Finally managed to buy a used len 70-300mm, 35mm equivalent focus len to 140-600mm super-tele zoom. Also this len works sharp on 70-150 and anything above that will be a little soft focusing. The len construct with 14 elements in 10 groups incorporates three ED lens elements to offer sharper. 
With this len, I will try out shooting Natural wildlife on birds and insects and animals. I have post a picture that compare with my 40-150mm, so much difference with focus lenghts.
This recent len 70-300mm is a bit hard to shoot with handheld, best is to use tripod inorder to get sharp pictures.
Another picture lens of 14-45mm + 40-150mm + 70-300mm.
Hope that I can managed with this new lens of mine and will show some photos
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