The 13MM Nagler Type-6 is truly amazing. When used with either my TV-76 or TV-101, stars are pinpoint sharp to the edge, with a remarkable spacewalk field of view, and extremely high contrast. No false color on Venus or the Moon. 12MM eye relief is very comfortable for either day or night use, and no detectable blackouts or kidney beans. The design is very compact and lightweight too. This may be the best Nagler ever for general use with fast APO refractors. A real must have eyepiece, the 13MM Type-6 is just right in a way that has to be seen to be fully appreciated.