Please Note:
- All Sharpstar/Askar refractors undergo physical, mechanical and optical QC inspections at the factory, and an inspection checklist is included with each telescope.
- We may partially open the scope boxes to ensure that the scope has been inspected/certified by the manufacturer but we do not open the scope and inspect it again.
- However, if you would like us to perform a mechanical and cosmetic inspection of your telescope again before we ship it, just request this in the comments field when you place your order. We will be happy to do this at no extra cost for this scope, but this will delay your shipment by 1-2 business days. Note that we are unable to perform optical tests/inspections.
Quick Overview
- Flat Field Astrograph Telescope
- Ready for astrophotography out of the box
- Forgiving Petzval design is easy for beginners
- Supports cameras as large as full frame
- 0.75x reducer available separately
- Limited edition pink version also available while supplies last
Askar 65PHQ Petzval Design
The Askar 65PHQ is a flatfield astrograph telescope designed for astrophotography out of the box. With its Petzval optical design, this telescope is fully corrected and provides a flat field capable of covering full frame sensors all without the need for an additional flattener. The Petzval design also allows you to connect a camera, filter wheel or filter drawer, and other accessories without having to worry about back focus.
Building on the success of the PHQ series, the 65PHQ is the smallest telescope in the line, which includes the 80PHQ, 107PHQ, 130PHQ, and 151PHQ models. All PHQ telescopes feature a Petzval design with two ED elements to eliminate chromatic aberration. Unlike other telescopes in the PHQ line, the 65PHQ uses a quintuplet (5-element) APO lens arrangement instead of the quadruplet design found on the other telescopes.
Spot Diagram for the Askar 65PHQ showing its ability to support full frame cameras
The Askar 65PHQ is a flatfield astrograph telescope designed for astrophotography out of the box. With its Petzval optical design, this telescope is fully corrected and provides a flat field capable of covering full frame sensors all without the need for an additional flattener. The Petzval design also allows you to connect a camera, filter wheel or filter drawer, and other accessories without having to worry about back focus.
Building on the success of the PHQ series, the 65PHQ is the smallest telescope in the line, which includes the 80PHQ, 107PHQ, 130PHQ, and 151PHQ models. All PHQ telescopes feature a Petzval design with two ED elements to eliminate chromatic aberration. Unlike other telescopes in the PHQ line, the 65PHQ uses a quintuplet (5-element) APO lens arrangement instead of the quadruplet design found on the other telescopes.
Spot Diagram for the Askar 65PHQ showing its ability to support full frame cameras
Askar 65PHQ Focal Length and Aperture
The 65PHQ features a focal length of 416mm and an aperture of 65mm, which results in a focal ratio of f/6.4. For those who want an even wider field of view and faster focal ratio, the optional Askar 0.75x Full Frame Reducer for the 65PHQ is also available for purchase separately. This reducer gives the 65PHQ a focal length of 312mm and a new focal ratio of a fast f/4.8, which is perfect for wide field imaging. Note that when using the reducer, you must use a standard back focus of 55mm.
The 65PHQ features a focal length of 416mm and an aperture of 65mm, which results in a focal ratio of f/6.4. For those who want an even wider field of view and faster focal ratio, the optional Askar 0.75x Full Frame Reducer for the 65PHQ is also available for purchase separately. This reducer gives the 65PHQ a focal length of 312mm and a new focal ratio of a fast f/4.8, which is perfect for wide field imaging. Note that when using the reducer, you must use a standard back focus of 55mm.
Askar 65PHQ Focuser and Adapters
The 65PHQ features a large 2.5" rack and pinion focuser that is directly compatible with the ZWO EAF without the need for additional adapters. In front of the focuser is a 360-degree rotator for easily dialing in the framing of your deep sky object or imaging target. It also features three different threaded connections for connecting a camera or accessories: M48, M54, and M68. The M48 adapter features a female thread inside for attaching 2" filters if the user does not have a filter drawer. Each of the three different sized adapters thread on to each other have a different length of available focus:
- 76mm (from the base of M48x0.75 male thread)
- 105mm (from the base of M54x0.75 male thread)
- 130mm (from the base of M68x1 male thread)
Rack and pinion focuser found on the Askar 65PHQ
The 65PHQ features a large 2.5" rack and pinion focuser that is directly compatible with the ZWO EAF without the need for additional adapters. In front of the focuser is a 360-degree rotator for easily dialing in the framing of your deep sky object or imaging target. It also features three different threaded connections for connecting a camera or accessories: M48, M54, and M68. The M48 adapter features a female thread inside for attaching 2" filters if the user does not have a filter drawer. Each of the three different sized adapters thread on to each other have a different length of available focus:
- 76mm (from the base of M48x0.75 male thread)
- 105mm (from the base of M54x0.75 male thread)
- 130mm (from the base of M68x1 male thread)
Rack and pinion focuser found on the Askar 65PHQ
Askar 65PHQ Visual Observation & Other Features
Unlike some Petzval telescopes, the Askar 65PHQ has the ability to be used visually as well when paired with a diagonal and an eyepiece (sold separately).
The 65PHQ comes with a retractable dew shield, a 300mm (12 inch) dovetail plate, tube rings, a handle, the three camera adapters, and finally a manual. The OTA itself weighs a lightweight 2kg (4.4 lbs), is CNC machined, and sports a green color scheme. A limited edition pink version is also available in limited quantities.
Unlike some Petzval telescopes, the Askar 65PHQ has the ability to be used visually as well when paired with a diagonal and an eyepiece (sold separately).
The 65PHQ comes with a retractable dew shield, a 300mm (12 inch) dovetail plate, tube rings, a handle, the three camera adapters, and finally a manual. The OTA itself weighs a lightweight 2kg (4.4 lbs), is CNC machined, and sports a green color scheme. A limited edition pink version is also available in limited quantities.
Askar 65PHQ Technical Specifications
- Aperture size: 65mm
- Focal length: 416mm
- Focal ratio: f/6.4
- Objective lens: Quintuplet air-spaced APO (including two ED glasses)
- Image circle: 44mm
- Maximum accessory connection (with the focuser fully retreated):
- 1. Imaging mode:
- 76mm (from the base of M48x0.75 male thread)
- 105mm (from the base of M54x0.75 male thread)
- 130mm (from the base of M68x1 male thread)
- 2. Observing mode:
- 121mm (from the end of 2" eyepiece holder)
- Total length:
- 328mm (including 1.25" eyepiece holder as dew shield contracted)
- 388mm (including 1.25" eyepiece holder as dew shield fully stretched)
- 360mm (including the 3-piece adapter as dew shield contracted)
- 420mm (including the 3-piece adapter as dew shield fully stretched)
- Net weight: 2kg
- Gross weight: 2.8kg
- Rear-end thread type:
- M68x1-M54x0.75
- M54x0.75-M54x0.75
- M54x0.75-M48x0.75 (M48x0.75 filter thread inside)
- Rear end of the 3-piece photographic adapters: M48x0.75
- Aperture size: 65mm
- Focal length: 416mm
- Focal ratio: f/6.4
- Objective lens: Quintuplet air-spaced APO (including two ED glasses)
- Image circle: 44mm
- Maximum accessory connection (with the focuser fully retreated):
- 1. Imaging mode:
- 76mm (from the base of M48x0.75 male thread)
- 105mm (from the base of M54x0.75 male thread)
- 130mm (from the base of M68x1 male thread)
- 2. Observing mode:
- 121mm (from the end of 2" eyepiece holder)
- Total length:
- 328mm (including 1.25" eyepiece holder as dew shield contracted)
- 388mm (including 1.25" eyepiece holder as dew shield fully stretched)
- 360mm (including the 3-piece adapter as dew shield contracted)
- 420mm (including the 3-piece adapter as dew shield fully stretched)
- Net weight: 2kg
- Gross weight: 2.8kg
- Rear-end thread type:
- M68x1-M54x0.75
- M54x0.75-M54x0.75
- M54x0.75-M48x0.75 (M48x0.75 filter thread inside)
- Rear end of the 3-piece photographic adapters: M48x0.75
What's in the Box
- 65PHQ OTA
- Pair of tube rings
- Handle
- Askar 300mm Vixen dovetail plate
- A set of 3-piece photographic adapters
- Manual
- 65PHQ OTA
- Pair of tube rings
- Handle
- Askar 300mm Vixen dovetail plate
- A set of 3-piece photographic adapters
- Manual