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9mm Field Stop Diameter 18
to provide the most engaging experiences with astronomy
the increase can be significant and not without performance consequences
The 40mm E-lux eyepiece's very low power is perfect for those times when you need all the light-gathering your telescope can offer to see faint deep-sky objects
Tele Vue 4x 2" Powermate Camera Tracker 9mm Field Stop Diameter 18Description With freedom from aberrations, greater magnification potential, and compact size, Powermates pick up from where Barlows can go no further. Al Nagler's 4 element concept, continues the tradition of full field sharpness with optimum aberration control. Like long eye relief? Retain the eye relief of long focal length eyepieces, while at high power. Enjoy, for example, the sharpness and comfort of the 32mm Plssl at up to 5 times the power!
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