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100DS - Modified Quark using 2" 35nm ERF.

Posted: Tue May 05, 2020 6:32 pm
by AndiesHandyHandies
Hi,

I decided I needed more light pushing through my Quarks to make the image brighter and more contrasty.

Based on the 60DS I decided to use my Macro lens reducer technology I use on my night-time scopes.

To make a Celestron/Skywatcher 102mm F5 look to the 4.2x Quark like the 60DS lens.

First is a 2" 35nm Baader filter as the ERF. Provably by calculation and measurement the best to protect your blocking filter and get lowest etalon temperature, without additional narrower band filters of course.

48 to 49mm step up ring.
A 49mm 3 Dioptre (-300mm) macro lens, to big to fit through well made 2" focussers.
49 to 48mm step down ring.
48 to T2 step down.
Short T2 extender.
These push into the front of the removed 2" ring.
Baader T2 diagonal screwed on the T2 extender through the 2" ring.
2" ring screwed back onto the draw tube.
Two lock screws just grip the T2 ring. Make sure the T2 diagonal is snug to the 2" ring.
Short T2 1.25" eyepiece holder.

Counting tiles on a roof before and after get a 0.61x reduction. Target 0.7x.

Put in Chromosphere Quark 4.2x with no filter on 1.25" nosepiece.
Should be brighter with a Prominence.

Just reach focus on the Sun with 1/4! to spare!

Caculate Suns image just under 13mm diameter.

A lovely view of todays big prom late on in the day. 25mm Clave' Plossl. Tried a 16mm EFF eyepiece, a bit soft.

A pleasing result.

Cheers. Andrew.

Re: 100DS - Modified Quark using 2" 35nm ERF.

Posted: Wed May 06, 2020 5:55 am
by marktownley
Sounds promising Andrew, you need some pictures up of all these mods, easier to see what is going on.

Re: 100DS - Modified Quark using 2" 35nm ERF.

Posted: Wed May 06, 2020 7:55 pm
by Solar B
Yes some pics would be great plz

I'm not sure I understand the 60DS and macro lens reducer are you referring to the

Day Star 60mm DS ?

Brian

Re: 100DS - Modified Quark using 2" 35nm ERF.

Posted: Wed May 06, 2020 8:15 pm
by AndiesHandyHandies
Hi

I do not like cloud storage where when you open up they insist on synching all your images, like you are an avid social media poster.
Slowing things down.
Is there a suitable site where you can manually Post an image and thats it?

Hi Brian,

100DS is a play on the name of the Daystar DS60 product.

I am putting a 102mm F5 with a 0.6x reducer as it happens on the front of a 4.2x Quark.
The reducer roughly replicates the focal length of the 60mm lens infront of the DS60 smaller output Quark and I use my stand alone Quark after the reduced telescope.

I have found that DG modern Macro achromat lenses work well as focal reducers usually inside the telescope drawtube.
I adapt the camera size threads on the Macro lens to M48/2" threads. And then using an extension tube through the 2" holder on the draw tube screw the Macro lens inside the drawtube/telescope.
I can get about 0.7x reduction with sufficient back focus.

The aim is to make the image brighter to compensate for the circular polariser inside the Quark used to cut down reflections.

And it seemed to work. A cross between the flat uniform red quark and a more contrasty PST mod.

Tomorrow I am going to try something 'naughty'.

Andrew.

Re: 100DS - Modified Quark using 2" 35nm ERF.

Posted: Wed May 06, 2020 9:07 pm
by Solar B
Thanks Andrew

That all sounds very interesting .... I have a 60mm DS and like its convenience and user friendly-

ness over the quarks which I always found to be hard work at the EP.

I understand now ...... your effectively stepping your 100mm with a reducer down to about a

930mm FL of the 60DS in order to increase its brightness and it's been a success 👍

But please what you get up to behind closed doors should remain private 😅

Brian

Re: 100DS - Modified Quark using 2" 35nm ERF.

Posted: Thu May 07, 2020 5:58 am
by marktownley
AndiesHandyHandies wrote:
Wed May 06, 2020 8:15 pm
I do not like cloud storage where when you open up they insist on synching all your images, like you are an avid social media poster.
Slowing things down.
Is there a suitable site where you can manually Post an image and thats it?
Flickr? Or just upload image to here?

Re: 100DS - Modified Quark using 2" 35nm ERF.

Posted: Thu May 07, 2020 9:17 am
by AndiesHandyHandies
Hi

I was told off loading images up directly here due to shortage of server space.

Andrew.

Re: 100DS - Modified Quark using 2" 35nm ERF.

Posted: Fri May 08, 2020 8:19 am
by Merlin66
Yes, there is limited storage on the forum....
I use Dropbox as a mechanism to transfer larger files.

Re: 100DS - Modified Quark using 2" 35nm ERF.

Posted: Fri May 08, 2020 9:18 am
by marktownley
AndiesHandyHandies wrote:
Thu May 07, 2020 9:17 am
I was told off loading images up directly here due to shortage of server space.
It's fine to upload images here if they're small file size, sometimes we get direct uploads etc from a camera memory card for example, and then end up with a huge file size for an image that's only displayed 800px wide. Please do get pictures on, would love to be able to see all these things you're getting on with.

Re: 100DS - Modified Quark using 2" 35nm ERF.

Posted: Fri May 08, 2020 4:38 pm
by AndiesHandyHandies
Hi

RodAstro has told me how to make small pictures using Photoshop which he says I have somewhere.

Cheers. Andrew.