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Modular ATX / STX spotting scopes from SWAROVSKI OPTIK

Benefits of modular design

You can switch between an angled and straight view. For instance, the straight view is predominantly used (STX 85) for digiscoping, but you may prefer the angled view for normal observation. In this case, you can quickly and easily switch between them using the modular system.

You can switch between different objective lens diameters. What is the purpose of this? When observing wildlife at twilight, you can use the 95-mm objective module to gain, for instance, that crucial 20 minutes of observation time. On the other hand, you will definitely find the 65-mm module adequate during normal daylight, and it is lighter to carry.

The 95-mm objective module enables you to achieve the maximum (70x) magnification (65-mm and 85-mm modules provide maximum magnification of 60x). In this case again, if light conditions permit, you can switch to the 85-mm or 65-mm module, which is lighter to carry.

If you are traveling about and want to save loads of space, the 65-mm module is ideal. You can dismantle it to keep the pack size (and weight) to a minimum, but without scrimping on optical quality.

You can also expand your modular system further retrospectively.

Differences in resolution between various objective lens diameters

The resolving power test target shown below shall indicate the difference of resolving power of a 65mm / 85mm / 95mm lens module.
Resolution is defined as a threshold measurement. The resolution limit is the last group of bars that can be seen and correctly counted in both horizontal and vertical directions. The resolution limit of an optical system (= spotting scope) is found by examining an image of the resolution test target to locate the element of highest frequency where horizontal and vertical lines are still distinct.