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33 posts
Most people will be nice to others unless it’s in their interest not to be, but if it is, there are no limits to how nasty they can get. Remember that psychos are often charming, and good company. You can only get away with being totally amoral if people tend […]
The measurement of time is a fascinating subject, Superficially simple and commonplace, it develops more and more complexity the more you look into it. In learning what I needed to know to design a sundial, I found myself delving into the subject and often frustrated that the information I needed […]
LX 90 weight The telescope assembly weighs approx 14.5 kg with no eyepieces etc. The tripod is approx 8kg. Wedge 4.5kg. The exact weight you have to lug around depends of course on what is attached…. LX 90 focussing The LX90 focusser works by moving the mirror. Turning the focusser […]
The focuser on the ETX70 works by moving the objective along the barrel. Turning the focuser clockwise shortens the barrel and moves the objective closer to the eyepieces. So if you move the focuser clockwise, and then pull an eyepiece out of the holder, you will regain focus. Because closer […]
The camera adapter has a t2 male thread at the top (wide end) which screws into the adapter for the camera. It has a t2 female thread at the bottom which screws into a t2 mount. An eyepiece goes into the barrel at the bottom ( from the inside ) […]
Broadly speaking, I subscribe to the argument that as an amateur, you should care primarily about using a telescope you look into rather than as a way of capturing images on a computer. That doesn’t mean I’m not interested in astrophotography, but nothing quite beats the visceral impact of seeing […]
Autostar End of 505 connector cable — rj10 (the smaller “Handset” size) +-----------+ 1- Data TO Autostar Black | 1 2 3 4 | 2- Data FROM Autostar Red +---+ +---+ 3- not used Green |___| 4- ground Yellow Hole in Autostar Other end of cable 1- Astar Rcv: data […]
For some reason, there have always been some aspects of Quantum Mechanics which I’ve found it hard to get to grips with, not for the usual reasons ( weirdness, macroscopic superposition &c), but simply because some of the basic mathematical consequences of the framework are neither obvious nor typically explored […]
An awful lot of confusing stuff is written about quantum measurement, decoherence, bell’s theorem, etc. etc. I don’t have any answers, but I do at least want to capture the right questions. What are the issues and non-issues We all know that quantum systems behave differently from classical ones. We […]