my little lunt60 mod

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swisswalter
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Re: my little lunt60 mod

Post by swisswalter » Wed Jun 04, 2014 4:07 am

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 » Fri Jun 06, 2014 10:27 pm

lunt75ss.jpg
lunt75ss.jpg (106.51 KiB) Viewed 2661 times
some more test first with .60 reducer

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Re: my little lunt60 mod

Post by highfnum » Fri Jun 06, 2014 10:29 pm

with TV 2.5 barlow

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

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Re: my little lunt60 mod

Post by highfnum » Fri Jun 06, 2014 10:29 pm

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

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Re: my little lunt60 mod

Post by marktownley » Sat Jun 07, 2014 5:17 am

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 » Sat Jun 07, 2014 1:54 pm

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 » Sun Jun 08, 2014 8:47 pm

Great results from the modded scope!!!

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Re: my little lunt60 mod

Post by vikeljay » Sat Jun 14, 2014 12:25 pm

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 » Mon Jun 16, 2014 10:46 pm

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 » Sat Jun 28, 2014 11:06 am

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 » Sat Jun 28, 2014 2:20 pm

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 » Sun Jun 29, 2014 7:19 pm

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 » Sun Jun 29, 2014 7:22 pm

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 » Sun Jun 29, 2014 9:49 pm

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 » Sun Jun 29, 2014 9:55 pm

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

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Re: my little lunt60 mod

Post by ForrestLockhart » Fri Jul 04, 2014 9:55 pm

Hi John,
How does the lens setup perform visually?
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Re: my little lunt60 mod

Post by highfnum » Sat Jul 05, 2014 4:04 pm

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 » Sat Jul 05, 2014 4:05 pm

one more shot
90mlensto83b.jpg

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Re: my little lunt60 mod

Post by highfnum » Sat Jul 05, 2014 4:08 pm

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 » Sat Jul 05, 2014 4:10 pm

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 » Sat Jul 05, 2014 4:19 pm

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 » Wed Nov 30, 2016 6:11 pm

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 » Sat Dec 03, 2016 11:23 pm

try to stay within original f num give 10 pct

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Re: my little lunt60 mod

Post by soulvagabond » Mon Dec 05, 2016 11:44 am

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 » Mon Dec 05, 2016 12:33 pm

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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