Well, we have the same lens collection. The 250 was an accident, but a lucky one. There is a Rollei user, a fan even, who often turns up in web searches about everything Rollei 6000. He does sell parts of his collection on ebay from time to time. He had this 250 Sonnar on auction with a starting offer at around €205 and I was the only one bidding! That will not happen with the Hasselblad gear. It is a Mint condition lens as well.
The lens looks like the barrel of a cannon. I use it on occasion at is a joy when doing so. But in my backpack it takes as much space as two of the other lenses, so it's not part of the standard takeaway set.
When go out into nature hoping to find a few really nice spots I'm crazy enough to take the trilogy with me. 50, 80 and 150. Even though I often only end up using the 80 and perhaps once one of the others. Of course I need to have a 35mm Minolta with me as well, with one or two lenses. Three if I'm going to a really special place. Add the digicam, because you also need that for a quick post to friends. But I'm a huge Olympus fan there, so it hardly adds weight and m4/3 stuff is tiny.
Although the wide angle gets plenty of use I really love tele lenses. I figured out early that if you want to get nice pictures easily then just use a tele lens, point it anywere and push that strange button on the camera that makes a funny click sound. So the 150 is a must have.
When I want to use my small backpack I can fit the Rollei with the small 80mm lens in the top compartment that isn't supposed to be for camera equipment. Then I have to forgo the other lenses but I can still take some 35mm and/or digital stuff with me in the actual photo part of the bag.
About the battery. Yes it is an ordinary Li battery inside a Rollei housing. But I don't want to know what it looks like going through the x-ray machine. If they figure that is not a regular mass produced design, self approved by a manufacturer (CE and UL labels) then all bets are off. The people at the airport are not engineers, they cannot evaluate stuff and make a judgement. They work like a machine controled by a punch card, and any deviation from the plan might throw an exception. Otherwise how could you hire thousands of screeners world wide at bargain price salary with short training periods before they go live.
Of course I had it happen that they took great interest in my camera, shoes and other stuff, but didn't notice the carpet knife that I forgot inside my hand luggage... I only found it myself when unpacking.
