The optical surfaces have a high value of {TAIL ~ elastic modulus}, reducing coma and other aberrations associated gravity and {HEAD ~ acceleration} 
The optical surfaces have a high value of { TAIL ~ elastic modulus } , reducing coma and other aberrations associated gravity and { HEAD ~ acceleration }
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD