I normally shoot hand held or with a bean bag, but recently I've been toying with the idea of learning to shoot with my lens+body attached to a tripod. I recently tried it on my current tripod, but found with the weight of the D7100+Tamron 150-600, that the collar felt flimsy. I use this tripod for filming and with smaller lens, such as the 35mm or 50mm and it does the job very well. So I'm looking at investing in a new tripod for my Tamron 150-600 and my newly bought second hand Nikon AF-S f/4 300mm. I would say my budget is around £100. Thanks!