Guys,just out of curiosity while researching in net for compact camera advices this questions i found this ques in my mind for DSLR camera.Just simple answer will be fine. 1.Which is best DSLR camera in the world in terms of performance.such in gpu GTX 690 or ATI 7990. 2.is it possible to use one brands lens in another brand dslr camera? 3.what is Most widest,zommiest lens is found in market for dslr camera's?
You can use pretty much any brand of lens with mount adapter for any camera body, but you will lose the ability to focus and possibly aperture control (aperture maybe control manually if the lens is not an electric aperture control), and some lens may not work at all due to rear element hamper the mirror mechanism.
One camera body is best suit for certain photographer, but it may not suit others.
Landscape and architecture photographers enjoy medium or large format film cameras because it let them control perspective with high resolution and high colour saturation, while sport photographers prefer accurate and fast auto focus that generally associate with FF, APS-H and APS-C cameras. And, others may enjoy the convenience of having smaller formats because they are more portable.
That said, any top of the line camera today will be obsolete and will be beaten by inexpensive future bodies that cost 1/10 of the price in 5-10 years. While lenses will still be usable in 10+ years, while some lenses will be more than capable in 30+ years.
My Canon EF 50mm f/1.8 from 1987 still perform perfectly well on my 5DmkII, and it still is quite sharp by today standard.
There are lenses from all manufacture that are 50+ years old, and some as old as 70-80 years old are very capable when use with mount adapters.
