Originally posted by marc121 Yeah ok I thing I get it ahah! No one has told me if the Bigma is sharper than the 55-300 at 300mm focal length
The Bigma has good IQ at 300mm.
In general any zoom will probably be at its best when not pushed to the limit of focal range.
I have experience with a newer version of the Bigma and it is very good in its mid ranges, and requires more care and attention when shooting longest ranges to get sharp shots.
Like others I would say if you can swing it and it is in decent shape, get the Bigma if only to try it and later sell it if you find it is too heavy or not to your expectation of IQ.
I expect you will shoot it at longer than 300 if out in the country.
A monopod helps with the handling.