Imaging-system back focus set by Tele Vue adapters
Corrected field
Flat imaging field
Mechanical
Focuser
Imaging System focuser
Astrophotography Fit
Best for wide-to-mid-field nebulae and general deep-sky imaging when the mount, camera format, and correction hardware are chosen as one system.
Tele Vue NP101is sits in the telescope slot for wide-to-mid-field nebulae and general deep-sky imaging. The useful headline specs are aperture 101 mm, focal length 540 mm, f/5.4.
Camera coverage: Full frame / APS-C / Micro 4/3. Image circle: 52 mm. Back focus: Imaging-system back focus set by Tele Vue adapters.
Refractors keep the field routine calmer: no regular collimation, predictable cooldown, and a clean path to autofocus and filtered imaging. The tradeoff is aperture and reach.
Best paired with
Corrected field flattener or reducer when the design requires one
Cooled APS-C or smaller astro cameras matched to the image circle
Autofocus, guide scope or OAG, and a mount with comfortable payload margin
Not recommended for
Large full-frame sensors unless the corrected field supports them
Very small travel mounts near their realistic imaging payload limit
Buyers expecting one telescope to be ideal for every target size
Where To Buy
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