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Cassegrain calculator '; ST += '

General parameters for ' + vType[sRBtype - 1] + '

'; ST += ''; ST += ''; ST += ''; ST += ''; ST += ''; ST += ''; ST += ''; ST += ''; ST += ''; ST += ''; ST += ''; ST += ''; ST += '
Primary mirror diameter' + fncTrimFP( D1, 4) + un + '
Primary mirror focal length' + fncTrimFP( F1, 4) + un + '
System focal length' + fncTrimFP( F, 4) + un + '
Back focal length' + fncTrimFP( B, 4) + un + '
Distance secondary from system focus' + fncTrimFP( v, 4) + un + '
Distance secondary from prime focus' + fncTrimFP( p, 4) + un + '
Distance secondary from primary' + fncTrimFP( l, 4) + un + '
Radius of curvature of secondary mirror' + fncTrimFP( R2, 4) + un + '
Primary mirror conic constant' + fncTrimFP( C1, 4) + '
Secondary mirror conic constant' + fncTrimFP( C2, 4) + '
Extension factor' + fncTrimFP( ef, 4) + '
' ST += '

Schwarzschild coeficients

'; ST += ''; ST += ''; ST += ''; ST += ''; ST += ''; ST += ''; ST += ''; ST += ''; ST += ''; ST += ''; ST += ''; ST += ''; ST += ''; ST += ''; ST += ''; ST += ''; ST += ''; ST += '
Coma' + fncTrimFP( Coma, 4) + '
Astigmatism' + fncTrimFP( Ast, 4) + '
Petzval Curvature' + fncTrimFP( PetzCur, 4) + '
Curvature of field' + fncTrimFP( FC, 4) + un + '
Coma' + fncTrimFP( ComaArc, 4) + sArcSecods + '
Astigmatism' + fncTrimFP( AstA, 4) + sArcSecods + '
Radius of field curvature' + fncTrimFP( RF, 4) + un + '
   (curvature is '; ST += (RF <= 0) ? "toward" : "from"; ST += ' sky)
Axial diameter of the secondary' + fncTrimFP( Ax2, 4) + un + '
Optical diameter for field' + fncTrimFP( w, 4) + un + '
Epsilon 0.707 of:
   Primary' + fncTrimFP( fncExponent( EP1 ), 4) + un + '
   Secondary' + fncTrimFP( fncExponent( EP2 ), 4) + un + '
Slope at edge of:
   Primary' + fncTrimFP( fncExponent( SL1 ), 4) + un + '
   Secondary' + fncTrimFP( fncExponent( SL2 ), 4) + un + '
'; ST += ''; ST += ''; parent.Output.document.write(ST); parent.Output.document.close(); } function fncTrimFP( fNum, iDP) { var iIndexOfDP, iIndexOfExp, sExp; fNum = fNum + ""; iIndexOfExp = fNum.indexOf("e") if (iIndexOfExp == -1) { sExp = ""; } else { sExp = fNum.substring(iIndexOfExp, fNum.length); } if ( fNum.indexOf(".")==-1 ) { fNum += "."; } fNum += "0000000000000000000000000"; iIndexOfDP = fNum.indexOf("."); return fNum.substring(0,iIndexOfDP + 1 + iDP) + sExp; } //-->

Cassegrain telescope calculator

This program calculates construction parameters for cassegrain telescopes

Choose units: mm inch
Choose type: Classical Cassegrain
Dall-Kirkham
Ritchey-Chrétien
Pressmann-Camichel
Stigmatic combination
Primary mirror diameter:
Enter field: (deg)
Primary mirror focal length:
System focal length:
Back focal length:
Distance secondary from system focus:
Distance secondary from prime focus:
Radius of curvature of secondary mirror:
Primary mirror conic constant:
Secondary mirror conic constant:
 
     

 

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