Image of the day

Captured by
Terry Wood

Jupiter (clearer) Nov 5th 2023 w/Mewlon 180c

My Account

New to Astromart?

Register an account...

Need Help?

Cleaning the objective

Started by mvollmer, 02/21/2003 12:23AM
Posted 02/21/2003 12:23AM Opening Post
Hello. I just purchased a used Takahashi 102 from an individual and the objective is pretty dirty. I would like to know what the best method is to clean it. Any one have any experience here?

Mike
Posted 02/21/2003 07:25AM #1
Mike
The technique I use is as follows.

Remove lens cell or dewcap so lens is easily accessed.

Place lens on a table so the glass is sitting horizontally.

Blower brush away any dust repeatedly.

Make up about 20 wads using lens tissue with a small pinch hand can hold them with.

Add two or three drops of lens cleaning solution(isopropyl alcohol and distilled water mixed 70% and 30%)to a wad and gently apply to a portion of the lens. (Apply do not rub vigourously)You do not want the solution dripping from wad so each wad needs to be half a lens tissue in size.

Throw tissue away then use a fresh wad to remove the worst of the solution by gently dabbing and then another wad so no liquid is on lens.

Repeat right round lens.

Let lens sit for a few minutes then check the results. What may look like smears will hopefully evaporate away while you wait.

Blower brush any extra dust that may have stuck to the lens while sitting.

Best of luck. As the FS Takahashi lenses are hard coated you should not damage coatings if you are careful.

Kevin