3.5m-telescope on Calar Alto

* undersized secondary


corrector		prime-system		RC-system	IR-system
corrector		2 lens	3 lens	RC-system	IR-system
aperture	mm	3 500
focal length	mm	12 195	13 761	35 000	157 500
central obscuration	mm ø	820		1367	281.66
eff. coll. area	m²	9.093		8.153	8.969*
f/ratio		1/3.48	1/3.93	1/10.0	1/45
FOV	mm	100	243	300	109
	arcmin	28.19	60.71	29.47	2.38
scale	"/mm	16.9	15.0	5.89	1.31
radius of field curvature	mm	infinite		-3786
hourangle range	h	-7 to +7

Image of the 3.5m-telescope (399 kByte)

Cut through 3.5m-building (17 kByte)