Your argument makes much sense. It is one of the reasons that I never replaced my Tamron 28-75/2.8 DI lens. Even though it is a good lens, the focal length range just doesn't fit me very well.
-- Best regards, Bruce Thursday, March 1, 2007, 9:15:37 AM, you wrote: JCOC> I guess I should elaborate a little on this lens (SMCK45-125/4)as some JCOC> others JCOC> are suggesting replacements that dont make sense in the context JCOC> of what I think the lens's best purpose. I dont believe you can JCOC> get high quality, reasonably fast, constant aperture zooms JCOC> that are going to cover the entire "old" standard range of 28-200mm JCOC> (35mm film format) with only one lens. The best way to do this JCOC> was to use TWO zooms, a short zoom in the 28-80mm range and a long zoom JCOC> in JCOC> the 80-200 range. Now with APS these numbers get shifted downward JCOC> so you would be looking at approx a 18-55mm lens and a 55-135mm lens. JCOC> The whole point of the subject post, the SMCK 45-125mm lens, is that JCOC> it can serve as the "long zoom" in a pair of high quality zooms JCOC> designed to cover most of the range you will need for most applications. JCOC> Combined with a good short zoom (like the DA16-45 for example), you JCOC> end up with much better quality than any 16-135mm lens would give if JCOC> even possible with constant aperture and low distortion. To me the JCOC> suggestions JCOC> of 28-200 lenses and 28-70 lenses for APS format make no sense in this JCOC> context because JCOC> they do not cover the APS "standard" range of 18-135mm that a pair of JCOC> good zooms can. JCOC> You would still need a wider lens for both a 28-200 and a 28-70 lenses JCOC> (when used on JCOC> APS) and in the case of the 28-70, you would need a longer lens too, JCOC> which JCOC> would mean you would need THREE lenses to cover the standard range of JCOC> 18-135mm JCOC> which is really too much and somewhat defeats one of the main purposes JCOC> of using zoom JCOC> lenes in the first place which is to minimize lens changes. So what I am JCOC> trying JCOC> to say here is that the SMCK45-125 can make for a really good LONG zoom JCOC> of JCOC> a pair of lenses when combined with a good SHORT zoom, like the 16-45 JCOC> etc., all on APS JCOC> format of course. JCOC> jco JCOC> -----Original Message----- JCOC> From: [EMAIL PROTECTED] JCOC> [mailto:[EMAIL PROTECTED] On Behalf Of JCOC> John Whittingham JCOC> Sent: Thursday, March 01, 2007 4:13 AM JCOC> To: Pentax-Discuss Mail List JCOC> Subject: Re: Alternative to the DA50-200/4-5.6 ? - Try the SMCK 45-125/4 JCOC> On Wed, 28 Feb 2007 18:55:34 -0500, J. C. O'Connell wrote >> I tried a SMCK 45-125/4.0 zoom for the >> first time today on my istDS. I really >> like the zoom range on APS, feels like a >> good ol' 70/80-200/210 on 35mm (actually its about 68-188 equiv). >> The 45mm focal length on the >> short end is very welcome( even wider would be nice) . I >> dont think I would like a 70-210 lens on APS, it's starting point >> is too long for a lot of situations... >> >> This particular lens is very sharp, contrasty, good saturation, no >> distortion visible at any focal length, and no CA. It's a constant >> aperture F4.0 to boot. I do not >> think I will be buying any slower 50-200/4-5.6 DA lens >> in the near future. >> >> heres a simple sample image : >> >> http://jchriso.com/temp/SMCK45-125SAMPLE01.jpg >> >> Next Batter up, the rare cult classic 60-120 ATX Tokina F2.8 lens, ( I >> know, 60mm is too long for a general purpose medium zoom, but this >> baby is constant F2.8, should still be good for portraits ).... >> >> laters, >> jco JCOC> John, JCOC> Looks quite impressive, better still, they fetch very little secondhand JCOC> so JCOC> there's bargains to be had........or there was! I'll be keeping the JCOC> Tamron 28- 75 XR Di indefinitely, great lens, bought from a list member. 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