Tip: Locating the lens cell adjustment screws of an ED-APO from Explore Scientific.

Product Description
Here you can see the adjustment screws for the lens cell of an ED-APO from Explore Scientific.

These screws are very easy to reach on this Explore Scientific model. This isn't always the case. Often, you have to remove the dew cap.

The adjustment is permanently adjustable, as the additional screw exerts additional pressure, making it harder for the screws to loosen. Usually, there is only one tension screw and one compression screw.