Commercial adaptors for PST mods, Stage I and Stage II

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Commercial adaptors for PST mods, Stage I and Stage II

Post by Merlin66 »

I've just been knocked back by the third commercial supplier of astronomical accessories. I just can't seem to get them over the line. All I wanted was for them to supply a couple of "special" M50 threaded adaptors and use their existing range of spacers/ focusers to make up a "Kit" for prospective PST modders.
They are not prepared to take the "legal" risk of supplying parts "which are obviously designed to be used with a PST etalon"
To quote:
As for PST mods, as a dealer we have to be very careful because of safety concerns. I am certain that all the modifications you do are professionally made of course! But just in the unlikely event that something happens to somebody who uses a modded PST, we'll be legally liable for this.
The only remaining option, if I want to prepare such "Kits" is to manufacture the "specials" myself and distribute them with my "PST Mods" write-up.
I have never heard of ANY safety issue with a modded PST. I think there's more likelyhood of a "potential" problem if a White Light aperture filter was incorrectly assembled and incorrectly fitted to a telescope.
Where does a telescope "mod" become dangerous? When you add a Crayford focuser?
(Rant over...I'll take my pills now and go back to bed.)


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by swisswalter »

Hi Ken

don't worry be happy and stay up ;-)

you may want to order them in switzerland by astro optic kohler www.aokswiss.ch


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by marktownley »

Frustrating. I hear what you're saying Ken.

What size threads / adapters are required? Where there's a will there's a way, and between us on this forum I reckon we can come up with a solution... ;)


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by Merlin66 »

Walter,
I'm interested why this supplier doesn't feel the same legal pressure!!
The PST adaptors are about $50 each, front and rear....
I'd prefer a rear adaptor going from M50 to either SCT thread or a T thread.....


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by marktownley »

I'd prefer a rear adaptor going from M50 to either SCT thread or a T thread.....

So, a m50x1mm to SCT thread... what size is a sct thread?


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by Merlin66 »

Mark,
the standard SCT thread is 2" x 24 tpi..the adaptor needs to be long enough to allow the PST extention to sit inside....


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by marktownley »

OK, be patient with me here, never done a PST mod so trying to get my head around what is needed...

The m50 screws into the black box of the pst and the other end of the adapter is a SCT thread which screws into where?

Do you have a pic of one at all?


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by Merlin66 »

Mark,
For the stage 1 mod the gold tube is removed from the PST etalon/ Black Box and replaced with a larger aperture (with ERF)donor scope.
To fit the "black box' to the donor a 2" adaptor (to fit the existing focuser) with a male M50 thread screws onto the front of the etalon.
For the Stage 2 the etalon is removed from the "black box" - the rear thread of the etalon is a M50 male thread. To fit spacers and focusers/ blocking filters etc, you need a female M50 to say T thread adaptor, then add T thread spacers to get the correct spacing for the blocking filter...
Hope this helps.


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by marktownley »

Is this achievable by mating up readily available step up / step down rings?

Could you use one of these
http://www.ebay.co.uk/itm/260776776229? ... 1423.l2649 on the t-thread end

Then depending on whether you want a male or female m50 pitch on the other end either one of these http://www.ebay.co.uk/itm/250814682086? ... 1438.l2649 (for male end) or one of these http://www.ebay.co.uk/itm/120785714440? ... 1423.l2649 (for female end)



When I bought the second etalon to double stack my SM40 telescope house wanted £75 for the adapter (step up / down) ring - I ended up getting similar to the above for a couple of quid off flea bay, aluminuim too...


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by Merlin66 »

No.
The M50 is a 1.0mm pitch.


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by marktownley »

No.
The M50 is a 1.0mm pitch.

Dang! I knew it was too good to be true... Oh well! :whistle:


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by Photosbykev »

OK, be patient with me here, never done a PST mod so trying to get my head around what is needed...

The m50 screws into the black box of the pst and the other end of the adapter is a SCT thread which screws into where?

Do you have a pic of one at all?

All the bits and details are on my blog Mark http://www.photosbykev.com/wordpress/20 ... fications/


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by alex »

I've just been knocked back by the third commercial supplier of astronomical accessories. I just can't seem to get them over the line. All I wanted was for them to supply a couple of "special" M50 threaded adaptors and use their existing range of spacers/ focusers to make up a "Kit" for prospective PST modders.
They are not prepared to take the "legal" risk of supplying parts "which are obviously designed to be used with a PST etalon"
To quote:

The only remaining option, if I want to prepare such "Kits" is to manufacture the "specials" myself and distribute them with my "PST Mods" write-up.
I

Ken I can find you such adaptors custom made if you want!

Cheers
Alex


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by marktownley »

That's a brilliant account Kev! Thanks very much for that :)


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by Pedro »




I have a homemade adapter to fit the PST back box to my Taka FS102. It was done by a local machinist.

best


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by Merlin66 »

Alex, et al,
Thanks for the input. Yes, I can also get them machined and anodised etc, but then to have a "Kit" available I have to hold stocks and carry the costs......
(I've already had to do that when I designed a spectroscope kit for my forum members, investing $20k of my wifes money in components...)
I was hoping, as the commercial guys already have 90% of the parts in their stock, the additional two specials would have been a non-event.


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by occamfan »

I've just completed a stage2 PST-Vixen A80 mod and had quite a problem finding a way to couple the rear of the etalon.I eventually found a solution of sorts;an Astro Engineering SCT 2inch eyepiece adaptor seems to do the trick,although the SCT thread is 1mm larger, there are 2 nylon screws in the thread which hold the rest of the assembly rock solid tight. Not perfect but this seems to do the job- see pic.


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by marktownley »

Neat solution, thanks :)


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by swisswalter »

Hi Charles

very much welcomed to that wonderful TOS free site. Your solution is very neat


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by Roel »

For the rear end of the etalon I use a stock Crayford focuser with a SCT extension. That's it. One thing to keep in mind: the PST etalon screws a bit too far inside the adaptor so the tuning ring might get stuck. Luckyly, on the focuser end of the thread is a stop on which a spacer ring (or in my case, some smal nuts) can be placed. The threads are not 100% percent equal, but equal enough to make a tight fit.

The focuser can still be fully drawn inward and outward with the etalon mounted on the front, and when using the BF diagonal inside a 2" to 1.25" adapter the system reaches focus around 10mm from complete inward, including the tiny ERF tube. Without the tiny ERF some cm's further back.

Images:http://www.roelblog.nl/2011/07/70mm-pst ... -versie-2/

Crayford focuser with SCT adaptor: http://www.teleskop-express.de/shop/pro ... rains.html

Adaptor alone: http://www.teleskop-express.de/shop/pro ... 7-5mm.html



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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by occamfan »

Thanks Roel,
I've been considering getting a helical focuser to put behind the etalon until I saw your post,I don't know why I didn't think of this myself!So I've borrowed the SCT crayford from my LX90 and it seems to fit!see pic

Now all I need is some sunshine to try it out!!


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by Roel »

Looks great! Can you still turn the tuning ring?
I hope you'll have enough backward travel to reach focus! If not, a 2" extension tube will be a simple and cheap solution.


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by Merlin66 »

Yeah,
an additional spacer may be needed to get to +200mm...


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by swisswalter »

Hi Charles

looks great. Yes, I think too, an other additional spacer is necessary for the right distance


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by occamfan »

I think you are right,it is too short at the moment; however in the previous version where I was using an extendable T2 adapter, I tried a binoviewer with 20mm wide angle eyepieces. With this I had to remove a bit of length from the back,to accommodate the binoviewers' longer lightpath. This configuration gave the best views I've had so far.
The tuning ring turns freely but I've had a tight spot at one end of the travel for some time now,nothing to do with anything attached. It isn't getting worse,but is troubling. Has anybody experienced anything similar?


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by Merlin66 »

Re. The "tight spot" on the PST tuning ring.... I've seen this on a few PST's that I've modded.
I've never fully dismantled the PST assembly (Don't fix it if it's not broken!) but I assume this is due to the end stop?. It always happens on the red side of Ha - where the "top" design bandwidth position lies. You can obviously set-set the adjusting screw to the next hole and get a "bit more" tilt...but the extreme always seems to go "tight"
Don't know if this helps....just my 0.02 euro.


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by marktownley »

Ok, so just to clarify, for the back of the PST etalon we need something that is M50 x 1mm pitch?

So one of these should work

[ebay]130556460302[/ebay]


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by Photosbykev »

Ok, so just to clarify, for the back of the PST etalon we need something that is M50 x 1mm pitch?

So one of these should work

[ebay]130556460302[/ebay]

I thought the SCT thread was a 2" x 24tpi form and the etalon is M50 x 1p? The threads are close and people use them but personally I wouldn't want to hang any weight off the mismatched threads.

You also need to make sure the rear lens cells on the etalon is clear of the adaptor internal diameter

regards
Kev


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by Merlin66 »

As Kev says the threads are not the same...a bit of plumbers teflon tape will get you close enough to use it (until we find a better solution!)


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by marktownley »

This is being advertised as M50 * 1mm, so, if advertised correctly should be a match for the back of the etalon...


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by marktownley »

As Kev says the threads are not the same...a bit of plumbers teflon tape will get you close enough to use it (until we find a better solution!)

Sounds like my sort of bodge ;)

Will give it a go, I think i have one of these in my box of bits somewhere...


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by Merlin66 »

The ones advertised definately seem to be the SCT thread- not a PST thread.


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by marktownley »

The ones advertised definately seem to be the SCT thread- not a PST thread.

Suspect the one above is 'mis-advertised' then...

Does the plumbers tape approach work then for the other end, using one like this

[ebay]110720694788[/ebay]

To secure on the objective end of the etalon?


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by Merlin66 »

Hmm
You can buy commercial M50 nosepiece adaptors which are a MUCH better fit.
Details in my PST Mod doc.
ken


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by occamfan »

PST to 2" nosepiece adaptors are usually available here -www.scopesnskies.com/AstroBoot


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by marktownley »

PST to 2" nosepiece adaptors are usually available here -www.scopesnskies.com/AstroBoot

Brilliant! Picked one up thanks!!! B)


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by marktownley »

hey mark could you post a direct link to the 2" pst nose adapter you purchased, i couldnt find it on astroboot?

I'm afraid it's gone now - I bought it... :whistle: With astroboot it is whatever comes up on there for sale, I don't think they have a specific stock catalogue, just bits and pieces.

The rear adapter is coming from walters link in switzerland.


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by Merlin66 »

Great idea Rusty!
I bought mine from Telescop-Austria...but their latest website no longer shows them. I've sent an email to find out if they are still available.
(EDIT: Just had a look at the price page - it seems the pricing is without VAT...(currently 21% in Belgium!) so you may get hit for duties etc....)


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by iwatkins »

Not sure if you guys have seen this PST to 2" adaptor?

http://www.tavcso.hu/?o=termek&te=PST-50&n=en

Cheers

Ian


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by Merlin66 »

Lajos has confirmed he still sells the PST nosepiece adaptors, and currently has available stocks..
http://www.teleskop-austria.at/shop/ind ... pst-508-hu


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poita

Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by poita »

So that one is for the front of the PST, keeing the black box?


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by Merlin66 »

yes,
It can be used for the Stage 1 mod - keep the black box, or the stage 2 - dump the black box.


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by poita »

So I'd need two then to 'go all the way'?


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by swisswalter »

Hi Peter

you need two different adapter






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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by Merlin66 »

Peter,
the problem seems to be finding suitable adaptors for the rear of the PST etalon for a Stage 2 Mod..
I had some machined up for me. It needs an M50 x1 female and about 25mm long (to clear the body of the PST etalon)and have either a male T thread or 2" etc to use the rest of your spacers.
An SCT to T thread adaptor can be used, but this needs a few wraps of plumbers teflon tape on the PST thread to give a "good" fit. (The SCT thread is 2" x 24 tpi)


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by colinsk »

Ken, can you add your thread experience to the thread pitches thread?


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by marktownley »

Front nosepeice currently for sale on Astroboot http://www.scopesnskies.com/AstroBoot?needle=coronado


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Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by marktownley »

Just got my test delivery from Aokswiss.ch

Only took about four days total for delivery to the united states. IT looks like ill be going through with my next order of twenty (10 pairs).

These things are real heavy duty, top quality products. Veryvery nice!


Thanks Walter, I never would of known about these without your referral!

Yes, I picked up my rear adapter from Aokswiss also today from the post office. Completely agree Apollo, it's a lovely peice of kit. Also picked up the baader D-ERF, fits lovely in the filter holder I made. Gonna have a play around (weather permitting) tomorrow with the Omega etalon and this setup - shall be purchasing the PST for it's donor etalon at the end of the month when pay day rolls around again. Fun modding times ahead :)


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colinsk

Re: Commercial adaptors for PST mods, Stage I and Stage II

Post by colinsk »

I have seen lots of great variability in PST etalons. I would look through 10 before I bought one.


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