About this product
High-quality 2" 4-element Photo-Visual Coma Corrector
Designed and manufactured by Guan Sheng Optical (GSO) in Taiwan.
Reduces coma and field curvature.
Designed for fast Newtonian telescopes with focal ratios f/3-f/6 but optimised for around f/4.
This modular design includes a 2" eyepiece holder with two large thumbscrews and a non-marring brass compression ring (won't mark your eyepiece barrels).
For astrophotography, the eyepiece holder can be removed to reveal an M48 thread for connecting a camera and includes an M48-M42/T2 adapter.
Increases magnification slightly (approximately 1.1x) and has a back focus requirement of approx 75mm. So, for example, when using a Canon/Nikon DSLR camera with 55mm back focus (including a standard thickness M48 ring to fit the camera), you will need an approx 20mm long spacer between the corrector and M48 ring.
- Smooth 2" nosepiece with M48x0.75 / 2" filter thread
- Designed for f/4 Newtonian Telescopes but works well around f/3-f/6
- Fully multi-coated 4-element, 2-group optics
- Reduced coma and field curvature
- 1.1x Magnification
- 75mm ± 5mm back focus
- 44mm clear aperture
- Includes an M48 to M42/T2 Adapter
- Undo the 2" eyepiece holder to reveal an M48 thread
What's in the box
- 2" Coma Corrector
- M48 to M42/T2 Adapter
- Lens Caps
|Barrel Size ||2" / 50.8mm |
|Magnification ||1.1x |
|Focal Ratio ||f/3-f/6 |
|Optics ||Fully multicoated. 4-elements, 2-groups |
|Weight ||335g complete |
220g without 2" eyepiece holder
|Clear Aperture ||44mm |
|Back Focus ||75mm ± 5mm |
|Filter Thread ||M48 x 0.75 / 2" filter thread |
|Camera Thread || |
M48 x 0.75 with 2" eyepiece holder removed
M42/T2 with included M48-M42 adapter
|Country of Manufacture ||Taiwan |
|Average Rating (1 Review): |StellaLyra 2" 4-element Photo-Visual Coma Corrector
03 April 2023 | GUY
Blown away with the effect this coma corrector has on my favourite Maxvision 24mm 82degree eyepiece through my 12” f/4.9 dob; it simply cleans up the coma and tightens up the stars perfectly; I used 1 x 12mm & 1 x 7mm extension ring making 19 total, I can't see myself using the Morpheus 17.5 without it, as switched from the 24mm Maxvision back to the Morpheus 17.5 and found it to need that last 5% improved. After my focuser upgrade, this is the best addition to my Dobsonian; very impressed.
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