- 50mm aperture; SV198 is convenient for astronomers to find a target in the sky; a large diameter can obtain a good view
- 6 points guide ring; easy to adjust the guide scope and astronomical tube; especially important for entry level astronomy enthusiasts
- Optical glass; multi layer broadband anti reflection coating double glue lens; well made edge coating
- Double spiral fine focusing and pull out coarse focusing structure; fine focusing; simple structure and convenient operation
- One scope for multiple purposes; can be used as a guide star and star finder; 1.25 inches zenith lens can be installed for visual star finder by removing a section of the lens barrel; and the reserved light path is used for the zenith lens and eyepiece
The review blog: https://www.svbony.com/blog?s=SV198
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A very versatile guidescope
I received this little guider and was amazed by how versatile it is! It can be a finder (by pluggin in a 90º prism and eyepiece) and a guider. The build quality is excepcional, all metal. The lens have a very nice antireflex coating and there is a baffle inside for cutting down stray light. The equipment arrived in Brazil in perfect conditions, the packaging is made of some kind of foam, with cutouts for the dovetail, rings, guider and screws. The plastic pointed screws are a nice touch, so it will not scratch the guider tube. The images are very crisp and I had no problems in guiding my 8" GSO RC at 1610mm of focal distance with this guider. I can recommend it.
| Model | SV198 |
| Type of Optics | Achromat Refractor |
| Lens Structure | 2-Elements/ 1Groups |
| Tube material | Aluminum |
| Aperture | 50mm / 1.97in |
| Focal ratio | f/4.1 |
| Focal Length | 206.6mm / 8.13in |
| Coating | Fully multi-coated |
| Blackened Lens Edges | Yes |
| Focuser | Dual Helical + Telescopic Design |
| Dual Helical Focuser Focusing stroke | 11mm |
| Focusing seat accuracy (Dual Helical Focusing) | 0.1mm |
| Rough Focusing stroke | 38mm |
| Focusing seat accuracy (Rough Focusing) | 1mm |
| Connection thread to Eyepiece | 1.25" and T2 |
| Base installation type | Vixen standard interface |
| Tube diameter | 55.5mm |
| Dew cap diameter | 58mm |
| Total Length | 223mm |
| Net Weight | 770g / 28.1oz |
The Parameter Comparison of SV198、 SV106and SV165
| Model | SV198 | SV106 | SV165 |
| Type of Optics | Achromat Refractor | Achromat Refractor | achromatic optics |
| Lens Structure | 2-Elements/ 1Groups | ||
| Tube material | Aluminum | Aluminum Alloy | Aluminum |
| Aperture | 50mm / 1.97in | 60mm / 2.36in | 30mm/1.18in |
| Focal ratio | f/4.1 | f/4 | f/4 |
| Focal Length | 206.6mm / 8.13in | 240mm /9.45in | 120mm |
| Coating | Fully multi-coated | Fully multi-coated | Fully multi-coated |
| Blackened Lens Edges | Yes | Yes | |
| Focuser | Dual Helical + Telescopic Design | Helical Focuser with 8 mm Travel | Helical Focuser |
| Connection thread to Eyepiece | 1.25" and T2 | 1.25inch | 1.25in and M42*0.75 |
| Base installation type | Vixen standard interface | Versatile | Vixen standard interface |
| Tube diameter | 55.5mm | 66mm | 45mm |
| Dew cap diameter | 58mm | 69mm | 48mm |
| Total Length | 223mm | 270mm | 112mm |
| Net Weight | 770g | 790g | 342g |
| Back Focal Length | - | 220mm | - |
The SV198 50mm aperture guide scope with a built-in dual helical focuser is known for its versatility, let alone the lightweight. Together, all of those make SV198 a perfect tool for guiding, searching, and spotting. The full multi-coated achromat glass brings excellent optical performance, makes it great for both sharpness and color. BTW, it also could be used as a right-angle correct-image optical finder scope (Eyepieces and Prism Diagonal sold separately).
The package includes:
- SV198 50mm f/4.1 mini Guide Scope
- Two-Ring bracket with a dovetail
- 6PCS Nylon-tipped thumbscrews
- 25" Dust Cover
- Lens Cover
Applicable Accessories
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