Alan Sheppard

Cleaning Corrector SCT on the Scope

Rating: 2 votes, 5.00 average.
by , 12-30-2012 at 12:14 AM (1956 Views)
A corrector will not keep its pristine appearance if used and we have to live with that fact.

There are several different methods that are suggested on searches such as Windex, ASO etc, but I find that the method below does a good job.

Before any cleaning takes place, make sure that the surface of the corrector has been blown off with an air bulb, not compressed air that may leave contaminates. Then carefully lift off other debris using a soft lens brush from a camera store such as Lenspen-SensorKlear.

Making a solution:

Use Isopropyl Alcohol (not RUBBING ALCOHOL) and distilled water.

Mix the solution by Using 50% distilled water with 50% of Isopropyl alcohol at 90% strength, making about one liter that will be more than plenty. Add a drop of liquid dish soap (Dawn) to the mix. This solution is to be used on the corrector only and not on any mirrors.

Use good quality Kleenex tissues to use as wipes. Surgical grade cotton can be used, but I find the Kleenex drys the surface of the corrector much better.

Cleaning on the scope:

Have the corrector pointing downwards, so that the cleaning solution does not find its way to the back of the corrector or in the tube. Have the tube somewhere slightly below the level mark, don't make it too hard on yourself!

Fold the Kleenex tissue twice and wet it with the solution. Even though the corrector is at a slight downward angle, use the tissue in a flat manner, laying it against the corrector and pulling it along the glass as follows:

Start the application towards the middle of the corrector (from the secondary housing) and drag the tissue straight to the outer edge. The tissue will hug the corrector because it is wet.

As a result of this, you will see that the corrector become wet as well. As the tissue is drawn across the surface, the cleaning solution will quickly be evaporating behind it, due to the presence of the alcohol. This will leave this portion of the corrector clean and dry. Continue this same procedure until you go 360º around the corrector with overlapping passes.

Make sure that the tissues are changed many times during this procedure so that any dirt/dust that is picked on any pass is not re-deposited on the corrector! If needed, another 360º pass can be completed.

This should be all that is needed to reasonably clean the corrector, if something remains, it most likely won't cause any visual problems and can be addressed the next time a cleaning is given. Some spots may not come off and my 11" is an example, but not any problem.

The corrector coating is fairly hardy, it should not be scratched by cleaning unless a foreign substance gets under the wipes.

That is why the Kleenex should be changed frequently.

Alan
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