Oh wow thank you for that link. We have been trying to brainstorm ways to acclimatize, I am definitely going to rent that equipment.
I am aware of the oxygen levels at the pass and I have been stressing extra acclimatization days for me and my father (both of us are thalassemic) so we are planning 2-3 days at manang and we have extra days in hand in case we need to come back down.
I even went to consult my physician and got a blood work up done. There are thalassemic people that have summited k2 so it doesn't preclude us from doing the activity but precautions have to be taken. Interestingly enough we should generate more hemoglobin at altitude from all the research I have read. They say we need to spend 3 weeks at altitude to make our hb level rise.
So that link will help me immensely thank you so much for that.
I wanted to spend an extra night at high camp before thorung la pass but they recommend against people who are not acclimatized to sleep there, so I have read many conflicting reports as to what to do. They say it's better to climb and descend right away vs spending the night.
We are also carrying along oxygen.
You're welcome. I hope it's helpful.
An additional 2-3 days at Manang sounds like the right approach to me. However, most trekking agencies are strongly geared to the standard formula as porters are generally paid for carrying, not resting, and so the way to be sure of getting those additional rest days is to pay the porters fully via the agency for them as carry days and receive clear documentation of the variation, plus phone numbers of the manager in case the variation is not communicated clearly. Otherwise, you might have a situation in which porters insist early one morning that they are departing Manang as per the usual schedule.
Sounds unlikely, I know, but on my last trek a large group of porters decided that they'd sat around with us long enough at the base of the glaciated Amphu Labsta pass (5,845m) waiting for the weather to clear and took it upon themselves to leave camp with critical gear, before we were aware of it, which forced us to follow, hours later than we should have. The result was having to climb the ice serac cliffs and abseil the other side in what turned out to be treacherous conditions. Grrr.
Re thalassemic people summiting K2: Well, nobody summits K2 or Everest without hanging around at base camp for several weeks, from which they do shorter climbs to a few lower peaks or camps and return to rest up at base camp in order to gain proper acclimatisation. None of which you're doing. I expect that thalassemic people heading for the summit of K2 with your degree of impairment must be sucking on a reasonable continuous flow rate of bottled oxygen to negate the lower atmospheric pressure plus their impairment.
Yes, given the relatively rapid ascent on your trek itinerary, I agree that high camp below Thorang Pass is likely already too high to spend an additional night at, and it's better to climb the additional height to the pass and then descend quickly from there. The itinerary I linked to before shows the descent over the other side is rapid. I've been in two worrying situations where people developed clear signs of mountain sickness a day short of a high pass after making very gradual ascents, and the fastest way down was to continue the ascent with us another 600m or more to cross the pass, from which the descent was rapid. That approach worked both times, but it was worrying.
Regarding camera lenses, I recommend you consider taking only the lightest options. Everything will become much heavier.