Table of Contents
SV406P VS SA401
It is a sunny day, can't waste such good weather. So we decide to do a comprehensive comparison of SV406P and SA401 apo spotting scope.This is also a topic of concern for many birdwatching enthusiasts.
The Sun Viewing with SA401
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.
Comparison of Main Features
| Name | SV406P ED | SA401 APO |
| Magnification | 20-60 | 20-60 |
| Objective lens diameter | 80mm | 85mm |
| Objective lens group | 3pieces/3group | 4pieces/3group(double ED) |
| Coating | FMC | Super FMC |
| Eyepiece diameter | 24mm | 24mm |
| Objective lens focal length | 430mm | 450mm |
| Eye relief | 18-20mm | 18-20mm |
| Exit pupil | 1.33-4mm | 1.4-4.3mm |
| Field of view | 1.1-2.1°（60-108ft/1000yds) | 1.14-2.2°（60-114ft@1000yds） |
| Prism | Porro BaK4 | Porro K9 |
| Net weight | 1625g | 2192g |
| Near Focus Distance | 5.5m | 7.5m |
| Water Proof | IPX6 | IPX7 |
Demonstrating their outward difference in eyepiece, objective lens, focus system, tripod screw size.
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.
Comments (2 )
Григорий
Make a scope D100mm, 20-60, APO, FL 550mm, Porro Bak4, 2500g, ... 1.25 that could work with most eyepieces, extenders and barlows.
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katana