Compact yet capable, the SQA70 Quint APO Petzval Telescope from Askar has a quintuplet air-spaced apochromatic lens system that eliminates the need to use a separate field flattener.
The quint APO has two extra-low dispersion elements and dramatically reduces chromatic aberration. The air-spaced Petzval design eliminates the need for a field flattener or to calculate back focus, as long as your connection distance is between 37 and 68mm.
The fast f/4.8 focal ratio and 336mm focal length lend themselves to deep-sky photography, but the SQA70 can also be used as a long lens for daytime mirrorless or DSLR photography.
Optical Tube Assembly
- f/4.8 focal ratio allows for wide-field deep-sky photography with efficient exposure times
- Quintuplet air-spaced apochromatic refractor design with two ED elements produces rich views with minimal chromatic aberration
- APO is self-flattening, eliminating the need for a separate field flattener
- Supports 44mm image circle for full-frame cameras
- Fine spot diagram with tiny distortion of peripheral stars and <1.84µ central RMS radius
Focuser
- Sturdy 2.5" rack-and-pinion design supports photo trains and is compatible with automatic focusers
- 360° rotator with scales and two finder bases
Use and Handling
- M68, M54, and M48 camera adapters
- Two integrated tube rings, hollow for light weight
- Handle has a multifunctional base for a finder or other accessory
- Rings have threaded M4 and M6 holes for accessories
- Retractable dew shield