Since I did not know before quite how exactly does it all I'll explain it this short. If someone is so exactly ...
I like to take pictures of flowers with the 75-300mm. For this I turn it all out on 300mm and Scan from a few steps away (so close I can just ran and still get sharp). This I get a sharp flower and all about quite blurred.
With the lens on it I turn the lens clean every whit on 75mm and put myself right in front of the flower. Through the lens the distance is quite short. Should we then try when it is sharp. Thus, the bloom is then enlarged and a smaller cut for all matter is sharp even fuzzier.
That is until now my experience. The images are not all that because a small wobbler has a lot more impact, but I got pretty interesting pictures for me.
The bag that you get to it, I think not necessarily optimal. Although each lens has its own compartment, but that is covered by a network. I would imagine that one there ever risking a scratch. I screwed all the lenses at the moment together and packed between sheets in a Tupperware container. The is also stronger than the pocket. Everyone needs to decide how he does it.
All professional photographers who get upset and anyway never in my life such a "cheap" lenses would use on my language / terms, now need not even any Comments Post. I make private photos and wants to make nice pictures for me and do not know all the technical terms and that's it.