Originally posted by boodiespost so from all i've been reading between the two lenses here
- Tamron AF75-300mm F/4-5.6 LD
- Tamron AF70-300mm F/4-5.6 Di LD Macro
the Macro will have a shorter focus distance than the non macro lens correct?
well, not entirely ! some non-macro lenses can achieve a shorter focusing distance than pseudo-macros or even macros themselves, though they do not exhibit high magnification. the DA14 and DA15 for example can focus closer than the 50/100 macros and pseudo macro zooms.
macro capability of pseudo-macro lens would mean achieving a higher magnification ratio compared to ordinary lenses, but the magnification ratio ranges from 1:4 to as high as 1:2 only (unless a diopter lens is installed to further boost the magnification ratio from 1:4 - 4:1).
a real macro would have both close-focusing capability and a magnification of 1:1 ratio. and could increase the magnification further by adding a diopter lens and much higher than a pseudo macro.
*non-macro lens do not exhibit high magnification nor any significant magnification. pseudo macro zoom lens exhibit a substantially high magnification. macro lens exhibit the highest magnification. close focusing is a capability of a lens, but are not only limited to macros.