whyseeyellow
New Member
Why most major brand only make 60mm and 100mm micro.
Thanks in advance.
Just my point of view: most macro lenses i see is around 50/60, 90/100 or 180/200. That's around two times increment of focal length. If the difference in increase in magnification (factor in min. focusing distance here) is insignificant, there's no need to upgrade from a 50mm to a say, 75mm. It'll make more sense to go for a 100mm instead.
As for why the min. focal length is around 50mm could be because it's not cost effective to make 1. If there's a 25mm macro, wouldn't the min. focusing range have to be very short? This increases the cost of the lens as more complex parts and designs have to be used.
Hope this explain your doubt =)