Coronado BF10 straight-through conversion?

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
Gingerfish
Ohhhhhh My!
Ohhhhhh My!
Posts: 102
Joined: Tue Nov 03, 2020 1:56 am
Location: Norway/Northern Ireland
Has thanked: 60 times
Been thanked: 78 times

Coronado BF10 straight-through conversion?

Post by Gingerfish »

Since I only image, having a straight-through version of my BF10 would be nice. Has anyone in here done this? On paper, it seems pretty straightforward. But I bet it's not, or more people would have done it! :D


Clear sunny skies!
Chris

Lunt LS50THa
Lunt "Luntair" Altair 102ED
User avatar
marktownley
Librarian
Librarian
Posts: 42270
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Has thanked: 20424 times
Been thanked: 10243 times
Contact:

Re: Coronado BF10 straight-through conversion?

Post by marktownley »

No reason why not!


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
MalVeauX
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 1858
Joined: Tue May 09, 2017 7:58 pm
Location: Florida
Has thanked: 1171 times
Been thanked: 1360 times

Re: Coronado BF10 straight-through conversion?

Post by MalVeauX »

Yeap, its fine to do. There's nothing special going on with the diagonal. It's a basic star diagonal. The eyepiece side has the blocking filter. It's usually glued on (the 1.25" nose is glued, you'd have to break that adhesive to unthread it).

I converted one to straight through and even added a helical focuser to it, just to have more options to play with distances.

Very best,


User avatar
Stardust5858
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 1500
Joined: Tue Oct 29, 2019 11:44 am
Has thanked: 803 times
Been thanked: 1182 times

Re: Coronado BF10 straight-through conversion?

Post by Stardust5858 »

Just wondering if this can be done with the Lunt wedge too.


10ft x 6ft Solar RoR with Warm Room
Lunt 60mm Double Stack HA
80ed WL+ Lunt Hershal Wedge + Badder K-Line filter.
100mm AR + Lunt b1800 Ca-K module.
Neq6 Eq Mount.

2.7m Pulsar Dome.
11in Celestron SCT + White Light Filter.
70mm AR Stellavue.
12inch OO Newtonian.
Eq8 r Pro Mount.
User avatar
marktownley
Librarian
Librarian
Posts: 42270
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Has thanked: 20424 times
Been thanked: 10243 times
Contact:

Re: Coronado BF10 straight-through conversion?

Post by marktownley »

Stardust5858 wrote: Sat Feb 13, 2021 2:48 pm Just wondering if this can be done with the Lunt wedge too.
No, with the Lunt wedge the filters are mounted in the diagonal body rather then the nosepiece sections.


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
Stardust5858
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 1500
Joined: Tue Oct 29, 2019 11:44 am
Has thanked: 803 times
Been thanked: 1182 times

Re: Coronado BF10 straight-through conversion?

Post by Stardust5858 »

marktownley wrote: Sat Feb 13, 2021 3:07 pm
Stardust5858 wrote: Sat Feb 13, 2021 2:48 pm Just wondering if this can be done with the Lunt wedge too.
No, with the Lunt wedge the filters are mounted in the diagonal body rather then the nosepiece sections.
Thanks Mark, good to know.


10ft x 6ft Solar RoR with Warm Room
Lunt 60mm Double Stack HA
80ed WL+ Lunt Hershal Wedge + Badder K-Line filter.
100mm AR + Lunt b1800 Ca-K module.
Neq6 Eq Mount.

2.7m Pulsar Dome.
11in Celestron SCT + White Light Filter.
70mm AR Stellavue.
12inch OO Newtonian.
Eq8 r Pro Mount.
Gingerfish
Ohhhhhh My!
Ohhhhhh My!
Posts: 102
Joined: Tue Nov 03, 2020 1:56 am
Location: Norway/Northern Ireland
Has thanked: 60 times
Been thanked: 78 times

Re: Coronado BF10 straight-through conversion?

Post by Gingerfish »

OK! How long does the adapter have to be?

Thanks guys!


Clear sunny skies!
Chris

Lunt LS50THa
Lunt "Luntair" Altair 102ED
User avatar
MalVeauX
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 1858
Joined: Tue May 09, 2017 7:58 pm
Location: Florida
Has thanked: 1171 times
Been thanked: 1360 times

Re: Coronado BF10 straight-through conversion?

Post by MalVeauX »

Gingerfish wrote: Sat Feb 13, 2021 6:56 pm OK! How long does the adapter have to be?

Thanks guys!
Shouldn't matter, there's no optics that re-focus the light cone, just passes it through. Ideally make it as short as possible, but without masking the light cone. It's always easier to get distance out of the focuser, than back focus into the focuser.

Here's a straight through conversation and I even added a helical focuser:
PST_NoBlackBox_01_09092019.jpg
PST_NoBlackBox_01_09092019.jpg (133.89 KiB) Viewed 2237 times
Here's the BF retro fitted into an eyepiece barrel basically (or the 1.25" nose of any diagonal):
PST_adpated_BF_ITF.jpg
PST_adpated_BF_ITF.jpg (116.33 KiB) Viewed 2237 times
Very best,


Gingerfish
Ohhhhhh My!
Ohhhhhh My!
Posts: 102
Joined: Tue Nov 03, 2020 1:56 am
Location: Norway/Northern Ireland
Has thanked: 60 times
Been thanked: 78 times

Re: Coronado BF10 straight-through conversion?

Post by Gingerfish »

Excellent! :D


Clear sunny skies!
Chris

Lunt LS50THa
Lunt "Luntair" Altair 102ED
Post Reply