Sigma 150-600mm Lens

[BuckSkin]

This post by caspa prompted my question:

photoshopelementsandmore.com/post/90013

I do have the latest version of the Sigma 50-500mm and two +2 or 2X or whatever tele-extenders/tele-converters.

I really like the 50-500mm, especially the fact that I can back it down to 50mm if the need arises; it is very quick to focus; and, if I do my part, images are tack sharp.

However, I would like to add the 150-600mm to my arsenal.

caspa made mention that his lens is a G1; how many generations are there and what differs from generation to generation ?

I understand there are also two versions, Contemporary and Sport; does each generation of the Contemporary have a counterpart in the Sport version; or, are the generation changes of the two versions independent to one another ?

About the time I learn that Sigma has a new lens, they have already discontinued it and dropped it from the books.
 

[pontiac1940]

Sorry BuckSkin no help here. No experience with Sigma telephotos. Owners like them.

[caspa]

Sorry Buckskin.

I had a major senior's moment in that post :-(

I actually have a Tamron 150 - 600mm G1 lens and not the Sigma equivalent.

My Sigma lens is actually the 17 - 70mm.

Sorry about the confusion :-(

[caspa]

Generally speaking, telephoto lenses and a large focal length range will result in less sharpness than a prime lens. For normal use it's not an issue.

But both the Tamron and Sigma 150-600mm are pretty much equal in image quality from the reviews I have read.

But I look at it this way. Why would lens manufacturers make a 600mm prime if its image quality/sharpness was the same as their 150-600mm at 600mm

Basically, the more glass the light has to pass through the lens then the higher the chance of reduction in image quality.