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Equipment Discussions >> Refractors

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mikey cee
Postmaster
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Reged: 01/18/07

Loc: bellevue ne.
Re: Chipped objective question new [Re: mayidunk]
      #6267606 - 12/22/13 09:27 PM

Couldn't you rotate the mirror to move the scratch behind the clip?? That's what I would do if it were mine. Mike

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Jobryant
sage


Reged: 01/13/09

Re: Chipped objective question new [Re: Jobryant]
      #6304161 - 01/10/14 12:57 PM Attachment (16 downloads)

Took me awhile to get these pictures posted mainly because I didn't want to look at the damaged glass. Out of site of of mind mentality. Funny thing is the scope seems to be a bit sharper then I remember before the chip. I thought for sure I was going see the opposite or at least think I was seeing the opposite but this isn't the case.

I just got back from viewing some deer and I was extremely impressed with the views I was getting. Maybe it was all in my mind or maybe the scope's collimation was a wee bit off before the fall and was knocked into perfect alignment after the fall but what are the chances of this happening. I'd bet slim to none. All things considered I am extremely pleased with the scope performance at the present time which makes it much easier to forget about the damaged objective.


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Jobryant
sage


Reged: 01/13/09

Re: Chipped objective question new [Re: Jobryant]
      #6304163 - 01/10/14 12:58 PM Attachment (14 downloads)

another

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Jobryant
sage


Reged: 01/13/09

Re: Chipped objective question new [Re: Jobryant]
      #6304167 - 01/10/14 01:00 PM Attachment (10 downloads)

another one

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Jobryant
sage


Reged: 01/13/09

Re: Chipped objective question new [Re: Jobryant]
      #6304170 - 01/10/14 01:01 PM Attachment (8 downloads)

almost done

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Jobryant
sage


Reged: 01/13/09

Re: Chipped objective question new [Re: Jobryant]
      #6304171 - 01/10/14 01:02 PM Attachment (12 downloads)

last one

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SteveG
Post Laureate
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Reged: 09/27/06

Loc: Seattle, WA
Re: Chipped objective question [Re: Jobryant]
      #6304333 - 01/10/14 02:13 PM

What happened to the dew shield?

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dan_h
Carpal Tunnel


Reged: 12/10/07

Re: Chipped objective question new [Re: Jobryant]
      #6304396 - 01/10/14 02:40 PM

Quote:

Quote:

I'm afraid the chip will affect your views. Have you taken the telescope out for a test?




Just during the day and I couldn't detect any issues caused from the chip.




In daylight, your eye pupil could be small enough that it is effectively stopping down the aperture of your scope and completely eliminating the chip. Of course, much depends on your pupil size and the powers used for viewing.

For example, with a 3mm pupil, viewing at 35X, the effective aperture of the scope is just 105mm. The chip is not going to affect this view. At 20X, the effective aperture of the scope is only 60mm.

You won't see the chip or its effects until you view at higher powers in the daytime, or at night when your pupil is larger.

dan


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Jobryant
sage


Reged: 01/13/09

Re: Chipped objective question new [Re: dan_h]
      #6304611 - 01/10/14 04:54 PM

I took the original dew shield off. What you see in the pics is my homemade retractable sun shade made of flocking paper and duct tape.

Makes perfect sense Dan. I was using the scope at 20x today so like you pointed out the damaged part of the objective was more than likely not being used. Since the objective has been damaged the highest mags I have used in it has been 85x and I didn't notice any ill effects due to the chip although I didn't use the scope much at this magnification.


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bakerrihan
member


Reged: 07/06/13

Loc: Amman, jordan
Re: Chipped objective question new [Re: Jobryant]
      #6304675 - 01/10/14 05:32 PM

I had the same thing in my unitron 60 mm and its fine just a reflictions some times will apear

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mayidunk
Don't Ask...
*****

Reged: 02/17/10

Loc: Betwixt & Between...
Re: Chipped objective question new [Re: mikey cee]
      #6304904 - 01/10/14 07:58 PM

Quote:

Couldn't you rotate the mirror to move the scratch behind the clip?? That's what I would do if it were mine. Mike



The scratch is just far enough from the edge that the clips won't cover it. It's not an issue though, because I'll never see it through the eyepiece anyway! Besides, its got Mojo now!!



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Bill Friend
super member
*****

Reged: 02/16/12

Loc: Maine
Re: Chipped objective question new [Re: Jobryant]
      #6305757 - 01/11/14 09:36 AM

I had a similar chip (by area) on a Towa 60mm. I blackened out the chip using a flat black magic marker and didn't really notice a difference in optical performance. I think seeing conditions and knowing that its there are the biggest factors.

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