I use Nikon D90 with Nikkor 70-300G VR lens. I have been looking for some options for a longer reach and internet seems to be filled with Sigma 150-500 OS and Sigma 50-500 OS versions as recommended budget tele-zooms. Now there is one more from Nikkor, 80-400 f4.5/5.6. I almost settled my mind on 150-500OS version as it complements my 70-300VR better.
Now one of my Facebook photographer friend, who swears by Photozone.de, strongly recommended Tamron 200-500 Di version. I read the photozone review of this lens and it seems to be alright, more so if I stop down the lens to f8. I tried to find whether there is any comparative test between Siggy 150-500OS and Tammy 200-500 SP Di version, but there is none from reputed sites.
So may I ask the opinion of the members here about which lens would give me better IQ (150-500OS or 200-500 SP Di)? Is there any comparative test between these two lenses?
Please understand that I shall not be able to afford higher primes which are simply out of my reach.