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127mm Meade Triplet Mod

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AndiesHandyHandies
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127mm Meade Triplet Mod

Post by AndiesHandyHandies » Tue May 21, 2019 10:10 pm

Hi

I had second try with this PST Stage 1 mod.

After the first try I took the 2X ED barlow apart and Black2ed the holder.
Also the insides of the 4 2" etension tubes holding a front 2" filter, Baader 35nm.

This reduced the scattered light.

I have a 90mm F6.7 I bought a couple of Astro-Boot 1.25" 1.5X screw on Barlows (Put onto by Mark T). To get it to F10. They turned out to be different powers which may be useful.

I wanted a filter holder I could put in an extension stack to vary the power.

Luckily I found a Blue Fireball Technologies T2 Male and 1.25" Filter to T2 Female adapter.

This conveniently fitted between the PST AOK T2 adapter and the T2 to 48mm adapter to the 2X ED Barlow. Improved the scatter.

I tried to buy a couple of cheap Moonlight filters to use to hold my two 25mm Omega Bob 1.5A filters, so they could be used in different setups, simply screw in. They turned out to have nice steel holders but 23mm filters, Not the cheap plastic ones with 25mm filters as in my Vixen VMC110 PST adapter. However taking out the glass in one and screwing it into the T2 to 1.25" adapter was just right as a stop in front of Bobs 40nm 25mm ERF filter in the Collimator lens housing of the PST.

The problem was with back reflections off the Baader 2" 35nm on the front of the extension, which I used to reflect as much unwanted light away as possible before the PST etalon.

Using the scope without the Baader was OK. The Bobs 40nm ERF looks similar to the Daystar Combo front blocker, reflected hue, and it worked OK on its own at 127mm. And it does not have the back reflection problems of the Baader. Unlike the Baader it has full long IR blocking.

I had lent my Baader 2" UV-IR filter to Rod for his Bobs filter project and recently had it back. So I replaced the Baader 35nm with the UV-IR. This solved the back reflection problem. It must have a visible Anti-reflection coating on the back unlike the 35nm I presume. So BoBs ERF is relecting the out of band visible only.

Unfortunately Bob does not offer 2" version Rod said.

The seeing was not as good as my first try last week so could not see if the new set works as well.

Andrew

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Re: 127mm Meade Triplet Mod

Post by marktownley » Wed May 22, 2019 5:55 am

Sounds like you've been busy. Interesting to know about the variability in the astroboot barlows, like you say lends itself to more potential.
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Re: 127mm Meade Triplet Mod

Post by AndiesHandyHandies » Wed May 22, 2019 10:23 pm

Hi

First light with the PST Mod:

The Sun looked like the first solar picture in Pedros Post after any equipment images.

viewtopic.php?f=4&t=26149

And with the Bobs filter 1 placed on the Beloptic KG3 under the eyepiece the surface looked similar to the first orange sun with a full box of yellow sun to the right. Bobs filter 1 is slightly above the H-alpha line to the longer end, I lost half of the proms which would be motion away from us I presume.

Andrew.

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Re: 127mm Meade Triplet Mod

Post by AndiesHandyHandies » Thu May 30, 2019 7:06 am

Hi

The focusser tube extends 7ish cm beyond the extension tube stack with UV-IR at the front.
In my collection of filter step rings there was a 49 to 43 which screwed on the front seems about right to mask reflections.

I gave a second coat of Black2 to the bodge stop in front of the PST.

It was cloudy but clear gaps without contrail clouds. Slightly windy.

Rod said the background was good, better than his Zeiss. I have a bit of red with the Sun just out of the field.
Because the dew cap slides back its a bit shiny inside, Rod said people do not use dew caps for solar.

Rod converted a very cheap pair of Zeiss 45deg research grade microscope bino-viewers to 1.25" for me.
Rod reckoned he could see more Sun with them than the eyepiece. They have a collimator arrangement.
With those perched in the PST he said he could see more surface detail than on the Zeiss.

Unfortunately a tree intervened before I could have a look.

Andrew

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Re: 127mm Meade Triplet Mod

Post by AndiesHandyHandies » Sun Jun 16, 2019 8:08 pm

Hi

I have lent all my solar bits and telescopes to Rod to play with.

From his investigations with the ED 2x Barlow I was observing through the bare PST Etalon at F30.

So it seems to perform well in that configuration.

Look forward to a stage2 mod with 25.4mm Bobs H-alpha 1.5A Comb Blocker filter or Bobs 2 H-alpha 1.5A filters double stacked with the PST.

Andrew.

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Re: 127mm Meade Triplet Mod

Post by AndiesHandyHandies » Thu Jun 27, 2019 9:38 pm

Hi

First Stage 2 attempt.

The Collimating lens placed up the tube with extension tube bodge.

Double stacked with Rods set of 2 Omega Bobs 1.5A filters. Which put the focus about 200mm from the refocusing lens.

Reached focus OK.

Whilst no focusser after PST got a focus on the 9mm focal plane image.

Looked OK.

Need to get another Double Stack Omega Bobs setup made up with a low profile focusser.

Andrew.

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Re: 127mm Meade Triplet Mod

Post by marktownley » Fri Jun 28, 2019 4:51 am

Sounds like progress is being made!
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Re: 127mm Meade Triplet Mod

Post by AndiesHandyHandies » Mon Jul 01, 2019 6:12 pm

Hi

Thinking about a Stage 2 Mod on the scope without cutting the tube.

I want to use MarkTs idea to move the collimator up inside the current focussing tube so the PST Etalon can fit externally.

In the Vixen VMC110 Stage 1 Mod I moved the PST Collimator up a bit and I can reach focus for an eyepiece.
I can set the PST focusser in the middle and use the VMC to focus.
This assumes the moved forward PST Collimator produces a perfectly collimated beam so that the re-focusser is not aware the Collimator is further away and focussing is setting the eyepiece front focus at 200mm behind the re-focusser lens?

In the Stage 1 Mod try on the 127 I moved the PST Collimator up about 100mm and reached focus just using the 127 focusser.

However I presume that the focus might not be exactly 200mm after the Re-focusser, roughly that, so that the Collimator lens would not be exactly 200mm inside the 127mm original focus position.

Visually it looked OK.

Will moving the singlet Collimator forward affect the quality of the image anyway due to expansion of the beam?
Will having the singlet re-Focusser not exactly at 200mm from focus result in the singlet Collimator not being in an optimal position and so not producing a near enough collimated beam?

How much leeway is there on positioning?

Will using Doublet lenses be better? Produce a better collimated beam,and lower abberation re-focusser?

Andrew.

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Re: 127mm Meade Triplet Mod

Post by AndiesHandyHandies » Tue Aug 13, 2019 6:59 pm

Hi

Tried the Omega Bobs 1.5A filter as a replacement Comb Blocker.

I first tried on the Vixen VMC110 and with the filter well tilted to get its features out of field I got the proms with the PST tuner further round than normal.

Had to move to a prtable mount the get a glimpse in the 127mm over a tree.

Used various T2 extenders and a Blue Fireball T2 pass through filter to hold the collimating lens in its barlow nosepiece holder to reach focus on the 127mm.

Saw the proms straight away and sharper than the Vixen. Through the tree leaves.

Hopefully get another good day soon.

Andrew

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Re: 127mm Meade Triplet Mod

Post by marktownley » Thu Aug 15, 2019 1:14 pm

Sounds positive!
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Re: PST Blocking Filter modification unit by AOKSwiss

Post by AndiesHandyHandies » Fri Aug 16, 2019 6:43 am

Hi

I have moved the PST Collimator lenses out of the Etalon.

I have put a tilted Omega Bobs 40nm ERF in place of the Collimator lens. This works up tp 127mm in my experience, though I have a tilted 2" Baader 35nm futher up the focusser with a 48 mm to 43mm step down ring as a baffle in front. And I have a Beloptik KG3 UV-IR 25.5mm in the eyepiece as well for visual.

The Collimator is in an old Barlow nose piece with 28.5mm thread which goes into various configurations used to move it forward to reach focus without chopping down tubes. A Celestron/Skywatcher plastic Moon filter is used inside as the mount. There are 20mm baffles infront and behind the Collimator lens machined out of the Barlow body. Another customised Barlow for the Vixen VMC110 or in a Blue Fireball T2 pass through filter with 28.5mm in the middle for the 127mm refractor. The thread is long enough to go through the adapter and a Blue Fireball 48mm to 28.5mm screws on at the front of a diagonal or 48mm extensions as needed to reach focus on the 127mm.

The Re-focussing lens is mounted in a Celestron/Skywatcher plastic Moon filter and screwed into the front of a Blue Fireball 48mm to 28.5mm which is screwed into the front of a diagonal which goes in a AOK Swiss rear PST adapter. The PST screw on holder acs as a baffle in front. You could mount a new blocking filter in the diagonal of a mod. I am using a Omega Bobs 1.5A H-alphas as a Comb Blocker in a diagonal housing mounted on a tilter. It works well for prominences as brighter than the PST Comb Blocker.

As the Chromosphere is brighter I will need to work on dimming it, a second Omega Bobs or DS PST?

Andrew,

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Re: 127mm Meade Triplet Mod

Post by marktownley » Fri Aug 16, 2019 8:41 am

Hi Andrew, I moved the post above to this thread from the AOK blocker thread, it seemed out of context there, better to keep all detail in one thread.

Some pictures of how work progresses will help the dialogue here!
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Re: 127mm Meade Triplet Mod

Post by AndiesHandyHandies » Sat Aug 17, 2019 8:38 am

Hi Mark,

Can I post photo here of kit few MB ro do I need to load into a photo site?

Andrew

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Re: 127mm Meade Triplet Mod

Post by marktownley » Sat Aug 17, 2019 9:06 am

Either is fine Andrew :)
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Re: 127mm Meade Triplet Mod

Post by AndiesHandyHandies » Sat Oct 19, 2019 8:34 am

Hi

I had a brief try on Thursday.

Achieved focus with the PST collimating lens moved forward. All my 2" extensions and a 2" nosepiece was enough.
2" Baader 35nm as ERF.

Just had Bobs filter 1 of two held loosely in a Celestron/Skywatcher moon filter holder.

Tuned in OK.

Two nice large prominences.

But a reflection partially over the sun.

Waiting for a modded diagonal to hold both of Bobs filters. I seem to luckily have a 'production' set as no internal reflection or artefacts.

Andrew.

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