Search found 44 matches

by AndiesHandyHandies
Thu Mar 21, 2019 4:59 pm
Forum: Solar Scope Modifications
Topic: PST Mod Reflections back off the Blocking Filter
Replies: 16
Views: 443

Re: PST Mod Reflections back off the Blocking Filter

Hi Had some Sun yesterday, Normal contrail based clouds over Derbyshire and some cloud. I had tried moving the PST etalon screw as adjustment near the one end but decided to move it back as reflections moved about a lot. I removed the Beloptic KG3 from before the etalon and put it on the eyepiece wh...
by AndiesHandyHandies
Sun Mar 10, 2019 11:28 am
Forum: Solar Scope Modifications
Topic: PST Mod Reflections back off the Blocking Filter
Replies: 16
Views: 443

Re: PST Mod Reflections back off the Blocking Filter

Hi Ken,

If there are no pins and groove in some how is the prism assembly constrained to be in the right position as it slides?

Were the first ones with the Gold/reddish objectives made in Mexico?

Does the serial no indicate where they were made? And the mechanism details inside?

Andrew.
by AndiesHandyHandies
Sat Mar 09, 2019 9:33 am
Forum: Solar Scope Modifications
Topic: PST Mod Reflections back off the Blocking Filter
Replies: 16
Views: 443

Re: PST Mod Reflections back off the Blocking Filter

Hi Ken Its not my blog. The prism assembly is upside down. Clearly the pins must slide in a slot and the block sit on the flat base. In this Post there is an image of the base with the prism assembly removed, the screw is still there, and you can see the slot. www.cloudynights.com/topic/530890-newbi...
by AndiesHandyHandies
Fri Mar 08, 2019 5:05 pm
Forum: Solar Scope Modifications
Topic: PST Mod Reflections back off the Blocking Filter
Replies: 16
Views: 443

Re: PST Mod Reflections back off the Blocking Filter

Hi Ken, There is a photo of a totally removed prism system in here with the two pips, near the end. There has to be some mechanical guidance. fullerscopes.blogspot.com/2018/02/ I have not done any investigations yet, I just assumed it could be off the blocking filter as well baffled into the block. ...
by AndiesHandyHandies
Thu Mar 07, 2019 4:22 pm
Forum: Solar Scope Modifications
Topic: PST Mod Reflections back off the Blocking Filter
Replies: 16
Views: 443

Re: PST Mod Reflections back off the Blocking Filter

Hi Doing some research. My pentaprism seems to have flopped down. DavidG on CN just twisted his back and let it settle down till it was parallel to the top of the housing. Whilst I can twist mine it still settles down as before. What is actually twisting? There seems to be a base square of metal wit...
by AndiesHandyHandies
Thu Mar 07, 2019 2:51 pm
Forum: Solar Scope Modifications
Topic: PST Mod Reflections back off the Blocking Filter
Replies: 16
Views: 443

Re: PST Mod Reflections back off the Blocking Filter

Hi

I was not aware that a mod needed the prism to be in a certain position.

I thought the penta-prism design meant its orientation did not matter.

I forgot I have an original gold/reddish objective so there is no ITF. !!!

Andrew.
by AndiesHandyHandies
Thu Mar 07, 2019 10:02 am
Forum: Solar Scope Modifications
Topic: PST Mod Reflections back off the Blocking Filter
Replies: 16
Views: 443

Re: PST Mod Reflections back off the Blocking Filter

Hi

The prism of course flops about. So its not parallel to the top of the box.

We have not unscrewed the eyepiece part yet.

Andrew.
by AndiesHandyHandies
Wed Mar 06, 2019 6:38 pm
Forum: Solar Scope Modifications
Topic: PST Mod Reflections back off the Blocking Filter
Replies: 16
Views: 443

PST Mod Reflections back off the Blocking Filter

Hi, I am moving forward slowly with the Vixen VMC110L PST Mod. I have a bodged up front baffle. The correction lenses in the secondary mirror holder did not have blackened edges so RodAstro made a little baffle for them. And a little baffle for the top of the primary baffle to only let the bright Su...
by AndiesHandyHandies
Tue Mar 05, 2019 4:08 pm
Forum: Solar Scope Modifications
Topic: PST Etalon Adjustment
Replies: 25
Views: 1115

Re: PST Etalon Adjustment

Hi Mark,

Any progress on finding the gasket file?

I am getting there on my PST mod and the sweet spot is definitely off centre it seems to me.

Andrew.
by AndiesHandyHandies
Fri Jan 25, 2019 9:39 am
Forum: Solar Scope Modifications
Topic: Collimator for Omega Bobs Filters
Replies: 7
Views: 329

Re: Collimator for Omega Bobs Filters

Hi Mark Were you using a PST type layout with the lenses and etalons inside the focal point? Peters images www.pbase.com/p_zetner/omega_halpha He used double achromats for the collimation / tele-centric lenses. He used the filters between the lenses for whole Sun images and after them in the tele-ce...
by AndiesHandyHandies
Fri Jan 25, 2019 6:06 am
Forum: Solar Scope Modifications
Topic: Collimator for Omega Bobs Filters
Replies: 7
Views: 329

Re: Collimator for Omega Bobs Filters

Hi The question is about optics which I am interested in a reply to! Unfortunately I had previously purchased a night time sodium and mercury light filter from Omega which was excellent. And now have a 2" as well. As a physicist I chanced to search Ebay on 'sodium notch filter' rather than LPR filte...
by AndiesHandyHandies
Thu Jan 24, 2019 9:37 am
Forum: Solar Scope Modifications
Topic: Collimator for Omega Bobs Filters
Replies: 7
Views: 329

Collimator for Omega Bobs Filters

Hi Based on AstroRods experience with a set of these filters I have looked round and found that professional Fabray-Perot spectral telescopes use this configuration. Double collimators with collimated and tele-centric positions. web.njit.edu/~cao/IBIS_Cavallini.pdf Page 4 digram. Somewhere it says t...
by AndiesHandyHandies
Sat Jan 12, 2019 9:13 am
Forum: Solar Scope Modifications
Topic: Baader 35nm as ERF
Replies: 2
Views: 294

Re: Baader 35nm as ERF

Hi Mark, Thanks for the link. With a 1.25" Barlow all the energy would be on a 1.25" filter behind a collimator. What I was thinking about the ERF being behind a collimator will not work here. And not needed as reflected focus inside the telescope. 127mm F7.5 Need a 1.33x barlow for F10. The PST Col...
by AndiesHandyHandies
Fri Jan 11, 2019 10:07 am
Forum: Solar Scope Modifications
Topic: Baader 35nm as ERF
Replies: 2
Views: 294

Baader 35nm as ERF

Hi I have come up with a way of using this as an internal ERF with no reflected hot spot. I have been working on my Vixen 110mm VMC110L PST conversion. For that I had to move the negative collimator lens forward in order to luckily just reach focus. I was having problems with a front Lunt ERF on red...
by AndiesHandyHandies
Sun Jul 01, 2018 5:47 pm
Forum: Solar Scope Modifications
Topic: Can i use my EDGEHD800 for Ha?
Replies: 10
Views: 1292

Re: Can i use my EDGEHD800 for Ha?

Hi Mark posted a tip for not cutting a refractor to reach focus, of moving the PST collimator lens, or equivalent for telescope F No, from the PST up the focuser tube. I decided to try a Vixen VMC110L to go with a 110mm Lunt EFR and a PST for a mod. Moving the 20mm Collimator lens into the front of ...
by AndiesHandyHandies
Tue May 22, 2018 5:48 am
Forum: Solar Scope Modifications
Topic: Vixen VMC110L F9.4 Maksutov as Solar Scope?
Replies: 28
Views: 2524

Re: Vixen VMC110L F9.4 Maksutov as Solar Scope?

Hi

Where is the best free place to place images to give a link to here?

Andrew.
by AndiesHandyHandies
Thu May 17, 2018 4:01 pm
Forum: Solar Scope Modifications
Topic: Vixen VMC110L F9.4 Maksutov as Solar Scope?
Replies: 28
Views: 2524

Re: Vixen VMC110L F9.4 Maksutov as Solar Scope?

Hi Lunt 110mm ERF makes up for increased aperture Vixen VMC110L PST collimator lens moved forward a few cm. Standard PST black box. I am not really bothered with full disk option as with standard PST you had to gimbal eye about to see details. Just scan the scope. I prefer to see more detail in the ...
by AndiesHandyHandies
Thu May 17, 2018 9:30 am
Forum: Solar Scope Modifications
Topic: Vixen VMC110L F9.4 Maksutov as Solar Scope?
Replies: 28
Views: 2524

Re: Vixen VMC110L F9.4 Maksutov as Solar Scope?

Hi, Rodastro got the PST block mounted on the back of the Vixen. Lunt 110mm derf just fits inside the dew cap. Taped on at the moment resting against felt circle on secondary cap. We got the PST apart. The Gold tube and Etalon came off on one go. When we stripped of the rubber tuning ring and took o...
by AndiesHandyHandies
Tue May 15, 2018 7:38 am
Forum: Solar Scope Modifications
Topic: Lenses for changing PST Focal Length
Replies: 6
Views: 941

Re: Lenses for changing PST Focal Length

Hi Mark, Thats what I thought. Are the Optisigma lenses a drop in? Personally the Lunt 110mm at 95mm would give F10 on the Meade 127mm Triplet to try. I am in the middle of a town on a windy ridge, near 'Windy Gap', so seeing might be a limitation. The Vixen would be more convenient to take out to r...
by AndiesHandyHandies
Mon May 14, 2018 9:25 am
Forum: Solar Scope Modifications
Topic: Lenses for changing PST Focal Length
Replies: 6
Views: 941

Re: Lenses for changing PST Focal Length

Hi Mark.

If you change the collimator do you need to have a matching re-focuser to balance out the abberations?

Are they a drop in fit? Are they bigger or smaller if not.

Thanks. Andrew.
by AndiesHandyHandies
Wed May 09, 2018 10:36 pm
Forum: Solar Scope Modifications
Topic: Lenses for changing PST Focal Length
Replies: 6
Views: 941

Re: Lenses for changing PST Focal Length

Hi

Are these simple lenses similar to those used in the PST Collimator?

https://america.optosigma.com/products/ ... oated.html

Andrew.
by AndiesHandyHandies
Mon May 07, 2018 11:38 am
Forum: Solar Scope Modifications
Topic: Lenses for changing PST Focal Length
Replies: 6
Views: 941

Re: Lenses for changing PST Focal Length

Hi Just come across Marks post with an alternative method of reaching focus without having to chop off a telescope tube. https://solarchatforum.com/viewtopic.php?f=9&t=12866&p=128272&hilit=pst+collimator+lens#p128272 Edmund Scientific stock negative achromats https://www.edmundoptics.co.uk/optics/op...
by AndiesHandyHandies
Mon May 07, 2018 8:58 am
Forum: Solar Scope Modifications
Topic: Lenses for changing PST Focal Length
Replies: 6
Views: 941

Lenses for changing PST Focal Length

Hi What size and focal length singlet lenses do I need to adapt the PST to work in collimation mode with a F7.5 telescope? Does the type of objective lens affect abberations? What sort of lens is the PTS objective, I assume a doublet as one was taken apart to polish off the failed ERF coating. Is a ...
by AndiesHandyHandies
Thu May 03, 2018 8:36 pm
Forum: Solar Scope Modifications
Topic: Make a native F30 telescope better for Solar
Replies: 10
Views: 1117

Re: Make a native F30 telescope better for Solar

Hi Christian, I have two etalon options to play with, The PST and Omega Bobs two 25mm 1.5nm H-alphas which are dielectric and a 25mm 40nm blocker he provides to protect them. I will take Marks advice and try my PST on the back of the Vixen VMC110L as is. I have a Lunt 110mm DERF so I was intrigued t...