Askar FRA300 Pro (60mm f/5 Quintuplet Petzval Astrograph)
FRA300 Pro--the smallest 60mm F/5 Petzval astrograph with the fastest native focal ratio in the FRA series so far,it's focal length is 300mm.
The star is sharp and delicate. At the center of its field of view, the RMS radius can reach 2um. Even a serious user can also be satisfied when it comes to the shape of stars.
Specifications
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FRA300PRO |
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Aperture |
60mm |
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|
Focal length |
300mm |
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|
Focal ratio |
f/5 |
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|
Objective type |
Quintuplet fully air-spaced Petzval APO (including one ED glass) |
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|
Image circle |
44mm full-frame |
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|
Maximum accessory connection (with the focuser fully retreated)： |
1. Imaging mode: |
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|
Total length： |
303mm |
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|
Net weight： |
2.26kg |
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|
Gross weight： |
3.12kg |
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|
Rear-end thread ： |
M48*0.75 male thread |
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Standard package items： |
a tube ring, a handle, an Askar 300mm Vixen dovetail plate, a M42*0.75 adapters, a warranty，a manual |
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Original: $1,169.62
-70%$1,169.62
$350.89
Description
FRA300 Pro--the smallest 60mm F/5 Petzval astrograph with the fastest native focal ratio in the FRA series so far,it's focal length is 300mm.
The star is sharp and delicate. At the center of its field of view, the RMS radius can reach 2um. Even a serious user can also be satisfied when it comes to the shape of stars.
Specifications
|
FRA300PRO |
||
|
Aperture |
60mm |
|
|
Focal length |
300mm |
|
|
Focal ratio |
f/5 |
|
|
Objective type |
Quintuplet fully air-spaced Petzval APO (including one ED glass) |
|
|
Image circle |
44mm full-frame |
|
|
Maximum accessory connection (with the focuser fully retreated)： |
1. Imaging mode: |
|
|
Total length： |
303mm |
|
|
Net weight： |
2.26kg |
|
|
Gross weight： |
3.12kg |
|
|
Rear-end thread ： |
M48*0.75 male thread |
|
|
Standard package items： |
a tube ring, a handle, an Askar 300mm Vixen dovetail plate, a M42*0.75 adapters, a warranty，a manual |
|
