my "Sunlux" PST mod

Frankenscope? Let's see it!***be advised that NOTHING in this forum has been safety tested and you are reading and using these posts at your own peril. blah, blah, blah... dont mess around with your eyesight when it comes to solar astronomy. Use appropriate filtration at all times...
Post Reply
astrohardy
Oh, I get it now!
Oh, I get it now!
Posts: 34
Joined: Sun Jun 28, 2015 5:58 am

my "Sunlux" PST mod

Post by astrohardy » Sun Jun 28, 2015 7:18 am

Hi

Just saw this forum and just needed to register.
Completed a PST-mod some time ago, based on a 70/700mm "Skylux" refractor. Some years ago these telescope were offered here in Germany by a discounter (Lidl). They normally have decent optics but a lousy 1.25" focuser, and used ones are offered frequently on Ebay, flea markets and elsewhere. So Marcus Ettling from my astronomy club came up with the idea to use it for a PST mod, and he actually made a company produce the adapters on demand. So I just had to look out for a used ERF, order the adapter, cut the tube that it would be homofocal with a standard PST.

Image

Image

Works very nicely, and the resolution is much better than a standard PST. Focusing is done with the PST focuser. I use a DMK41 camera. In order to get the focus with a PST I need a barlow. With the mod I need some 13-15 videos for a full disk mosaik, which is easy to do. Here are some examples from the first year of operation.

Image
full resolution


Image

Image

As the PSTs generally suffer from brightness gradients across the field of view, one essential improvement was to routinely use flats, which I create by massively defocusing the telescope. Autostakkert can create a master flat from a video and also does the correction while stacking.

Currently thinking about modifying a 127mm refractor, which I am mainly using for white light imaging.


Hartwig

User avatar
marktownley
Librarian
Librarian
Posts: 24533
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Contact:

Re: my "Sunlux" PST mod

Post by marktownley » Sun Jun 28, 2015 8:55 am

Welcome to the forum Hartwig! That's a great mod that is producing some fantastic results. I like how you have your mount head fixed to the balcony too; very good!
Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

User avatar
GUS
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 1228
Joined: Thu May 08, 2014 12:03 pm
Location: Katoomba,NSW,Australia

Re: my "Sunlux" PST mod

Post by GUS » Sun Jun 28, 2015 9:10 am

Welcome to the site Hartwig. Fantastic mod and images.

Derek Klepp
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 12660
Joined: Wed Oct 19, 2011 10:02 am

Re: my "Sunlux" PST mod

Post by Derek Klepp » Mon Jun 29, 2015 10:56 am

A very successful mod

Vicchio
The Sun?
The Sun?
Posts: 8
Joined: Thu Dec 08, 2016 8:09 am

Re: my "Sunlux" PST mod

Post by Vicchio » Sat Dec 10, 2016 7:58 am

Very very nice solution!
What do you think about a "Sunlux" without the frontal ERF , on a stage 1 PST mod, with a second generation PST that have its internal Erf without filter on the original 40mm lens?

User avatar
marktownley
Librarian
Librarian
Posts: 24533
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Contact:

Re: my "Sunlux" PST mod

Post by marktownley » Mon Dec 12, 2016 11:35 am

I think you would need some kind of filtration to keep the heat off the etalon and stop it potentially causing the tuning to drift because of the heat.
Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

Post Reply

Who is online

Users browsing this forum: No registered users and 2 guests