On February 12, 2008 I bought this Coronado PST [Personal Solar Telescope] from someone who had purchased it 2,5 years ago to keep it .... as a collector's item!
So it had never been used, never even been taken from the cardboard box: I had the honour to open the cardboard box myself: the original tape was still in place.
Inside the box: the original Coronado hard-case containing the PST itself and a 12mm Kellner eyepiece.
I bought this PST to image Sunspots, Prominences, Plages and Filaments.
Meanwhile I have written the Sun in Ha - Webcam Imaging and Processing Tutorial.
Here is How to re-align the Prism

Aperture: 40mm [1.57inch] ; Focal Length: 400mm [15.75inch]; Focal Ratio: f/10
Bandwidth: less than 1.0 Angstrom
Blocking: 10-5
Wavelength: 656.3 nm [H-alpha]
Length: 381mm [15inch]
Weight:1.36 kg. [3 lbs]
And here is the Instruction Manual
The Serial number and the focuser knob.
The PST has a photo-tripod connection: you see my adapter installed.
Aiming is easy ...
I first position the scope such that the sun just illuminates [a.k.a. floodlight] the dust particals on the top and the side of the black house of the PST; the sun then pops up in the finder.

February 15, 2008 09:55 UT.
First light for my Coronado PST and also my first protuberance ever !
Imaging: Coronado PST with stock ToUcam webcam taped on top of the eyepiece holder.
I had to hurry as the sun was about to hide behind a roof ....
The PST piggy back on my LX200.
I could use my existing LX200 piggy back rail.
The camera is a Trust WB-5400 webcam in an experimental setup

A more stable configuration: Double Piggyback for Coronado PST: my PST gets a higher position.
This high position means that - unless the sun is very high - I cannot use the finder anymore, so I aim at the sun by looking at the dust particles on the sides of the PST house and at the same time watching the shadows on my observatory wall while also keeping an eye on my laptop screen.
Usually the sun pops up on my screen within seconds, even with the 2.5 Powermate mounted.
Meanwhile I have made this: Home made Solar Finder for the PST
Before buying the PST I knew that there are problems with the quality of the coating of the lens: the brown colour should not be there.
But I also knew that Meade - who owns Coronado - replaces the lens under warranty, and I had contacted the dealer in the Netherlands Ganymedes beforehand to make sure that the warranty was valid, even if I was not the first owner. They confirmed that the warranty was still valid and meanwhile the problem has been nicely solved by Meade Germany: they sent me a brandnew PST, so great service indeed !
ALIGNING THE PRISM
Here you can see the PST with the main prism clearly out of alignment causing ghost images: the top of the main prism should be exactly parallel with the PST house.
I removed the main prism myself by twisting and moving it a bit and very soon it came loose.
Note the small prism at the bottom left: that is the finder prism [there is a small hole in the front of the black house ...]
The main prism has been removed.
Next I used superglue to put the prism back where it belonged, making sure that the top is exactly parallel with the top of the PST house.
Aligning is not hard to do: just put the focuser in the top position and then glue the prism on its place.
Images captured afterwards proved that the ghost images had disappeared: mission accomplished.

When looking for a solution for more comfortable observing through the eyepiece I stumbled over the website of Rod Nabholz
I considered his approach a great idea and found a similar bag at the local Halfords store: Euro 3.99
Works fine !






The bag nicely fits over the eyepiece and is comfortable when looking through the eyepiece.
Coronado PST with Televue 2.5 Powermate and Vesta SC3 b/w raw webcam mounted on double piggy back platform ; William Optics Zenithstar 80 ED II APO with standard ToUcam Webcam operating with 0.6 Mogg Focal reducer and a stacked Baader Infra Red Blocking Filter/Baader Contrast Booster combo [to get the whole Sun in my FOV] and this whole assembly piggybacked on my Meade LX200 mounted on a wedge and pier.

In August 2009 I bought this Acuter Merlin Motorised Multi-Function Mount and Tripod, mainly to be used as travel mount for my Coronado PST and the OTA of my Skylux scope.
Here is a fine review written by Steve Wainwright.

Reaching focus with PST and webcam

When I first inserted my ToUcam plus adapter + Baader Infra Red Blocking Filter into the eyepiece holder I could not reach focus: I did not have enough inward travel.
I searched the internet and found that some imagers had modified the webcam so that the CCD would be closer to the PST, while others had done something to the eyepiece holder itself.
With the PST in my hands I had a close look and noticed that the eyepiece holder actually consists of 2 parts: the eye piece holder itself and another piece, which I describe as "the spacer". Note: As you can see below: my rehoused Trust WB-5400 webcam focuses nicely with the eyepiece holder + spacer installed: no disassembly required.
To unscrew the eyepiece holder plus spacer I used this handy household tool.
The rubber band ensures a firm grip without leaving any marks behind.
I did not have to apply great force to disassemble, actually it was quite easy.
Note: As you can see below: my rehoused Trust WB-5400 webcam focuses nicely with the eyepiece holder + spacer installed: no disassembly required.
Disassembled. I wonder about the use of the red filters, but I have decided to let them in.
The small red filter at the bottom of the eye piece holder seems to be the major blocking filter; I am awaiting confirmation of this.
The eye piece holder has the same threading as that spacer, so the eye piece holder can easily the threaded into the PST house.
You can see the prism inside the PST house.
Note: As you can see below: my rehoused Trust WB-5400 webcam focuses nicely with the eyepiece holder + spacer installed: no disassembly required.
The eyepiece holder, but now mounted without the spacer.
I gained 26.34 mm, this being the effective height of the spacer.
And yes: I can reach focus with my ToUcam + adapter + Baader Infra Red Blocking Filter.
Note: As you can see below: my rehoused Trust WB-5400 webcam focuses nicely with the eyepiece holder + spacer installed: no disassembly required.
Sun in Ha - my first Filament
March 25, 2008 10:12 UT.
Imaging: Coronado PST in prime focus and Vesta SC3 b/w Raw webcam, Baader Infrared Blocking Filter.

Active Region 1012: First SOLAR light for my ATK16IC camera.
February 14, 2009 12:03 UT.
Imaging: Coronado PST piggybacked on LX200 with Televue Powermate 2.5x and ATK16IC Deep Sky Camera, no filters.
209 exposures of 0.004 seconds.
Imaging and Processing not quite as per my Sun in Ha: Webcam Imaging and Post Processing Tutorial; the stacked output of 60 frames was saved as a FIT, loaded into Photoshop and processed with Fits Liberator, saved as TIFF.
Next: Wavelets in Registax 5 after which the final processing [colourising etc.] as described in my Sun in Ha Imaging and Processing Tutorial. Quite an interesting experience !
Sun in Ha
March 29, 2008 10:02 UT.
To my joy the Trust WB-5400 webcam - which I had rehoused - focuses nicely without any modification to the PST, with the eyepiece holder and spacer both in place.
Imaging: Coronado PST in prime focus and Trust WB-5400 webcam in b/w mode [1280x1024 pixels], no additional filters.
Here is the Full Sized Image with a Sun of 885 x 885 pixels.
I used these camera settings:

Field-of-View of the PST with WB5400 webcam:

Home made Solar Finder for the PST

With my PST riding high on my LX200 and when the sun is low during the colder period of the year I cannot see the finder window on top of the PST, unless I climb a small ladder.
So on a cloudy day I made this Solar Finder.
With the sun centred in the eyepiece I will look where the sun shines through the small hole at the front of the Solar Finder and hits the blind flange: there I will make a mark on the blind flange.
The next day there was a hesitating low sun so I mounted my PST on a static tripod and was elated to see the expected bright dot on the blind flange: success !
I made sure that the sun was right in the centre of the eyepiece and then provisionally marked the spot on the blind flange.
Re-aiming at the sun was as expected: right in the centre of the eyepiece.
And no more climbing as my Solar Finder is at the side of the PST.
PS: that front lens surely needs cleaning !
The finishing touch: I made a marker with crosshairs and glued it with double sided tape on the blind flange. To ensure that I glued the crosshairs marker exactly on the right spot I mounted my Televue 2.5x Powermate and Philips Vesta SC3 webcam on my PST, aimed at the sun and centred the sun on the live video screen.
Click here to download a Word document with printable crosshairs.
My Solar Finder has a bonus: as I do not need the original finder anymore I can cover the hole for the original finder [at the front of the PST] with a piece of tape thus preventing unwanted reflections inside the black house of the PST.

Two Way Spirit Level for the PST on Acuter Merlin Mount

The setup procedure of my Acuter Merlin Mount demands that my Coronado PST is perfectly horizontal.
In a caravan shop I bought this nice 2-way spirit level and glued it with double-sided tape on the PST.
A closer look ...

Mobile Solar Imaging Setup

My mobile solar imaging setup:
January 10, 2011.
Coronado PST on Acuter Merlin Mount; 2.5x Televue Powermate, Philips Vesta SC3a B/W webcam.
12Volt is supplied by a jump starter and my laptop is in the back of my car, nicely in the shade.
Please note the compass underneath the tripod.
Sun altitude: 15.3°.
My mobile solar imaging setup:
January 10, 2011.
Coronado PST on Acuter Merlin Mount; 2.5x Televue Powermate, Philips Vesta SC3a B/W webcam.
12Volt is supplied by a jump starter and my laptop is in the back of my car, nicely in the shade.
Please note the compass underneath the tripod.
Sun altitude: 15.3°.

Sunspot AR1140 with Filaments
January 10, 2011 09:54 - 09:57 UT.
Imaging: Coronado PST [on Acuter Merlin Mount] with Televue Powermate 2.5x operating at f/25 [focal length 1000mm]
and Philips Vesta SC3a B/W webcam, Baader Infrared Blocking Filter.
Sun altitude: 15.3°.
Mouse in/out to see/hide the colourised version.

Useful PST Links

Reviews:[there are many on the internet, but I selected these:]
Maurice Gavin
Michael McNeely [addresses the 'rusty lens' issue]
Tahir Saban

The tuning ring of the etalon:
When the tuning ring of the etalon is 'out-of-range' you need to calibrate it.
Also here

For real hackers: dismantling the PST and mounting it on other optics:
Teleskop & Sternwarte Zentrum - Austria [in German]
Bernd Gaehrken [in German]
Fritz Lensch [in German]
Matthias Bopp [in German]
Matthias Bopp [in English]
Pedro Ré [in English] [browse down to "How to dismantle a PST"]