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Talk about your 100ed evostar

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#26 Arkade

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Posted 13 June 2025 - 12:53 PM

On the underside of the focuser, the screw in the very center is the focuser drawtube tension adjustment screw. That screw applies force underneath the platform that puts pressure on the Crayford shaft. Use a small Allen wrench to back it off just a bit if the drawtube is too hard to move with the focuser knobs, or tighten it up a bit if you think the drawtube moves too easily.


Do you feel my ones needs adjusting...the reason I thought as I'm also using a az5 and when I use the regular focus knob it gives a slight wobbles but then I switch to the finder focus and it is fine.

#27 Oldfracguy

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Posted 13 June 2025 - 05:58 PM

Do you feel my ones needs adjusting...the reason I thought as I'm also using a az5 and when I use the regular focus knob it gives a slight wobbles but then I switch to the finder focus and it is fine.

It could be that one of your large course focus knobs is rubbing against the focuser housing over some portion of its rotation.

 

One thing to check is to see if your focuser's drawtube is secure inside the focuser housing.  Extend the drawtube outward some distance and try to wiggle it up and down like the picture below (red arrows).  Make sure it does not wiggle, and that there is no movement at all at the entrance to the focuser housing (yellow arrow):

 

101_2655_2.JPG


Edited by Oldfracguy, 13 June 2025 - 05:59 PM.


#28 Arkade

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Posted 13 June 2025 - 07:44 PM

It could be that one of your large course focus knobs is rubbing against the focuser housing over some portion of its rotation.

One thing to check is to see if your focuser's drawtube is secure inside the focuser housing. Extend the drawtube outward some distance and try to wiggle it up and down like the picture below (red arrows). Make sure it does not wiggle, and that there is no movement at all at the entrance to the focuser housing (yellow arrow):

101_2655_2.JPG


Thank you for taking time to draw the diagram..I did that and the tube is secure, no movement..it actually seems smoother when I don't have the telescope on the az5....I feel it is just the az5 has the wobbles when I am using the focuser due to the weight

#29 Oldfracguy

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Posted 13 June 2025 - 09:06 PM

Thank you for taking time to draw the diagram..I did that and the tube is secure, no movement..it actually seems smoother when I don't have the telescope on the az5....I feel it is just the az5 has the wobbles when I am using the focuser due to the weight

Oh, that may very well be the case.  Here is a picture that I doctored of an Astro-Tech AT102EDL on my old AZ5, another 4" ED refractor that is a little shorter than the SW 100ED Evostar, being an f/7 instread of an f/9:

 

101_1466_2.jpg

 

 

I really think the SW AZ5 is only able to manage an 80mm f/7 ED refractor and anything smaller.  That is the reason I decided to go with a Celestron CG-4 and convert it to Alt-Az mode.  That CG-4 in Alt-Az mode will actually handle a 16-lb. AT115EDT:

 

101_2226.JPG

 

 

I try to use the CG-4 in Alt-Az mode whenever possible because of the slow-motion position controls.  I have to resort to using other types of Alt-Az mounts without slow-motion position controls, such as this Stellarvue M002C:

 

101_2516.JPG

 

 

or the Supermount W-Standard:

 

101_3281.JPG

 

 

for mounting larger and heavier scopes, but tracking targets at 250+x magnification is not as easy as it is with the slow-motion controls.


Edited by Oldfracguy, 13 June 2025 - 09:07 PM.

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#30 PKDfan

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Posted 14 June 2025 - 01:25 AM

20250614_001548.jpg

 

Nope as is stock AzGTi. Maybe for 20X the shakes would be okay maybe.

 

Dancing oscillations were rather pretty in its swaying jig at 82X in a slight wind.

 

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#31 Oldfracguy

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Posted 14 June 2025 - 02:14 AM

attachicon.gif 20250614_001548.jpg

 

Nope as is stock AzGTi. Maybe for 20X the shakes would be okay maybe.

 

Dancing oscillations were rather pretty in its swaying jig at 82X in a slight wind.

 

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Have you been able to try that AZ-GTi with that same scope on a sturdier tripod?  When I put my SW AZ Pronto Alt-Az mount with that same SW pier extension column on top of a "CG-4" tripod with 1.75" tubular steel legs, this 80mm f/7 scope went from having the shakes at anything above 80x to being rock solid at 200x:

 

101_3250.JPG


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#32 PKDfan

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Posted 14 June 2025 - 02:53 AM

Here is a very poor blurry image from a 11 TV Plössl i mineralized off that monstrosity above.

11 Plössl 100ED.jpg

and highly manipulated to pull whatever minerology from the tonal infrastructure that hides in plain sight- from my limited cameras software.

 

The general spectral cues when we look for them yes are rather bright and yes i wax rather poetic when talking about these razors of the sky.

 

Solving in focus chromatic aberration matters and i'm beginning to understand that full reconnection of the chromatic threads from completely snapping apart highly matters too, then you've built a virtuoso bravo lense.

 

-- as Ptincess Leah recently posted full chromatic aberration is rather lower on the list of aberrations to eliminate but oh boy if you do, and also get Hubble crippling SA dialed out, while also eliminating all of the other aberrations then both of my Consumer Grade scopes become Discovery machines-- as if its a routine chore to give views of a lifetime *when the seeing allows* and so my value priced two scopes have simply got it right and bravo.

 

SkyWatcher !!!

 

The minerology i detected visually upon Syrtis Majors innards, hematite blues ' the blueberries' Curiosity found liittering its landscape and green olivine tinges more on the perimeter were indications of its wavefront authority before i found truth at the rille in the AV.

 

Or witnessing Aristarchus hematite load flluorescing a watercolour blue in brilliant sunshine having a very distinct blue tint and examine the right flank of mare serentatatis for hints to the red orange textures seen Here at Apollo 17 landing sight In full glory from Harrison Schmidt- i think--look beyond the foreground and tell me you don't see an orange red tint upon that nearest far hill.

apollo-17-orange new.jpg

 

 

That was the most fabulous thing to discover Arkade from my particular specimen of  Evostar MINEROLOGY besides a few DSO's i'll share---M17 swimming stately upstream from M24 with it as a gazillion stars,

ngc 2024 the flame as an AP photo CREAM tint. OMG.OMG.

 

Or the double clusters spectral classifications easily categorized as each red giant just a slightly different hue thats with the ancient T2 20mm Nagler BTW and Lord Almighty the moon ... but won't bore you any longer with that but for Maurolycus flag waving serenade as it diffracted into 20-25 little flags as if in a stiff wind flapping them into stiff attention for a brief few minutes.

 

Jupiter oh so fickle Jupiter you are my white oval and thrice shot friend with storm vortex detail inside the GRS twisting my brain into unrecognizable shapes and with its ever changing complexions as almost imperceptibilities when contrasted against Fierce Mars tints and as a parting note to make you smack your lips and bite your tongue off on this --i've seen half of the Saturnian hexagon at its north pole.

 

The grand conjunction was such a lucky and  a glorious epiphany anf their obvious colour differences is never to be forgot.

 

oh my where were you when Shoemaker-Levy 9 crashed into it ??

 

Eyeball breaking stuff and you wonder why i'm madly in love with these things.

 

Need aperture to resolve stuff my arse.

 

 

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#33 PKDfan

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Posted 14 June 2025 - 02:56 AM

Have you been able to try that AZ-GTi with that same scope on a sturdier tripod? When I put my SW AZ Pronto Alt-Az mount with that same SW pier extension column on top of a "CG-4" tripod with 1.75" tubular steel legs, this 80mm f/7 scope went from having the shakes at anything above 80x to being rock solid at 200x:

101_3250.JPG


Not yet but soon Oldfracguy. I'll get the same as my EQM-35 with 1.75" steel legs.

Very soon now, like monday.


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