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The SV198 50mm aperture guide scope with a built-in dual helical focuser is known for its versatility, and 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 colour. BTW, it also could be used as a right-angle correct-image optical finder scope (Eyepieces and Prism Diagonal sold separately).
Features
- 50mm aperture; large diameter objective lens collects more light; the target in the field of view is clearer; convenient to find a target in the sky
- Connect telescope camera; as a guide scope can be used with other accessories to easily achieve automatic star guidance
- Connect Eyepiece; as a right-angle correct-image optical finder scope (Eyepieces and Prism Diagonal sold separately)
- Fully multi-coated glass; multi layer broadband anti reflection coating double glue lens; well made edge coating; higher contrast and clearer field of view
- Fine focusing; double spiral fine focusing and pull out coarse focusing structure; simple structure and convenient operation
What's Included?
- SV198 50mm f/4.1 mini Guide Scope
- Two-Ring bracket with a dovetail
- 6PCS Nylon-tipped thumbscrews
- 25" Dust Cover
- Lens Cover
Specifications
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 SV19SV106and 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 |
- |