Je ne comprends pas vos critiques concernant cette longue vue, elle est étanche et prévue pour observer en extérieur.
Extrait de la notice.
The GrandView ED Spotting scopes are waterproof, and can be used in inclement weather. However, this does not mean they can be left outside
when not in use, and they are not rated for submersion in water.
If it is raining, it’s best to use the spotters inside their case for added protection, but the body itself will protect against rain.
Also note that the spotters are waterproof only when using the included zoom eyepiece, and may not be waterproof if a different eyepiece is used that is not rated for wet conditions.
Please bring the spotting scopes back inside when not in use, and always store indoors.