A number of friends of mine who do deep space astrophotography use DSLRs for this. The only thing they have to do when photo stacking is make sure they take lens cap on photos as well so as to allow … (View Post)

I just got a new phonerecently - the Galaxy S23 Ultra. These days I choose phones as much for the camera as the rest of it. In this case it has a 200 megapixel camera and I use it to its limits. Two … (View Post)

It would give them a headache - and they wouldn't be able to take asprin to relieve it :) (View Post)

Also Robert is in the US. So it depends on what exams his daughter is doing. Is calculus still part of the IB these days? (View Post)

It seems to change with the winds. I did calculus as part of my O levels back in the early 80s. Yet my son sitting his GCSEs right now has no calculus even in the higher papers. (View Post)