It is a sunny day, can't waste such good weather. so we decide to do a comprehensive comparison of SV406P and SA401 APO many fans are concerned.
1. The sun viewing with SA401- interesting application
We cut a Badder film (density: 5.0) 100×100mm for solar observation, we DIYed a cap to suit the SA401 outer tube, and we use the flocking material to prevent stray light. (Don't observe the sun with the scope directly!!!)
The Sun image by SA401
2. Main features
|Name||SV406P ED||SA401 APO|
|Objective lens diameter||80mm||85mm|
|Objective lens group||3pieces/3group||4pieces/3group(double ED)|
|Objective lens focal length||430mm||450mm|
|Field of view||1.1-2.1°（60-108ft/1000yds)||1.14-2.2°（60-114ft@1000yds）|
|Prism||Porro BaK4||Porro K9|
|Near Focus Distance||5.5m||7.5m|
Demonstrating their outward difference in eyepiece, objective lens, focus system, tripod screw size.
3. Image comparison
What I can say is that they are both the high quality spotting scope. Without hesitation, SA401 is more excellent thanks to its APO and double ED glasses. In generall, SV406 is suitable for the medium and beginner user, and SA401 are more inclined to which has some experience in using a spotting scope.
Thanks for your watch.