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STS objective module

The STS 65 is a lightweight and handy spotting scope that offers high optical quality despite its compact dimensions. The straight view of the STS 80 is particularly beneficial to those who need to find moving targets quickly.

Effective objective lens diameter

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What to consider when choosing your spotting scope

Objective lens diameter

The objective lens diameter specifies how much light can enter the optics. This makes it a key factor in an instrument’s performance, for example, in twilight. The bigger the objective lens diameter, the more light the objective lens can capture. The darker the surroundings, the larger the objective lens diameter needs to be. Check the precise product name as the number after the ‘x’ specifies the objective lens diameter in millimeters. For example, a device with the suffix 10x42 has an objective lens with a diameter of 42 mm.

More Info
Product description

The straight view of the STS 80 is particularly beneficial to those who need to find moving targets quickly. The 80 mm objective lens diameter provides higher detail recognition, while a wider exit pupil ensures brighter images and comfortable viewing even in poor lighting conditions.

Technical specification

65 mm80 mm
Effective objective lens diameter
17 mm
Eye relief
9.8 ft16.4 ft
Shortest focusing distance
> 5 dpt
Diopter correction at ∞
2.6-1.3 mm3.3-1.1 mm3.2-1.6 mm4.0-1.3 mm
Exit pupil diameter
126-81 ft/1000 yds108-60 ft/1000 yds
Field of view m at 1000m / ft at 1,000yds
2.4-1.55 °2.1-1.1 °
Field of view degrees
2.4-1.55 °2.1-1.1 °
Field of view for eyeglass wearers in degrees
60-70 °40-65 °
Field of view apparent
85 %86 %
Light transmission of total product
750-1500 mm600-1800 mm
Focal length with TLS APO in mm.
M 67 x 0.75M 82 x 0.75
Objective filter thread
-13 to +131 °F
Functional temperature
-22 to +158 °F
Storage temperature
13 ft (4m) water depth (inert gas filling)
Submersion tightness
48.5 oz47.3 oz58 oz56.8 oz
Weight with straight view
14.8 in15.9 in
Length with straight view in mm.

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STS 80 without Okular ID 375699STS objective module
80Effective objective lens diameter
Price from $2,449.00
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