Pros and Cons

Double-image micrometers have some distinct advantages:

- less danger of systematic errors compared with filar micrometers;

- work well with imperfect clock drives;

- for close pairs the distance measurements are easier than with a filar micrometer;

- for close pairs - distance about 2'.'0 and less - with a magnitude difference of not more than 1.5 magnitudes the distance measurements (double-distances, stars on a straight line) are more accurate than with a filar micrometer.

On the other hand the disadvantages are:

- less brightness of the images (loss of about 0.75 magnitudes);

- limitation to relatively close pairs;

- the important parameter e/F (Lyot micrometer) is not easy to achieve.

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