Askar 65PHQ 65mm f/6.4 Quintuplet Flat-Field Astrograph
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- Flat Field Astrograph Telescope
- Ready for astrophotography out of the box
- Supports cameras as large as full frame
- 0.75x reducer available separately
Askar 65PHQ Demo Video
Askar 65PHQ Optical Design
The Askar 65PHQ is a flatfield astrograph telescope designed for astrophotography out of the box. With its five element 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. This optical 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 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.
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
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.
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
- Dew shield OD: 88mm / 3.46"
- 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
| Free Shipping Graphic | Free Contiguous US Shipping |
|---|---|
| Telescope Focal Length | 401 - 500mm |
| Hide Found a better Shipped Price on Frontend? | No |
- 65PHQ OTA
- Pair of tube rings
- Handle
- Askar 300mm Vixen dovetail plate
- A set of 3-piece photographic adapters
- Manual
- Flat Field Astrograph Telescope
- Ready for astrophotography out of the box
- Supports cameras as large as full frame
- 0.75x reducer available separately
Askar 65PHQ Demo Video
Askar 65PHQ Optical Design
The Askar 65PHQ is a flatfield astrograph telescope designed for astrophotography out of the box. With its five element 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. This optical 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 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.
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
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.
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
- Dew shield OD: 88mm / 3.46"
- 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
| Free Shipping Graphic | Free Contiguous US Shipping |
|---|---|
| Telescope Focal Length | 401 - 500mm |
| Hide Found a better Shipped Price on Frontend? | No |
- 65PHQ OTA
- Pair of tube rings
- Handle
- Askar 300mm Vixen dovetail plate
- A set of 3-piece photographic adapters
- Manual
Askar 65PHQ 65mm f/6.4 Quintuplet Flat-Field Astrograph # 65PHQ