Because In my experience, PENTAX Non-IF tele lenses do not perform as well when used at close up ranges less than the designed-in minimum focus distance. If you use a high quality closeup lens you are actually changing the optical design. This results in better optical performance than simple ext. tube can deliver. In fact, some of pentax's early zooms came with matched high quality closeup lenses for closeup use rather than just extending the helicoid further. BUT, of course, you need to use a very high quality closeup lens for best results. JCO
> -----Original Message----- > From: Paul Stenquist [mailto:[EMAIL PROTECTED]] > Sent: Saturday, September 21, 2002 5:29 PM > To: [EMAIL PROTECTED] > Subject: Re: SMCT 135/2.5 UPDATE/source for closeup lenses???? > > > Why not use the short extension tube? That should give you good portrait > focusing distance. > Paul > > Dan Scott wrote: > > > > On Saturday, September 21, 2002, at 05:51 AM, J. C. O'Connell wrote: > > > > > > Anyone know of a webstore that sells high > > > quality closeup lenses at good prices? > > > What are the best brands? Are they all single > > > element designs or are some doublets? > > > I want to buy a 67mm size +1 closeup lens for > > > my 200mm F4 SMCT for P6X7 to use for portraits. > > > > > > JCO > > > > > > > JCO, >
