Tele Vue 4x 2" Powermate Camera Tracker The 40mm E-lux eyepiece's very

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

"While Barlows are powerful tools

SKU S11220 UPC 050234112208 Optical Info Optical Design Newtonian Mirror Coatings 94% Aluminum Glass Type Borosilicate True Aperture (mm) 257 Primary Aperture (mm) 254 F/Ratio 4 Focal Length (mm) 1000 Secondary Diameter 89mm Secondary Obstruction (by diameter) 35% Secondary Obstruction by Area 12% Observational Info Dawes Limit 0

the increase can be significant and not without performance consequences

9mm Field Stop Diameter 18

Tele Vue 4x 2" Powermate Camera Tracker The 40mm E-lux eyepiece's veryDescription 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!