Having been following the various threads on the new Sigma 120-300mm OS for the last few months (great site by the way, I'm amazed I've not stumbled across it before now), I took the plunge and sold my Canon 100-400mm and replaced it with the new Sigma 120-300mm OS. The thing is a beast, especially compared to the 100-400mm it replaced. Almost double the weight! Still hand holdable for aviation photography which is my main hobby.
Now that its arrived, it's also time to consider a new bag and whether a Lens strap will be required.
I currently have the Lowepro Mini Trekker which happily held my Canon 100-400mm, Canon 70-200mm F4 and several other odds and ends. The Sigma 120-300mm OS and my 7D just about fit in together however it is a bit of a tight squeeze and hence would like a slightly larger bag allowing more room and possibly allow the camera, lens, and a 1.4x extender to fit in snugly when all connected.
I was just wondering is any current Sigma 120-300mm owners have any advice? I'm currently looking at the Lowepro Flipside 400AW (or possibly the 500AW) as possible upgrades. It would be nice to have a bag which would hold the lens and camera together whilst also being small enough to use as hand luggage onboard aircraft. The 500AW is probably slightly to big to fit underneath an aircraft seat though.
Another issue that has arisen with this new 3kg beast of a lens is the use of a carry strap. My previous Canon 100-400mm and 7D were just fine with the basic camera straps, however now with the heavier lens, I feel it's time to begin using a shoulder sling strap connected to the Sigma's tripod mount.
Is there any recommended shoulder slings used by current photographers with larger lenses? The Black Rapids RS-7 seems a common choice however it's a bit pricey and the thought of using a little D ring connector with the tripod mount sounds a little risky as it means the entire weight of the camera and lens is held purely on the threads of the D ring.
Assuming the D ring connector is strong enough to hold the 4kg of lens and camera, then this seems pretty similar to the Black Rapids RS-7;
Would this be suitable for carrying the Sigma 120-300mm OS around for a while?
Lastly, any other tips for carryig or using the Sigma 120-300mm? As I'll be doing mostly aviation photography, I will not be using a monopod or tripod, as I can usually just set the lens into the backpack between aircraft movements if it gets a bit too heavy to hold.