Askar 65PHQ 65 mm F/6.4 quintuplet astrograph
Askar 65PHQ 65 mm F/6.4 quintuplet astrograph
Askar 65PHQ 65 mm F/6.4 quintuplet astrograph
65PHQ is a flatfield astrograph newly launched after 80PHQ, 107PHQ, and 130PHQ. Instead of buying extra flatteners, calculating the back focus of the flattener, or making a tedious connection to match the correct distance, astrophotographers can simply equip it with any possible imaging accessories, make the target stay at the focus, and then the whole optical system is perfect for imaging.
65PHQ has a smaller size than other PHQ astrographs. 65PHQ has a focal ratio of f/6.4 and a focal length of 416mm. Instead of the quadruplet structure of other PHQs, the 65PHQ is a quintuplet with two ED glasses which offers excellent control of chromatic and other aberrations. With its self-flattening design, 65PHQ offers strong advantages in the astronomical shooting. It supports the full-frame image circle and has a fine spot diagram with tiny distortions of the peripheral stars.
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65PHQ Parameters |
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Aperture size |
65mm |
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Focal length |
416mm |
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Focal ratio |
f/6.4 |
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Objective lens |
Quintuplet air-spaced APO (including two ED glasses) |
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Image circle |
44mm |
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Maximum accessory connection (with the focuser fully retreated)： |
Imaging mode 76mm（from the base of M48×0.75 male thread） 105mm（from the base of M54×0.75 male thread） 130mm（from the base of M68×1 male thread） |
Observing mode 121mm（from the end of 2" eyepiece holder） |
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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） |
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OTA Weight |
2kg |
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Total Weight (Including tube ring&dovetail plate） |
2.8kg |
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Rear-end thread type |
M68×1-M54×0.75 M54×0.75-M54×0.75 M54×0.75-M48×0.75 (M48×0.75 filter thread inside) |
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Rear end of the 3-piece photographic adapters |
M48×0.75 |
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Standard package items |
A 65PHQ OTA, a pair of tube rings, a handle, Askar 300mm Vixen-style dovetail plate, a set of 3-piece photographic adapters, a manual |
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| Product Status | New |
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| Package width | 20 cm |
| Package height | 26 cm |
| Package depth | 39 cm |
| No. of parcels | 1 |
