Takahashi TOA 130F
This is a closeup of the imaging train: the TOA/FS Reducer - the Percision Parts Custom Adapter- the 8300 OAG -and ST 8300 Color camera.
The Takahashi Dew Shield Problem
|The material that is covering the interior of
the dew shield began to deteriorate and the top material is like tiny
rubber balls that get wedged between the main optical tube and the dew
shield. This ends up making it impossible to slide dew shield in
The flocking (if you will) has a top layer of rubberized black material on a layer of very thin felt adhered to the inside of the dew shield with an adhesive film.
I am told that closing up the dew shield when it is damp (after a night of viewing) will start the process of deterioration and it only gets worse.
|The material that is covering the interior of the dew shield began to deteriorate and the top material is like tiny rubber balls. This photo shows the little balls adhereing to the Optical tube after the dew shield was unscrewed from the collar.|
|All the material that was inside the dew shield, the felt and the adhesive were softened with mineral spirits and charcol lighter fluid. After that it peeled off without a lot of effort. Then wiped clean with more solvent. Taking care to not get it on the exterior paint.|
|The bare and clean dew shield was then painted
with a flat black paint.
Once dry, the shield was replaced on the Optical tube and screwed onto the dew shield collar. I used some very thin velcro attached to the lens cell to pad the shield on the front so it would slide without touching the new paint directly.
The shield fits less snuggly than the original fit, I feel that is a good thing.
|In this photo you can see the thin velcro (above the f=1000) spaced between the lens cell and the dew shield. Three pieces are spaced equally arount the lens cell.|
|The finished dew shield project.
I want to thank Fred at Texas Nautical for walking me thru this project. Without Freds words of wisdom and experience I don't know how it would have turned out. Thanks Fred.