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

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  1. D

    Lightweight lens

    OK smarty pants , I failed my maths O level ( aged 15 years) twice before I eventually passed.:-C:-C:-C No offence intended of course!!!!
  2. D

    Lightweight lens

    You have got me there,I don't know for sure! The way I see it is if you now have 400mm it's 25% more than the 300mm you had before but you may well be right. Either way it's not to be sneezed at! cheers Dave
  3. D

    Lightweight lens

    I have never owned any of the 70-300 series but in terms of IQ I doubt there will be any difference whatsoever between the three non DO ones.I know nothing of DO lenses either. Lens improvements are more likely to be faster focussing, lighter weight or image stabilisation improvements all are...
  4. D

    Lightweight lens

    I posted the thread on size matters to give a visual idea of reach but in simple terms and in your case of the 70-300 vs 100-400 the latter has a very significant 25% extra reach and a very significant 20% better minimum focus distance if you fancy chancing your arm at a bit of macro...
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