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Author Topic: Two way spirit level for PST  (Read 1461 times)

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Offline firmament

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Two way spirit level for PST
« on: 14:19:46, 07 December, 2010 »
Hi all During the winter I cannot image the sun from my observatory because the roof of my home blocks the view.
The obvious solution would be to remove that roof, but my wife has valid objections against this approach :o)

So I have to use my mobile setup:
http://www.thefirmament.nl/solar_mobile.html

It is imperative that during setup my PST is absolutely level and I used the built-in bubble level of my Acuter Merlin mount to ensure this:
http://www.thefirmament.nl/acuter_mount.html

Alas: that bubble level proved to be grossly incorrect which resulted in bad polar alignment and thus an unwanted vertical shift during imaging :-\

Today I bought a nice 2-way spirit level in a caravan shop and glued it with double-sided tape on the PST: I am sure that this little gadget will be of considerable help when setting up!
http://www.thefirmament.nl/acuter_mount.html [just browse down a bit]

Of course also on my PST page http://www.thefirmament.nl/pst.html
and on my DIY page http://www.thefirmament.nl/diy.html

Groetjes/greetings from The FIRMAMENT Observatory

Jan Timmermans N 51.363 E 5.4622 (Valkenswaard - The Netherlands) <><
Astro website http://www.thefirmament.nl
PST + 2.5 PowerMate + Philips Vesta SC3 webcam

Offline Nomis Elfactem

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Re: Two way water level for PST
« Reply #1 on: 15:32:34, 07 December, 2010 »
An inspired solution Jan - might have to get myself one of those !

I have to say I quite often get "unwanted" verticle shift (and/or horizontal for that matter) but often find this a good thing as it acts like dithering and ensures the dust bunnies etc are removed as part of the stacking process (a little wind has the same effect).

Do you find field rotation an issue though on a Alt/Az mount ?  I'm guessing with a imaging run of less than a minute it will be removed as part of the alignment process in stacking ?!?  Just thinking out loud...

S.
Simon

Scopes: Astro-Tech AT-111EDT Triplet, TS65ED Quad, Orion ST80, Modded PST-90 Solar Scope, PST Cak (on loan)
Cameras: SXVF H694, Atik 16ic, Canon EOS 600d, DMK41, DMK21, QHY 5L-II (mono & colour)
Accessories: SX USB Filter Wheel, SX OAG, Baader LRGB Ha SI OII Filters, SharpSky Focuser
Mount: EQ6 (EQMOD), SW Star Adventurer, plus a lot (and I mean a lot) of other bits and pieces

Offline firmament

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Re: Two way water level for PST
« Reply #2 on: 17:07:28, 07 December, 2010 »
Hi Simon

My 2-way water level has not yet been tested in the field, but I am confident I will be happy :o)

Field rotation during 30 secs (or 2x 30secs when imaging prominence + solar disk) is neglectable IMHO.

In case you want more: Registax5 is your friend.
Page 20 of the manual says:
"Setting De-Rotate will only be usefull when 2 or more alignpoints are used. RegiStax will estimate
rotation on alignpoint#1 and alignpoint#2, if possible try to position these points (for de-rotation) as far
as possible apart. Using the Save derotated JPEG option will (during stacking) save all selected frames
after derotation as JPEG."



Groetjes/greetings from The FIRMAMENT Observatory

Jan Timmermans N 51.363 E 5.4622 (Valkenswaard - The Netherlands) <><
Astro website http://www.thefirmament.nl
PST + 2.5 PowerMate + Philips Vesta SC3 webcam

Offline Nomis Elfactem

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Re: Two way water level for PST
« Reply #3 on: 17:41:20, 07 December, 2010 »
Thanks Jan.  I'm on and GEM so field rotation isn't an issue for me but good to know how to fix it in Reg5 if needed !

I'm going to see Ken tomorrow (before he leaves these 'ere shores) so here's hoping I'll be able to get rid of the black box of my Mod soon !

S.
Simon

Scopes: Astro-Tech AT-111EDT Triplet, TS65ED Quad, Orion ST80, Modded PST-90 Solar Scope, PST Cak (on loan)
Cameras: SXVF H694, Atik 16ic, Canon EOS 600d, DMK41, DMK21, QHY 5L-II (mono & colour)
Accessories: SX USB Filter Wheel, SX OAG, Baader LRGB Ha SI OII Filters, SharpSky Focuser
Mount: EQ6 (EQMOD), SW Star Adventurer, plus a lot (and I mean a lot) of other bits and pieces

Offline firmament

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Re: Two way water level for PST
« Reply #4 on: 18:17:15, 07 December, 2010 »
Usually my PST rides my LX200 so not field rotation issues then; my mobile setup is Alt/Az but that does not worry me at all :o)

I am pleased that Ken is coming my way :o)))
Groetjes/greetings from The FIRMAMENT Observatory

Jan Timmermans N 51.363 E 5.4622 (Valkenswaard - The Netherlands) <><
Astro website http://www.thefirmament.nl
PST + 2.5 PowerMate + Philips Vesta SC3 webcam

 

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