minimum differences between a 85mm and 100mm lens?

[wahgongzai]

hi, I know this sound weired...

Can I assume that between a 28-85mm and 28-100mm lens. The differences is minimum since only 15mm more?

I did a search on google, lot of them are base on prime lens. Some say no differences and some say 100mm is better for portrait???

 

[zac08]

Well, for primes, I'd agree that there aren't much differences. But with a zoom as a upper limit, there may be some.

Generally, with most zooms, most would agree that a 3 x of the original factor would be the best, as such you can see most of the better zoom lenses are about there

17-35
28-70
70-200, etc... (at least these are for Nikon range)

So the more the zoom factor comes up to a higher level, it's generally known that there are certain quality aspects which may be compromised.

But this is a guide, go try it out yourself, you might not feel the difference on your usage aspect.

 

[wahgongzai]

So the more the zoom factor comes up to a higher level, it's generally known that there are certain quality aspects which may be compromised

thanks zac08!