N*K*N sells 2 element diopter close up "lenses" in several strengths (5T, 6T) all I believe are 58mm. The two element diopter is supposed to be superior (sharper images) than the single element. Haven't done any testing but I have used the N*K*N diopters for several years and have no complaints. Ken Waller ----- Original Message ----- From: Lon Williamson <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, December 04, 2002 9:18 AM Subject: Re: Question #2: Macro related
> I tried to buy the Sigmal 58mm 2-element about 6 months > ago and NOBODY had it in stock. I think it may have been > discontinued. > > I've got a 2-element diopter (came with the Phoenix 100mm > f3.5 Macro), and it works quite well. Many people think > that the 2-element diopters are the way to go: they certainly > take up less space than tubes or TCs. > > -Lon > > Boris Liberman wrote: > > > > Hi! > > > > Is it a good idea to buy macro filter set? There're two options - 58 > > mm for Sigma that can go to f/32 in 135 mm giving supposedly more DOF, > > or 49 mm for 50/1.7. I am leaning towards 49 mm because I hope to > > collect more Pentax primes that feature same filter thread. Or such > > thing is not worth the money anyway - poor optical quality... What do > > you say? > > > > Thanks in advance. > > > > --- > > Boris Liberman > > www.geocities.com/dunno57 > > www.photosig.com/viewuser.php?id=38625 > >
