- 50mm aperture; SV198 is convenient for astronomers to find a target in the sky; a large diameter can obtain a good view;
- Position clamp screw; 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;
- Precise helical focusing with a millimeter scale and 12mm focal path;
- One scope for multiple purposes; can be used as a guide star and star finder;
- 45mm T2-Extension Tube Male thread M42*0.75; Female thread M42*0.75; eliminates a range of focusing problems;Tube rings with Vixen compatible dovetail.
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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 | 12mm |
| 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 | 234mm |
| Net Weight | 577g |
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 | 234mm | 270mm | 112mm |
| Net Weight | 577g | 790g | 342g |
| Back Focal Length | 25.54mm | 220mm | - |
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Feature
- 1. The SV98 50mm small telescope is primarily intended as a guide scope for autoguiding. But it can also be used as a viewfinder or mini telescope.
- 2. Focusing is done using a precise helical focuser with a millimeter scale and 12mm focus path.
- 3. 1.25" eyepiece holder with T2 thread.
- 4. Position clamp screw.
- 5. Tube rings with Vixen compatible dovetail.
- 6. The 45mm T2-Extension Tube Male thread M42*0.75; Female thread M42*0.75; eliminates a range of focusing problems.
Package includes
- SV198 50mm f/4.1 mini Guide Scope
- Bracket with a dovetail
- 3PCS Nylon-tipped thumbscrews
- 45mm T2-Extension Tube
- 1.25" Dust Plug
- Lens Dust Cap
Applicable Accessories
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