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22337Re: strange speckles

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  • infiniband01
    Apr 30, 2013
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      Hi Timm
      Thank for your suggestions.
      I will try to remove the dew shield and the entire lens cell as suggested and let you know the results.
      Thanks again,
      A.

      --- In William-Optics@yahoogroups.com, "Timm B" <t.bottoni@...> wrote:
      >
      > Hi,
      >
      > Must be dust of some sort, probably nothing that will damage the glass, but it might be a good idea to use a lens blower (don't use canned air!!!) or a soft cloth or lens cleaner designed for high quality optics. Be careful when cleaning it, don't drop it of course, and don't use anything harsh.
      >
      > You can remove the entire lens cell by unscrewing it and it shouldn't affect anything. I did this years ago when I bought the APOgrade for my 80SD to turn it into an 80FD and even sold the old lens cell to someone interested in it.
      >
      > The focuser also unscrews from the tube in case you want to blow out the dust that might be falling onto the lens.
      >
      > Do you know how to remove the dew shield? I'm not positive on that model (most are the same), but I think the main white part unscrews from the gold ring, and then you can slide it off revealing the collimatable lens cell.
      >
      > Let me know if you need more help.
      >
      > Timm
      >
      > --- In William-Optics@yahoogroups.com, "infiniband01" <alexconte@> wrote:
      > >
      > > Hi all
      > > I'm new to this group and, actually, I.m new to the W.O. world as I've always used reflectors. I've just become an owner of a FLT 110 with the TMB design triplet got as a second hand OTA from another amateur liike me. The OTA arrived fine but after having moved it for installing the dovetail bar and a finder I noticed that some speckles started to appear on what seems to be the inner tube lens surface. I've checked the tube and seems clean but,neverthless, each time I move the OTA the speckles increase. A picture can be found here: http://groups.yahoo.com/group/William-Optics/photos/album/1185964082/pic/364816576/view?picmode=&mode=tn&order=ordinal&start=1&count=20&dir=asc
      > > I'd like to know if someone else has experienced such strangeness and if carefully removing the lens cell, cleaning and putting the cell back could affect the collimation ( I've performed some hardware "maintenance" on SCT's but never on refractors and triplets :) ).
      > > Many thanks to all of you.
      > > All the best,
      > > Alessandro
      > >
      >
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