Originally posted by pearsaab take a gopro
Very sensible advice. Even in large two-seaters there's not much space inside a cockpit, so operating a DSLR might be problematic.Most likely you will be flying in the front seat*, and most (if not all) gliders have a small opening (a sort of window) in the canopy for ventilation purposes. Its size is sufficient for gopro, even on a stick**, or medium sized lens without hood. Forget about long tele lens as there's simply not enough room to operate it. If you purchased longer (thermal) flight you can ask your pilot if you can get close ('close' means between 100 and 200 m) to another glider - this is safe and pretty common situation in thermal flights, an may offer a very nice photo opportunity. If your flight is going to be on aerodrome traffic circle, you have several minutes at relatively low altitude (300 - 500 m above ground level) to take pictures. Ideally, you should purchase two flights
one to enjoy the ride, and another one to take pictures
As per focal length, I would go with 20 or 14 mm, 31mm may make sense for objects on the ground during flights at lower altitude, like during flights in aerodrome traffic circle. As others wrote, operating a polarizing filter is usually very problematic (albeit feasible), besides this sky gets slightly darker when you gain altitude. Last, but not least, if you plan any aerobatics, holding a gear in hand will present extra challenge
*) I have not seen even single flight with adult passenger in a rear seat. However, it may happen if the passenger is very light, as two-seater gliders require a minimal mass in the front cockpit. Depending on a glider, minimal mass of a person in front cockpit might be like 50 or 60 kg,
**) glider's speeds are relatively low, for cruising and thermals they are usually between 80 - 90 kph, so you can safely stick out a gopro if you wish (but please do not open the canopy
.