TAKAHASHI 100mm F7.7 Teegul Dillworth Relay &mount
这个Teegul光学有点意思哦。。。
The secondary mirror is coated on the 2nd surface for double pass,
focus is between the primary and secondary and image is then corrected
by several lenses in the primary baffle tube. The image is therefore erect
with a very small secondary diameter increasing contrast. These were typically
meant for terrestrial use with much greater aperture and resolution,
and much less color error than typical refractor spotters. The image quality
is therefore not as good at high powers as say the Mewlons but work excellently
over spotting scope magnifications
90年代生产100mm 150mm and 300mm 口径
无参考价
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