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GOT TO GO TO GOTO RESTO....

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142 replies to this topic

#51 Compressorguy

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Posted 31 December 2018 - 04:22 PM

Very high level of awesomeness! Simply Gorgeous!

 


Edited by Compressorguy, 31 December 2018 - 04:25 PM.

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#52 TOM KIEHL

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Posted 31 December 2018 - 05:40 PM

Very high level of awesomeness! Simply Gorgeous!

Thanks Scott . Coming from you  that means a lot .  Your "Level" of restoration is in a class of " awesomeness" in it self . It was a fun resto to see how close I could match the original tones and finish .



#53 Pete W

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Posted 31 December 2018 - 06:21 PM

Tom, your work is beautiful!    The hope is that by studying your photos I will be inspired to begin a "build a box" project for my Sears 6339a.  Actually the box doesn't have to be built - I picked up a 48" long box that will fit the scope but it is completely empty.   I need to construct the wooden inserts and slots to cradle to OTA, finder, mount, tripod and accessories.  A daunting task to say the least, but seeing your work lets me know it is do-able.    


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#54 Kokatha man

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Posted 31 December 2018 - 06:25 PM

...top shelf, professional case restoration Tom! waytogo.gif waytogo.gifwaytogo.gif What we want to know now is - how has that objective lens responded..? 


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#55 TOM KIEHL

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Posted 31 December 2018 - 07:30 PM

 What we want to know now is - how has that objective lens responded..? 

I'm half afraid to look bigshock.gif scared.gif


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#56 shredder1656

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Posted 31 December 2018 - 07:41 PM

Tom, you never cease to amaze. That is an impressive piece of art!
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#57 deepwoods1

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Posted 31 December 2018 - 10:08 PM

Beautiful job! 


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#58 TOM KIEHL

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Posted 01 January 2019 - 12:41 PM

Ooooo....   Please show us a pic of the lens. 

 

 

Is that a spiral galaxy imprinted onto the lens?

 

 

I recommend that you figure out that lens before you spend any time on anything else. 

 

 

Nooooooooooooo.........That would be a shame.

 

 

Gee, I hope you can revive that lens Tom...

 

 

 What we want to know now is - how has that objective lens responded..? 

THIS DOES NOT LOOK GOOD !  ..... I tried everything , The first image is a before cleaning attempts , the following three are after cleaning attempts  .  NO CHANGE !  bawling.gif nonono.gif

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#59 terraclarke

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Posted 01 January 2019 - 12:55 PM

Wow on the cabinet! I hope the objective comes out as well.


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#60 clamchip

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Posted 02 January 2019 - 11:12 AM

I would take a good look at that swirl with high power, a dissecting microscope would be

perfect and see if the swirl is on the glass and you need to hit the right solvent, or in the glass

like it's etched or something.

If it is etched I don't know if Barry at D&G is still doing lens work but you might check and see

if he can polish it for you.

 

Robert


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#61 shredder1656

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Posted 02 January 2019 - 12:24 PM

Whoa! That lens is scary. Bummer. I hope it can be restored some way.
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#62 Pete W

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Posted 02 January 2019 - 06:11 PM

That’s a shame about the lens.  Earlier in the post you mentioned that the grime looks like mineralization. Have any of the cleaning options you’ve tried been acidic?  Dilute acid like cleaning vinegar should dissolve calcification...just a thought.


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#63 TOM KIEHL

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Posted 03 January 2019 - 10:45 AM

 I hope the objective comes out as well.

 

 

I would take a good look at that swirl with high power, a dissecting microscope would be

perfect and see if the swirl is on the glass and you need to hit the right solvent, or in the glass

like it's etched or something.

If it is etched I don't know if Barry at D&G is still doing lens work but you might check and see

if he can polish it for you.

 

Robert

 

 

Whoa! That lens is scary. Bummer. I hope it can be restored some way.

 

 

That’s a shame about the lens.  Earlier in the post you mentioned that the grime looks like mineralization. Have any of the cleaning options you’ve tried been acidic?  Dilute acid like cleaning vinegar should dissolve calcification...just a thought.

Thanks all ! ........ Robert , I don't have a " Dissecting Microscope  " But I do have a pen shaped microscope that is 50X that is used in the steel industry to measure surface imperfections as in scratches . It does appear to have some what appears to be ETCH . I do not know if Goto applied a AR coating to the lens . If so it could be a coating deterioration . In that case the only thing I have not tried is Real Lemon , Lemon Juice to remove the COATINGS , If it is coated ? .....I have tried ......Meade's formula lens cleaner , Acetone , Lacquer thinner , CLR , Micro 90 ( lab glass cleaner ) , Ponds facial cleanser , Glass Wick , MEK , Denatured Alcohol , Ammonia , Bleach , and maybe some I forgot .... All to no avail . The only thing I have not tried is some sort of straight Citric acid as in the Real Lemon brand , lemon juice . I'll soak the crown only to attempt to remove the AR coatings , IF , It is coated ????? .  What do I have to lose ?    shrug.gif



#64 davidmcgo

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Posted 03 January 2019 - 04:00 PM

When I had bad mineralization on some new windows on my house courtesy of a failed sprinkler head, what worked was rubbing with a Bounce dryer sheet soaked in white vinegar.  It left the low e sun coating intact.  Trick suggested by the local Milgard dealer.

 

That might be worth a try before the Real Lemon.

 

Beyond that, may be time for some superfine cerium oxide and a lap.

 

Dave


Edited by davidmcgo, 03 January 2019 - 04:01 PM.

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#65 TOM KIEHL

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Posted 04 January 2019 - 08:36 AM

 Bounce dryer sheet soaked in white vinegar.


 then Real Lemon.

 

 May be time for some superfine cerium oxide and a lap.

 

Dave

Thanks for the suggestion Dave , I tried the Bounce sheet and white vinegar ...... No Go tongue2.gif it's still there .

 

Then an overnight soak in Real Lemon , lemon juice .........

Still nothing ! Apparently  Goto lens are un coated and the " Swirl " is still present .

 

Upon further , closer inspection with the pictured instruments   https://www.worthpoi...-mike-404356099 A Dumaurier 50X Micro Mike and a the magnifying lens  I have come to the conclusion that the Crown " Swirl " is most definitely ETCHED into the skyward face of the crown . What could of done this horrendous " Swirl " etching ? scratchhead2.gif

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#66 shredder1656

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Posted 04 January 2019 - 08:44 AM

Yeah, what could have?!? That's disturbing and disappointing!
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#67 davidmcgo

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Posted 04 January 2019 - 10:06 AM

Sorry to hear those didn't work.  Probably fungus or some acidic contamination left on it for a long period.

 

Dave


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#68 terraclarke

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Posted 04 January 2019 - 10:15 AM

My most sincere condolences! bawling.gif

Look on the bright side, without the objective, and with that mount and long tube, it will make an extremely accurate bottle-rocket launcher. lol.gif

Fire in the hole! bombdrop.gif

(All kidding aside Tom, I’m really sorry to hear that. I suspect salt-air was the culprit.)
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#69 Esso2112

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Posted 04 January 2019 - 02:02 PM

Major bummer Tom. A sad day in classics land.
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#70 clamchip

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Posted 04 January 2019 - 06:50 PM

All is not lost, I'll bet with a little research you can polish that surface.

I don't know a thing about grinding and polishing lenses or mirrors but

 what you have there is 99% done you just need to polish it out.

that surface is probably a sphere, I don't know how you go about making 

a lap for it. 

Maybe you can use that surface to make a pitch lap, I'm not sure how 

you do it.

Or another thought is to have it professionally done, this is probably the

safest plan being a Goto, not many of these out there.

 

Robert 


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#71 strdst

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Posted 05 January 2019 - 01:23 AM

Oh my that lens!

 

Some time ago I started a thread about a Swift 839 objective that went to **** when I cleaned it. It became a cloudy smeary coatings mess. I had experience using Real Lemon saving a Goto eyepiece with a coating breakdown. The end result was a clear glass uncoated eyepiece. I tried soaking the Swift crown element in Real Lemon for a few days and nothing changed so I upped the anti and lowered the pH and went to sulphuric acid sucked out of a tractor or truck battery. After a few days soak, keeping the solution warm, the coatings yielded to clear clean glass.

 

If someone has that thread available... I couldn't find it in an archive search. Anyway worked for me, last (ish) resort, wear eye protection!


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#72 Kokatha man

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Posted 05 January 2019 - 02:26 AM

...probably sacrilegious Tom - but if the other options don't pan out perhaps a high quality objective with similar specs might be entertained as a replacement..?!? bigshock.gif x.gif whistling.gif

From my heretic perspective it reminds me of that old poem about "for the want of a nail, a shoe was lost..."  


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#73 TOM KIEHL

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Posted 05 January 2019 - 07:01 AM

Something came in the mail . What could it be ?

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#74 shredder1656

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Posted 05 January 2019 - 10:05 AM

A set of tiny mirrors, some epoxy, a hole saw, and screws, to turn your GOTO 'fractor into a 'flector?

 

 

 

Don't they say, "Somebody's gotta be first."  Maybe that's not how it goes.  

 

 

 

...

 

Sorry.  


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#75 shredder1656

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Posted 05 January 2019 - 10:08 AM

...probably sacrilegious Tom - but if the other options don't pan out perhaps a high quality objective with similar specs might be entertained as a replacement..?!? bigshock.gif x.gif whistling.gif

From my heretic perspective it reminds me of that old poem about "for the want of a nail, a shoe was lost..."  

 

Funny, Darryl!  I use that same adage, along with "A stitch in time...", "An ounce of prevention...", and "Failing to plan...", etc, with my kiddos.  They don't find it to be quite as inspiring as I.  Probably my timing.  lol.gif 


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