MoonFest Alton 21 March 2010

HantsAstro

Small Telescopes - Newtonian Reflector


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Optrons 150/1400 Reflector Telescope

100g butter
100g caster sugar
100g self raising flour 
Vanilla essence 
Pinch of salt
2 medium eggs

Sponge cake recipe cooking instructions:

1. Preheat oven to Gas mark 190°C

2. Mix above ingredients together.

3. Bake...

The Optrons 150/1400 Newtonian reflector is an example of a cheap Chinese telescope purchased from an auction site. Effectively it's a 700 mm tube with a 2X Barlow lens built into the focuser. Compared to the sky watcher EQ1 Mount, this example is particularly flimsy. However, after rebuilding the telescope and with proper collimation, it has now become a passable scope. However, some may find this type of 'device' off putting form the outset and requires a degree of understanding in order to get it to perform adequately, so as a beginners telescope it misses the point.

Compared to the Explorer 150, it gives one an idea of the difference in quality and usability, which is why we added it to our fleet.

Newtonians (also known as catoptrics) usually use a concave parabolic primary mirror to collect and focus incoming light onto a flat secondary (diagonal) mirror that in turn reflects the image out of an opening at the side of the main tube and into the eyepiece. The basic design has been around for hundreds of years and invented by, you guessed it Sir Isaac Newton in 1689.

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