to my mind.
  2. postcardcv

    Sigma Lenses

    I'm with Paul on this - I have seen numerous test that show that filters can degrade image quality (seen it on one of my own lenses). If you are going to buy a filter you need to mae it a top quality one and even then there has been suggestions that it will still have a negative effect in IQ.
  3. postcardcv

    Sigma Lenses

    I've got to disagree with this, I've been down the compact, digiscoping, superzoom route and now use dslr - there really is no comparison in quality. Yes a dslr system will cost more and be more weight to carry round with you, but for the improvement in image quality I feel it's more than worth...
  4. postcardcv

    Sigma Lenses

    I'd agree with Paul that if there is not a difference in AF speed on your camera that there is not much advantage to the 50-500. I used the 170-500 for some time and never found the short end to be too long. The 170-500 is considerably lighter than the 50-500 which makes handholding it much easier.
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