Birding with spotting scopes
When you decide to buy a single piece of optical device for birding, Binoculars are the right choice for you. On the other hand when you spend considerable amount of time viewing such objects like the loons, waterfowl and gulls etc that are hard to follow without watching minutely, you may like some other specific device like the spotting scopes. When the objects are hard to penetrate, spotting scopes could be extremely useful for your purpose.
That is not all. Spotting scopes are found to be very useful while attached to the digital camera or any other optical viewing equipment so that you can obtain the close up photograph of distant birds. The spotting scope looks like a miniscule telescope but the similarity ends there. The magnification in these spotting scopes is much lower than the telescopes and ranges from 15x to 60x on average. Another difference is that while you can use the spotting scope in lieu of the telescope, say for viewing the starts, you cannot use the telescope for the purposes for which spotting scopes are used, like viewing birds.
The difference therefore lies in the light gathering capabilities of the scopes just as in case of the rifle scopes. Yet when it comes to the requirement of both binoculars and spotting scopes you should better opt for good binoculars instead of investing your money on dual devices. However if you can afford both within your budget, the combination would be one of the best you can hope for.