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the increase can be significant and not without performance consequences
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
2" Big Barlow
to provide the most engaging experiences with astronomy
Tele Vue 4x 2" Powermate Camera Tracker the increase can be significantDescription 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!
US$ 65.00
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US$ 34.00
US$ 14.30
US$ 29.95
US$ 13.49
