JKT f/8.06 wide field Cassegrain focus

• Focal plane position : Nominal 125 mm behind instrument rotator face (no A&G unit available). Adjustable from 45 mm to 206 mm.

• Field size : 90 arcmin field unvignetted, 93 arcmin with 50% vignetting.

• Image quality : At nominal focus, 0.5 arcsec on axis, 1 arcsec at edge of 90 arcmin field. With focal plane shifted by 50 mm, 1 arcsec on axis, 3 arcsec at edge of field.

• Image scale : 25.6 arcsec mm, 39 m arcsec.

The JKT f/8.06 focus is not normally offered to users, and requirement for this focus should be discussed well in advance with the JKT telescope manager.