my little lunt60 mod

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swisswalter
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Re: my little lunt60 mod

Post by swisswalter »

Hi John

thanks a lot for the size information


Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

from 7 am - 7 pm http://www.nanosys.ch

from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)
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Re: my little lunt60 mod

Post by highfnum »

lunt75ss.jpg
lunt75ss.jpg (106.51 KiB) Viewed 6603 times
some more test first with .60 reducer


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Re: my little lunt60 mod

Post by highfnum »

with TV 2.5 barlow

shows pretty good resolution
Attachments
fc2_save_2014-06-06-171754-000jc0.jpg


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Re: my little lunt60 mod

Post by highfnum »

fc2_save_2014-06-06-171754-000j0.jpg
orig B+W


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Re: my little lunt60 mod

Post by marktownley »

Nice shots with the mod!


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!
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Re: my little lunt60 mod

Post by highfnum »

THX

I like this mod
completely reverseable no change to Lunt scope it self


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Re: my little lunt60 mod

Post by MapleRidge »

Great results from the modded scope!!!

Brian


Brian Colville

Maple Ridge Observatory
Cambray, ON Canada

Photos: https://www.flickr.com/photos/185395281@N08/albums

10'x15 Roll-off Roof Observatory
Takahashi EM400 Mount carrying:
C14 + Lunt 80ED
Deep Sky Work - ASI294MM Pro+EFW 7x36/Canon 60D (Ha mod), ONAG
Planetary Work - SBIG CFW10, ASI462MM

2.2m Diameter Dome
iOptron CEM70G Mount carrying:
Orion EON 130ED, f7 OTA for Day & Night Use
Ha Setup: Lunt LS80PT/LS75FHa/B1200Ha + Home Brew Lunt Double Stack/B1800Ha on the Orion OTA + Daystar Quantum
WL, G-Band & CaK Setup: Lunt Wedge & Lunt B1800CaK, Baader K-Line and Altair 2nm G-Band filter
ASI1600MM, ASI432MM, ASI294MM Pro, ASI174MM, ASI462MM
vikeljay

Re: my little lunt60 mod

Post by vikeljay »

Just what does this mod do? Also, where can I pick up that convex lens? Thanks.
Jim


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Re: my little lunt60 mod

Post by highfnum »

I got mine at Edmund optics
I bet If I tried I could have found one for less money


Reason for Mod
My idea was to get more resolution 60mm vs 75 mm out of same scope
second slightly faster f ratio for brighter image so when I use Barlow I got more light to work with

and do it so it was reversible without changing original spec of scope


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Re: my little lunt60 mod

Post by highfnum »

i tried this mod with cheap 4 dollar lens to see if
results would equal 80 dollar lens

forget it

disk had poor detail

i got
one more
90 by 300 mm

ill get back


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Re: my little lunt60 mod

Post by swisswalter »

Hi John

good luck, we are expecting results asap ;)


Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

from 7 am - 7 pm http://www.nanosys.ch

from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)
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Re: my little lunt60 mod

Post by highfnum »

ok I did preliminary test with 90 X 300 mm lens
I used tape and foam rubber for now i cant promise lens was optically square
but initial l test look good

here is first shot
fc2_save_2014-06-29-142457-0000b.jpg


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Re: my little lunt60 mod

Post by highfnum »

lens position is critical to get sharp image
Im to close to etalon as you can see
I had to add 2 tubes to get to focus

but I will build proper lens mount and fins its proper position (I hope ;)
90l.jpg
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Re: my little lunt60 mod

Post by swisswalter »

Hi John

yes it is all about sharpness and contrast dealing with distances. Good luck


Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

from 7 am - 7 pm http://www.nanosys.ch

from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)
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Re: my little lunt60 mod

Post by highfnum »

so far first mod is best - 75mm by 250
I guess the 80 dollar lens was worth the money


ForrestLockhart

Re: my little lunt60 mod

Post by ForrestLockhart »

Hi John,
How does the lens setup perform visually?
Forrest


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Re: my little lunt60 mod

Post by highfnum »

75mm (edmund) lens works just fine visually
a litter brighter

OK

i tried with 90mm lens and changed position
also cut lens down to 83mm
I also changed position
and got what I consider second best results
75mm is still sharper

but 30 dollar lens did OK see for yourself
90mmlensto83.jpg


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Re: my little lunt60 mod

Post by highfnum »

one more shot
90mlensto83b.jpg


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Re: my little lunt60 mod

Post by highfnum »

above shots - no barlow

I did need (1) 4 inch extension tube due to longer focus
so here is my final config for this mod is a get a better quality lens then ill flip it
90mms.jpg
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Re: my little lunt60 mod

Post by highfnum »

one more thing notice my june 28 shot was much softer before final changes
position is critical
and quality of lens (DUH :D )


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Re: my little lunt60 mod

Post by highfnum »

to JIM
I used edmund part # 63495 Lens PCX 75 X 250 MGF2 CTD

the 90 I gotta find papers I know its 90 X 300

all millimeters


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Re: my little lunt60 mod

Post by soulvagabond »

Seems like a good looking and cheap mod.
I will probably be purchasing a lunt ls50 shortly, so really curious, if this upgrade can also be applied. What lens size would be more appropriate, since, LS50 focal ratio is F/7, against 60's f/8.3


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Re: my little lunt60 mod

Post by highfnum »

try to stay within original f num give 10 pct


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Re: my little lunt60 mod

Post by soulvagabond »

Thank you,
I'm a bit confused here, Lunt 60 has native f/8.3 and the convex lens you used is f/ 3.3
What's the logic behind calculating the right lens fot Lunt 50 then?

Please, bear with me, my optical knowledge is pretty vague.


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Re: my little lunt60 mod

Post by highfnum »

Correct lunt has built in telecentric Barlow
Lunt native lens is very short also
If you unscrew it and test you see what I mean


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Re: my little lunt60 mod

Post by soulvagabond »

Thanks again, appreciate your reply.

I actually, do not own the scope yet. The Lunt 50 is arriving to the dealer in about a week, whereas Lunt will be coming 1-2 months later.

I believe, the etalon size is pretty much the same in Lunt 50 and 60, any other possible complications, which could possibly prevent me from getting the similar results using Lunt50, making me to wait for another 2 months and costing me extra $800?

I could not find anywhere, what Barlow Lunts are using (I presume around x2.5), but, if to assume they are the same on 50 and 60, the 75 x 200 convex seems about right with it's f/2.67


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Re: my little lunt60 mod

Post by highfnum »

If remember lunt original lens
Was 60mm by 13 inch fl

Do conversion and divide by 60
Then compare fl to true final fl
That give you Barlow strength


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Re: my little lunt60 mod

Post by highfnum »

Mm maybe I'm wrong it was 9 inch
I'll check at home


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Re: my little lunt60 mod

Post by highfnum »

ok I got now (we crazy Americans with inches and millimeters!) 60 by 260 = f4.3 (aprox) = 8.6 ok some error is possible since I did fl measurement by hand that is close enough - 250 was best I could get for price that's why I had to push it in a bit closer


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Re: my little lunt60 mod

Post by soulvagabond »

Barlow is 2x, I presume then?

Then, it looks like the 75x250 convex lens matches Lunt's 50 F/7 even closer (assuming the fact the same barlow is used in both).
Would be curious to know, if the 50's tube internal diameter is sufficient to be used with the 70mm objective.


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Re: my little lunt60 mod

Post by highfnum »

2x correct.
Second question more important
Lunt 60 tube is about 85mm
Don't know about 50
You got pictures


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