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lunt 50 mod

Posted: Sun Apr 09, 2017 2:52 pm
by DSobserver
After many years dealing with inconsistent Ha area with my PST mod, I decide to move to a lunt 50 mod.

Luckily my152/900 scope is close to lunt 50 f/d ration, so no barlow is needed!

I was also looking for a fully screw system.

here is the result :
Image

As you can see I also take the opportunity to connect a jmi focus system far better than original one!

Re: lunt 50 mod

Posted: Sun Apr 09, 2017 3:39 pm
by marktownley
Nice mod there!

Re: lunt 50 mod

Posted: Wed Apr 12, 2017 8:20 pm
by Valery
The sweet spot size should be about the same as with a PST Mod-2. Both etalons are air-spaced and both have the same working diameter - 20mm. The only advantage is the possibility to move the CWL of the etalon to blue and red wings.


Valery

Re: lunt 50 mod

Posted: Sat Apr 15, 2017 6:08 pm
by zorgdotnl
That's cool!!! :bow :bow :bow Do you have some images taken with it?

Re: lunt 50 mod

Posted: Sun Apr 16, 2017 1:52 pm
by DSobserver
yes here : http://www.webastro.net/forum/showthread.php?t=147279

valery,
you're probably right but it is less detectable and scope is f6 working vs f10 for pst mod!

Re: lunt 50 mod

Posted: Wed Apr 19, 2017 6:56 pm
by DSobserver
just measured : 24mm!

Re: lunt 50 mod

Posted: Wed Apr 19, 2017 7:00 pm
by marktownley
DSobserver wrote:
Wed Apr 19, 2017 6:56 pm
just measured : 24mm!
Always very useful to know, thanks! :)

Re: lunt 50 mod

Posted: Mon Oct 23, 2017 7:44 pm
by aboy
DSobserver wrote:
Sun Apr 09, 2017 2:52 pm
After many years dealing with inconsistent Ha area with my PST mod, I decide to move to a lunt 50 mod.

Luckily my152/900 scope is close to lunt 50 f/d ration, so no barlow is needed!

I was also looking for a fully screw system.

here is the result :
Image

As you can see I also take the opportunity to connect a jmi focus system far better than original one!
Hello DSobserver I have a question:

Do you think the specs of your 152 are the same from the TS152 telescope? https://www.teleskop-express.de/shop/pr ... uszug.html

I have years trying to do a PST modification but I fail in my first one and got disappointed of myself and stop trying that. But, I like the ide ato make a 152 telescope and lunt modification.

If is possible can you share some more pictures and specs of your modification?

I'm sorry if I bother you with my request.

Thank you :bow

Re: lunt 50 mod

Posted: Fri Oct 27, 2017 7:22 pm
by DSobserver
hello

TS scope is same as tecnosky one

lunt 50 mod is really easy it is a M68 screw same as the focuser from the scope! You'll immediatly get 95% of the mod.

Next if you want to change lunt focuser and get perfectly same distance between focus point and filter, you'll need some specific adapter.

I could comare visually this mod with 8" HAT : my "cheap" mod was impressive!

Re: lunt 50 mod

Posted: Fri Oct 27, 2017 7:23 pm
by DSobserver
of course I also add an internal 75mm erf!!!

Re: lunt 50 mod

Posted: Fri Oct 27, 2017 8:46 pm
by marktownley
Hmmm. M68 on the lunt 50. That does make things interesting in the mod department...

Re: lunt 50 mod

Posted: Sun Oct 29, 2017 5:55 pm
by aboy
DSobserver wrote:
Fri Oct 27, 2017 7:23 pm
of course I also add an internal 75mm erf!!!

DSobserver wrote:
Fri Oct 27, 2017 7:22 pm
hello

TS scope is same as tecnosky one

lunt 50 mod is really easy it is a M68 screw same as the focuser from the scope! You'll immediatly get 95% of the mod.

Next if you want to change lunt focuser and get perfectly same distance between focus point and filter, you'll need some specific adapter.

I could comare visually this mod with 8" HAT : my "cheap" mod was impressive!
Cool. I have save for a TS telescope I do need to buy it.

About the focuser for the Lunt. Which focuser are you using?
Can you post more pictures from your mod?

I'm really interested because my last PST mod was a disaster and I ended mess up the etalon.

I don't have a internal ERF but I have a 100mm ERF.

Also I notice that in your picture you using a Coronado blocking filter.

Please let me know if you can post more pictures and if you can add more specs on the focuser and the mod. I'm drying to do a mod that actually woks for me.

Thank you

Re: lunt 50 mod

Posted: Sun Oct 29, 2017 5:56 pm
by aboy
marktownley wrote:
Fri Oct 27, 2017 8:46 pm
Hmmm. M68 on the lunt 50. That does make things interesting in the mod department...
I'm sorry.

What do you mean with that?

Re: lunt 50 mod

Posted: Sun Oct 29, 2017 6:06 pm
by marktownley
There are lots of M68 adapters available...

https://www.teleskop-express.de/shop/ad ... /OK/page/1

Re: lunt 50 mod

Posted: Sun Oct 29, 2017 6:30 pm
by aboy
marktownley wrote:
Sun Oct 29, 2017 6:06 pm
There are lots of M68 adapters available...

https://www.teleskop-express.de/shop/ad ... /OK/page/1
Thanks

Re: lunt 50 mod

Posted: Thu Nov 02, 2017 8:44 am
by DSobserver
Hello

For me bf10 or 15 are clearly the best ones on the market : brightness and contrast

Regarding Focuser for me Lunt hélicoïdal Focuser is a real Che..

I had a Jim motor Focuser at home and asked for an adapter

In your case I wouldn’t focus to much on this part of my mod otherwise you can go for this one :
https://luntsolarsystems.com/product/1- ... h-focuser/

Again it’s the most important easiest mod : unscrew ref Lunt filter and screw it on ts scope at minimum focus point = done!

Regarding erf I fix it in the Focuser tube
You’ll easily find on solarchat how to fix yours!

I ve no access to my scope for the moment....

Re: lunt 50 mod

Posted: Sun Nov 12, 2017 4:52 am
by marktownley
I've just got a Lunt50 myself - no plans to mod it at this stage, just full disks, but to add to the discussion, the thread size at the focuser side of the Lunt etalon is the same as that on the back of the Daystar Quark, so there are plenty of off the shelf adapters (eg this one http://astrograph.net/epages/www_astrog ... ts/AGRAQT2 ) to get a T2 fitting for various connection options...

Re: lunt 50 mod

Posted: Sun Nov 12, 2017 6:56 pm
by DSobserver
good info!!!

Re: lunt 50 mod

Posted: Wed Nov 22, 2017 5:50 pm
by aboy
Thank you guys.

I will start to buying the refractor maybe my next month and the other stuff I need and for last the 50mm Lunt.

I will let you know guys.

Re: lunt 50 mod

Posted: Thu Jun 21, 2018 8:48 pm
by paulf
Hi, new to the forum and solar imaging! I’ve got Lunt LS50THA with B600. Just checking I understand this thread, if I had a 152mm refractor then it is possible to remove the objective and tube from LS50, screw directly into the refractor focuser, install an ERF, and then I’m good to go? Or would there be other upgrades needed, like moving to B1200.

Re: lunt 50 mod

Posted: Thu Jun 21, 2018 9:47 pm
by marktownley
Valery wrote:
Wed Apr 12, 2017 8:20 pm
The sweet spot size should be about the same as with a PST Mod-2. Both etalons are air-spaced and both have the same working diameter - 20mm. The only advantage is the possibility to move the CWL of the etalon to blue and red wings.


Valery
Very true Valery. I think I will give my lunt50 etalon unit on the back of the HaT, it should just screw on with the correct adaptor.

Re: lunt 50 mod

Posted: Fri Jun 22, 2018 3:01 am
by Valery
marktownley wrote:
Thu Jun 21, 2018 9:47 pm
Valery wrote:
Wed Apr 12, 2017 8:20 pm
The sweet spot size should be about the same as with a PST Mod-2. Both etalons are air-spaced and both have the same working diameter - 20mm. The only advantage is the possibility to move the CWL of the etalon to blue and red wings.


Valery
Very true Valery. I think I will give my lunt50 etalon unit on the back of the HaT, it should just screw on with the correct adaptor.
Which etalon did you mean? LS50FHa? or from the LS50THa ?

Re: lunt 50 mod

Posted: Fri Jun 22, 2018 5:35 am
by marktownley
The pressure tuned module from the lunt50 telescope - use it in a collimated beam.

Re: lunt 50 mod

Posted: Fri Jun 29, 2018 3:09 pm
by DSobserver
paulf wrote:
Thu Jun 21, 2018 8:48 pm
Hi, new to the forum and solar imaging! I’ve got Lunt LS50THA with B600. Just checking I understand this thread, if I had a 152mm refractor then it is possible to remove the objective and tube from LS50, screw directly into the refractor focuser, install an ERF, and then I’m good to go? Or would there be other upgrades needed, like moving to B1200.
Basically yes but all depends on what scope you are talking about!
Larger bf would be better
Prefer coronado 10 or 15

Re: lunt 50 mod

Posted: Sun Jul 01, 2018 9:47 pm
by paulf
DSobserver wrote:
Fri Jun 29, 2018 3:09 pm
paulf wrote:
Thu Jun 21, 2018 8:48 pm
Hi, new to the forum and solar imaging! I’ve got Lunt LS50THA with B600. Just checking I understand this thread, if I had a 152mm refractor then it is possible to remove the objective and tube from LS50, screw directly into the refractor focuser, install an ERF, and then I’m good to go? Or would there be other upgrades needed, like moving to B1200.
Basically yes but all depends on what scope you are talking about!
Larger bf would be better
Prefer coronado 10 or 15
Thanks for reply, don’t have a refractor as yet, but just thinking ahead.