Tele Vue NP101is - Manual (Page 8)

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2. Prime focus with 0.8X Reducer for APS and smaller size
chips in cameras with 55mm chip to T-Ring distance.
4. Prime focus with 35mm format SLRs in cameras with 55mm
chip to T-Ring distance.
1. Prime focus for APS and smaller size chips in cameras with
55mm chip to T-Ring distance.
3. Prime focus with SBIG STL series cameras