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Askar SQA70，70mm Aperture，F4.8，Quintuplet air-Spaced SD Glass Petzval astrograph，Astrophotography and Daily Photography，Telescope

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$1,665.00

$ 99 .00 $99.00

In Stock

About this item

  • Specifications: Aperture size: 70mm Focal length: 336mm Focal ratio: f/4.8 Objective lens: Quintuplet petzval APO (including two pieces of ED glass） Total length: 332mm (when the dew shield is contracted) 372mm (when the dew shield is stretched) Format specifications: Full-frame (44mm) OTA weight: 3.68kg (8.1lbs) Gross weight (including tube ring and dovetail plate): 9.9lbs Rear-end thread type: M42/M48/M54 adapters (M48 adapter is threaded for 2" filters) Rear-end connection distance: Supports 37-68mm range (recommended connection distance is 55mm)


High-quality quintuplet air-spaced ED glass Petzval Astrograph The 70mm aperture f/4.8 quintuplet air-spaced lens design offers a focal length of 336mm. The objective lens includes two elements of ED glass. The central star point has an RMS radius of less than 1.84 μm, and the star point at the corner is less than 2.4 μm. It also has excellent full-field illumination and MTF data. The integrated self-flattening Petzval design supports a 44mm full-frame image circle so there is no need for additional flatteners and no need to calculate back focus.


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