Digital BW, The Print

Also, all new Sigma lenses (those from the last number of years) all work with the current DSLRs.  I have 3 Sigma lenses, the 15-30, 20 and 15FE.  The rest of my lenses are all Canons except for a Tamron 90 macro (and its the older one)---but most people are finding that Sigmas do just fine on Canon DSLRs--except for pretty old ones.  All Canon lenses are compatible with all DSLRs and the only lenses I've heard of giving problems are old Sigmas but quite a few people have had them rechipped--except for some very old ones I guess.  

Diane
  ----- Original Message ----- 
  From: Tom Moore 
  To: DigitalBlackandWhiteThePrint@yahoogroups.com 
  Sent: Tuesday, April 26, 2005 11:12 AM
  Subject: RE: [Digital BW] www.OpenRAW.org needs your help or is it the other way around


  Paul

  That condition appears to be quite common with Sigma lenses. I believe some
  other third party manufacturers (such as Tamron) license technology from
  Canon to make their compatible lenses and it may not happen with those
  lenses. I think Sigma must reverse engineer Canon cameras to design their
  Canon lens interfaces.

  For newer Sigma lenses (I don't have any and haven't done this personally) I
  understand that they can be returned to Sigma for a firmware upgrade which
  can make them compatible with newer cameras.

  So, it's not really Canon's choice in the matter. I guess they could charge
  less for the lens interface technology.

  Tom



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