Jupiter: Through the Telescope

Jupiter
A 100% crop of Jupiter taken with a Canon Powershot A95 mounted on a Newtonian style telescope.

If you are thinking about buying a telescope, please manage your expectations. I have a 5″ Newtonian Reflector scope which I picked up used for about $150. The image quality you can expect is marginal at best. Notice the bands on Jupiter? They are barely present. The storm is not visible whatsoever at this magnification. If you expect to see detail much greater than this, you could probably spend a bit more on a Dobsonian if you don’t mind the weight.

If astrophotography is your goal, I would recommend a refractor mounted to a Canon 60Da SLR body. This combo will run upwards of $2000 but should provide the best results.

Continue reading Jupiter: Through the Telescope

Arbitrary Value Rating Lookup Table

2012 Canadian Penny
The penny would get a low value rating as it costs more to produce than it is worth. In fact, Canada has now discontinued its production as of May 2012.

If you are looking for an easy way to compare values of a given subset I have created a simple lookup table for arbitrary value vs. rating. For example a $10 item scoring 10 points would have a value of 10 such that the rating is determined by squaring the item’s score divided by the price of the item. It is very useful for rating items in the range of $10-$100 and can be easily manipulated to represent the value of any range by factoring the value of the lowest priced item in the range to equal 10, such that for a range of $100-$1000 the price would be factored by 0.1 (100 x 0.1 = 10).

 

 

Here is the simple math:

10 = MIN_PRICE x FACTOR

VALUE = (RATING x RATING) / (MIN_PRICE x FACTOR)

Read on to see a sample lookup table. Continue reading Arbitrary Value Rating Lookup Table