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about_mosaic_fov_settings [2008/11/06 15:03] (current)
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 +==About Mosaic FOV settings:==
 + 2 deg,54 min x 1 deg,34mins is 174 arcmins x 94 arcmins
 +
 +The field of view needed is that of your imaging device when applied ​ to your scope. Obviously there are a wide range of FOVs we need to cover when you consider the various options folks have in terms of  scopes, barlows, reducers, CCDs, webcams, DSLRs, SLRs etc. You don't have to be deadly accurate with setting the FOV values just err on the '​smaller'​ side and all that will happen is the mosaic ​ will be slightly more overlapped.
 +
 +For an imaging device at prime focus the FOV dimensions may be calculated as follows:
 +
 +<code vb>
 + FOV (arcmins) =   3.438 * ChipDimension / FocalLength ​
 +</​code>​
 +Where ChipDimension and FocalLength are in mm. FocalLength should take into account magnification effect of any barlows/​reducers in the imaging setup. ​
 +
 +Note that the mosaic program assumes your imaging device'​s FOV is aligned in RA and DEC - so movement in RA moves stars horizontally across the image - adjusting the frame overlap should ​ compensate for small errors in alignment.
  
/home/welshdra/public_html/eqmod/data/pages/about_mosaic_fov_settings.txt ยท Last modified: 2008/11/06 15:03 (external edit)
 
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