Estimating relative distances for star clusters

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Estimating the relative distances of star clusters can be approached by measuring their angular size or apparent brightness. Geometric measurements of angular diameter may yield different results from photometric methods that rely on stellar brightness relations due to assumptions and corrections needed for interstellar reddening. If star clusters have similar physical sizes, angular diameter measurements are advantageous as they are less influenced by external factors. In contrast, brightness measurements require adjustments for absorption and re-emission effects in space. Ultimately, the choice of method can significantly impact the accuracy of distance estimations for star clusters.
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If star clusters were all about the same physics size, how could one estimate their relative distances?
 
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Either by measuring their angular size or apparent brightness.
 
would the distances determined geometrically give the same result as those determined photometrically (using stellar brightness relation)?
 
If they were really the same physical diameter then the advantage of measuring their angular diamter is that it isn't affected by anything else ( assuming it is large enough to be detected above atmospheric seeing)
The problem with measuring brightness is that you have to make assumptions and correct for the absorbtion and re-emmision from the space in between (Interstellar reddening).
 

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