Mod TS 152/900 Individual

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Galosimo
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Mod TS 152/900 Individual

Post by Galosimo » Tue May 05, 2015 8:44 pm

I make this review because it might be useful to someone on Changing PST.
It all started during one starparty to Bazena in 2013 when I saw in a PST normal and with the clouds, and among other things for a change. After some sacrifices here finally get the PST also in my house

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After a few months I began to think in fact I put the flea in the ear of the fact that there was the change until it was time for me unknown.
I began to take a telescope 120/1000 because I was interested in both the white light that H-alpha and I needed a report F10 diaframmandolo would 100/1000 for H-alpha and 120 for white light, and then found an offer that does not could pass up I rushed in with 150/1200 on HEQ5 project and then I returned. Reading on various forums ran into Solarchat from which I took a thousand ideas and the idea or almost final.

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After yet another thought and expense required shift focuser also decided to change the last Ziel 150/1200 and bought the Individual 152/900 precisely F6.

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Let's start with removing PST

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You have to start with degreasing hand and pst if no slides and try to remove the parts that come off easily and in the end I made a sort of vise to lock the rotation dell'etalon but without blocking the tube repeat the tube does not go blocked for not scratch it.
After removing all you get to the heart precisely the etalon

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In my case, wanting to use any opening or 152 mm because the PST is natively F10 you have to replace the front lens that has a concave floor diaphragmed from 25-200 to 20-200 block from here F10, now for my case F6 , from the calculation I need a 25-120 that diaphragmed my knowledge 20-120 F6

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A tool of luck for the release of the clamp screw lens

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I had to build a thickness with cardboard because the lens is slightly lower

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Now the etalon is affixed to my focal lacks proof provisional because it is not over.

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Now is my phase 2, in theory jargon it says: Phase 1 off the etalon and mount it in the telescope classic 100 F10 Phase 2 would remove the third box they know within the lens replacement / corrective lenses of ' etalon, but let us.
In the test I noticed a lot and I mean a lot of scattered light, the pst dismounted and saw that within the prism was worked on as many as four faces and pointing a green laser inside the box lit up the face of the scattered light and took off to I mean that too.
The calculation of the diagonal of about 1.25 8 CM more an extension of about 12 would give me what I need 200 MM is the result with some correction made after

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The BF 5 MM original practically an invisible little hole

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Here it is mounted to the test

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Ok evidence, all right, but the field is still too small, na misery of BF5, now stand on the French market at a bargain price BF10 so to speak. Just get home I take the caliber and dismount and start the measurement, under 9.5 above 10.00 immediately take the picture BF10 inside and I measure 12MM Yay, now I take the drill and the harbor nearly 11MM, and I mount.

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ITF back to the filter for both the BF5 and BF10 is 15 mm

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Please try again with a further modification of the instrument tube focusing of (replaced with focuser SC more fitting 50mm step 1) because during the upgrade, too.

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Here a picture of the revision of HEQ5 after mounting: new bearings, motors Go-To, greasing, and arriving at the new Tripod.

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Here is a picture taken with Cell

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I hope you find it useful for some ideas. Hello ragsss what if you need just ask!

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Re: Mod TS 152/900 Individual

Post by swisswalter » Wed May 06, 2015 4:18 am

Hi Galosimo


what a great story, congratulations and thank you very much
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Re: Mod TS 152/900 Individual

Post by Derek Klepp » Wed May 06, 2015 8:10 am

This will be very helpful to modders thanks .

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Re: Mod TS 152/900 Individual

Post by Galosimo » Wed May 06, 2015 8:16 pm

thank you all

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Re: Mod TS 152/900 Individual

Post by marktownley » Thu May 07, 2015 5:33 am

Always good to read a mod story :)
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Re: Mod TS 152/900 Individual

Post by Galosimo » Thu May 07, 2015 2:09 pm

It will not be at the highest level but your type gets along pretty well

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Re: Mod TS 152/900 Individual

Post by Galosimo » Fri May 08, 2015 12:58 pm


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Re: Mod TS 152/900 Individual

Post by Lukasz83 » Fri May 08, 2015 6:54 pm

Nice job! Congratulations :)

What can you say about sweet spot?
Is it small or acceptable in visual? What percent of Sun is cover by it?

I used etalon from Lunt 50PT to make my mod on TS 102/1100 and the sweet spot is relatively small - only 20-25% of Sun

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Re: Mod TS 152/900 Individual

Post by Galosimo » Fri May 08, 2015 7:26 pm

if you mean the part of the sun in h-alpha visible will be about a 15/20 but are still in the experimentation with light beam collimated by about f32, are now about 1.8 degrees and I have to go back at least 1 degree improving lose part of the cone but I do not care because I only have a BF10.

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Re: Mod TS 152/900 Individual

Post by Lukasz83 » Fri May 08, 2015 7:42 pm

thanks for reply :)

I mean that in wider field of view only some part of the Sun is "in band". So for example when I have full Sun in field of view only 20-25% of it is with details (filament, prots, etc...). The rest is without any detail - only red ball.
So I'm curious, if you have the same with your PST mod or not...

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Re: Mod TS 152/900 Individual

Post by Galosimo » Fri May 08, 2015 7:45 pm

yes, but then again this is still a beginning then you will see how to optimize. is now under study a system of about f30 / 32 then you will see.

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Re: Mod TS 152/900 Individual

Post by Galosimo » Mon Dec 12, 2016 5:29 pm

Hello to all. I write after many trials and to describe recent work done to 152/900 and now after having tried for over a year.
Hosostituito tuuto hindquarters combining two etalons pst without the collimator lenses
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and I assembled them into a telecentric studied for my focal then a telecentric 5x
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mounted before the telecentric there is a bf 15 coronado.
To optimize the weights and bilenciamento boss that causes telecentric I modified the focuser by building an extension machined from solid and 25 cm long 9mm thick, placing everything inside with calculations done previously.
Imageimage hosting
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I have an erf at full aperture front mounted 160 of Baader.
Imageimage hosting
the images are without sweetspot and very much higher compared to a heads up with a 152/900 mounted on the side of my friend with mounted quarks.

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Re: Mod TS 152/900 Individual

Post by marktownley » Mon Dec 12, 2016 6:48 pm

Wow! That's a nice setup! :)
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Re: Mod TS 152/900 Individual

Post by Galosimo » Mon Dec 12, 2016 8:14 pm

Grazie

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Re: Mod TS 152/900 Individual

Post by Vicchio » Mon Dec 12, 2016 9:26 pm

Beautyful setup! You've done a nice job, wich kind of ERF have you mounted?

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Re: Mod TS 152/900 Individual

Post by Galosimo » Tue Dec 13, 2016 3:45 am

Baader 160mm

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Re: Mod TS 152/900 Individual

Post by herve » Tue Dec 13, 2016 7:36 am

Nice job !
Is this refractor is good if we compare it with istar.
could explain where we can find the tuto to combine two pst etalon together ?

thanks

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Re: Mod TS 152/900 Individual

Post by Galosimo » Tue Dec 13, 2016 3:26 pm

I did it to me by a turner on my design

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Re: Mod TS 152/900 Individual

Post by Merlin66 » Tue Dec 13, 2016 3:45 pm

Herve,
Using a pair of PST etalons as a double stack - this can be achieved in two ways.
1. Use the stock etalons with the front and rear lens still in place, a custom machined M50 x 1 mm threaded adaptor holds the two etalons together (I have drawings available if needed) This arrangement I found to be very difficult to tune and I gave up after a while.
2. Remove the rear lens element from the front etalon and the front lens element from the rear etalon - use the same spacer to hold them together. This has been trialled by a couple of members and seems to be more successful.
Hope this helps.
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Re: Mod TS 152/900 Individual

Post by Valery » Tue Dec 27, 2016 7:26 pm

What the 5x telecentric system have you used?

How do you fix the reflections between the etalons - how do you remove the ghosts images?


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Re: Mod TS 152/900 Individual

Post by Galosimo » Tue Dec 27, 2016 7:58 pm

the system has made me beloptik germany and ghost reflections I do not.

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Re: Mod TS 152/900 Individual

Post by Galosimo » Wed Aug 02, 2017 10:24 pm

New Edit!
Then between the two etalon I have a fixed fitting ... well I have now made a threaded fitting with a ring that can block the etalon in a different position. In this way I can take off the reflexes that are formed, not that they give too much annoyance but now the sky beyond the solar edge is beautiful black, so the protrusions stand out better.

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Re: Mod TS 152/900 Individual

Post by bart1805 » Tue Aug 08, 2017 5:24 pm

Hi Galissimo, beuatiful set up! Did you change the front lense of the first etalon so you could use it with this scope?
And is the 5x telecentric really necessary?
Clear skies, Bart.

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Re: Mod TS 152/900 Individual

Post by Galosimo » Tue Aug 08, 2017 5:30 pm

I removed all the lenses from the etalon. You need the telecentric x this system I designed.

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Re: Mod TS 152/900 Individual

Post by bart1805 » Tue Aug 08, 2017 6:03 pm

Thanks, but I don't understand it completely. Normally you would say that you need to put the first etalon minus 20 cm of the focal point of a F10 scope.
But if you change the front lense of the etalon with another concave lens you can get away with something else.

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