Dr Brian Warner..... Hmmmm I don't think Brian has a doctorate (yet).
There are some features in Canopus people probably aren't aware of like StarBGone. This actually subtracts unwanted stars from all images and is very reliable (down to 0.02mag precision dependant on the relative brightness of the subtracted star to the object being measured). I beleive he is also workign on varible shaper apertures to cater for trailed images (or trailed targets/comps depending on your method of image acquisition)
There is a Professor (Dr) Brian Warner, from South Africa and author of "Cataclysmic Variable Stars", the bible on the subject, and "High Speed Photometry" ... a world renowned and highly respected astronomer at the University of Cape Town ... but not the author of Canopus (by the american Brian D(ale) Warner of minor planet fame and author of "Lightcurve Photometry and Analysis").
The 'Canopus' Brian D. Warner, in his preface to the book just mentioned, states "I'm the other Brian Warner. The real Brian Warner is the famous and distinguished one...", which is why he uses the 'D' to differentiate himself.
To day I have received Wratten #21, #58 and #47 filters to try for photometry as my previous post. To my dismay they don’t fit in my Apogee Filter Wheel although they appear to have standard tread and fit in all camera adapters I got.
I had everything prepared to motorise this Filter Wheel, jut to drill mounting holes for the motor. What a bummer. Anyone knows how many different treads there are for 1 ¼ “ filters?
Karl,
As far as I know the standard 1.25" filter thread, if you can call it that is a 28.5mm thread.
Over the years I've found many problems (like you at the moment!) where filters will just not fit!!
All I can say is the Celestron, Meade, Schuler, Baader and many of the "filter extensions" and the x0.5 GSO reducer all seem to fit my TV plossls.
The problem is somewhere between the eyepiece manufacturer and the accuracy of the filter thread.
For filter wheels, all my filters fit the AtiK USB wheel but I did have problems earlier on with a manual filter wheel from the states, where very few, if any of my normal filters would fit.
BTW the thickness of the filters can also vary ( especially the Baader) and some filter wheels don't have enough internal clearance to allow them to operate.
Just my 2c
Well, yes short of spending $300 on some other Filter Wheel I will have to take camera out and screw new filter in the adapter. Not ideal solution as you never can put camera back at same position angle as before. If I can find very thin nuts with same tread as standard filters I would drill/machine offending tread out and fix the Wratten filters to the wheel. Never mind the original interference filters, I use them seldom. I don’t think it is possible to recut original tread, as the metal is only about 2mm thick. Well this is Astronomy – when you figure out what you want to do. things don’t fit.
