Quote:
Originally Posted by ozark1
Maksutov,
Granted dust will reduce and scatter - but so what if you lose 10% of the light, 0.1-0.2 mags is not worth getting worked up about.
|
That's an interesting transformation. Now, having built reflectors from scratch since 1961, I can see the difference, both in brightness and resolution, in the image of a clean optics scope versus a dirty one.
Quote:
Originally Posted by ozark1
The owner of a beginner level instrument should not be encouraged to start taking it apart.
|
Why not? It's a good way to learn about the pluses and minuses of scope construction. As well as the basics re telescope optics. The "beginner" might realize "Hey, I could do a better job myself!" and get into telescope making, a fine pursuit that has led many into a career in astronomy.
Quote:
Originally Posted by ozark1
The Dawes limit is not a useful concept for a backyard telescope - theoretically a 130 mm mirror could split 0.9", now find one that does.
|
Got one right here. Made it myself.
Quote:
Originally Posted by ozark1
On the subject of aluminium - IUPAC recognises Humphrey Davy's third attempt to name the element with recognition that the ACS has differed since 1925. Personally why "alumium" never caught on I'll never know... (H Davy's first name for the stuff)
|
In the US it's aluminum. Quite elementary.
