Docter Basic 2.5-10x50 rifle scope is very versatile and all-round usable rifle scope, best suited for all of those hunting in the mountains, stalking and for those who need a bright scope for low light use. Docter Basic scope series is optically equal to much praised Docter Unipoint line of scopes, but it has different illumination control. Illumination system in Docter Basic 2.5-10x50 has an intensity range from very dim low light setting and all the way up for day-bright use. It is controlled very instinctively with a rotating button (Docter Shiftcontrol) and also has the automatic turn off function after 3 hours. Functioning of the Docter Basic reticle illumination system is explained in this VIDEO and you can see the illumination intensity graph below. Illuminated dot can be fine-tuned to any possible light conditions so that over-illumination or under-illumination can never happen.
Reticle design is really unique in Docter Basic scopes since the illuminated dot in located in the second focal plane - SFP and the reticle bars in first focal plane - FFP. Such reticle offers great rapid target acquisition at low magnifications due to this reticle bars and clearly visible illuminated dot. It also offers very fine dot on the target on high magnification settings for accurate aiming. With unrivaled optical resolution for this price class (2.5 second of arc according to measurements in Article: 56mm Lichtriesen, DJZ 12/2010) and very high light transmission rate seen on the lower picture, this scope is a great choice for many who search premium optics for affordable price.

Docter Basic 2.5-10x50 dimension can be found HERE.
To mount Docter Basic 2.5-10x50 scope on a rifle a pair of 30 mm mounting rings is needed.