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Explore 90 SAP
The Sky Rover 90SAP is a purpose-built 90 mm f/5 Petzval astrograph designed for medium-format astrophotography. Its air-spaced quintuplet optics produce a native flat field across a large 55 mm image circle, letting you build a simpler imaging train without adding a separate field flattener.
Fast 90 mm f/5 Petzval optical system
Native flat field 55 mm image circle
3.3" dual-speed rack-and-pinion focuser
Built-in tilt and rotation adjustment
Rigid CNC tube with rings, handle, and Vixen plate
A 90 mm aperture and 450 mm focal length at f/5 give a wide, fast imaging platform well suited to large nebulae and rich star fields. The speed helps reduce exposure times while the Petzval design aims to deliver strong edge-to-edge correction across the usable field.
The 90SAP’s air-spaced quintuplet Petzval layout is specified to provide a naturally flat focal plane and a 55 mm image circle. That reduces the need for a separate field flattener and simplifies back-focus calculations when building an imaging train.
A 3.3-inch dual-speed rack-and-pinion focuser gives fine control when framing and focusing, with 38 mm of effective travel to accommodate a range of camera bodies and adapters. This helps with precise focus and managing different sensor stack heights.
The OTA ships with tube rings, a Vixen-style dovetail plate, a multi-function handle and dual finder bases, so you have the mounting hardware to start assembling an imaging rig. The CNC tube and included accessories aim to provide a rigid, repeatable platform for cameras and guiding gear.
No. The 90SAP is designed with a native flat field using an air-spaced quintuplet Petzval design and a 55 mm image circle, so a separate field flattener is not required for the intended medium-format imaging area.
The 90SAP has a focal length of 450 mm and a focal ratio of f/5.
The telescope provides a 55 mm image circle, with pinpoint star performance stated within a 44 mm area of that overall circle.
It uses a 3.3-inch dual-speed rack-and-pinion focuser with 38 mm of effective travel.
The package includes the Sky Rover 90SAP OTA, tube rings, a Vixen-style dovetail plate, a multi-function handle, dual finder bases, and a soft carry bag.
No. The 90SAP is designed as a dedicated imaging telescope and is not intended for use with visual accessories such as diagonal mirrors.
Camera interfaces listed are M63x1, M54x0.75 and M48x0.75.
With the dew shield contracted the length is 443 mm, extended it is 566 mm. The OTA weight is 4.5 kg and gross weight with tube ring and dovetail is 5.5 kg.
| Aperture | 90 mm |
| Focal Length | 450 mm |
| Focal Ratio | f/5 |
| Optical Design | Air-spaced quintuplet Petzval APO |
| Image Circle | 55 mm |
| Total Length (dew shield contracted) | 443 mm |
| Total Length (dew shield extended) | 566 mm |
| OTA Weight | 4.5 kg |
| Gross Weight (with tube ring & dovetail) | 5.5 kg |
| Focuser | 3.3" dual-speed rack-and-pinion focuser |
| Focuser Travel | 38 mm effective travel |
| Camera Interface | M63x1 / M54x0.75 / M48x0.75 |
| Optics | Includes dual SD glass, one ED element, and HR glass |