My camera bag is always too heavy... well, not the bag itself... When I need to use an SLR instead of my beloved M6 I use this: - a Canon EOS 1v with a Powerbooster E2 (yes, I will sell off the PB) - 4/24-105 IS (the classic 3 lens combo in one lens, acceptable quality, but not really great), 670 gramm - 2.8/70-200 IS (good lens, but way too heavy, and covering 70-105mm twice is just nonsense), 1,470 gramm - 1.4x Extender (I find the results with the 70-200 barely acceptable), 220 gramm In fact, I like longer focal lenghts a lot, that's why I have two Novoflex follow-focus lenses. - One is the old one-grip version with a 280mm and 400mm head, - the other is a more modern two-grip version with a 400mm and 560mm Telyt head. I would use them much more often if these beasts wouldn't require a heavy tripod, adding to the overall weight. The lenses themselves are actually lighter than Canon's costly white lenses, but of course they have no stabilizer, which is a really nice feature for telephotos. There is a Canon 100-400 lens. It has approximately the same weight as my 70-200, it has a very useful range, and I could stop using the Novoflexes. If it would yield better results I would buy it, but I tried it and was not impressed. Using that one with an extender results in images that are not at the quality level I would accept. There is also an 80-400 Sigma lens with a stabilizer, but results are also not very impressive, it's even heavier, and people report about a very slow and noisy autofocus. So, I thought about primes... the 2.8/200 is not bad, but expensive and has no stabilizer. Using it with an extender is at the same level as my 70-200, e.g. only useful in emergency cases. The 4/70-200 is slightly better and much lighter, but with the extender... no way. Next idea: get rid of the 70-200 and go for a 4/300, the only of the white IS telephoto lenses that would not turn me into a poor man. It's reasonably sharp, even with a 1.4x extender, but it's an older lens - the IS is a 1st generation IS, AF is not very fast, and it leaves a big gap between 105 and 300mm. It weighs 1120 gramm. As you see, I trapped myself in some ideas about gear and how to get rid of some weight without sacrificing some focal lengths. What would you do except saying "get rid of all, get a 4x5" or "what is an EOS"?