my little lunt60 mod

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my little lunt60 mod

Post by highfnum »

luntchimd.jpg
luntchimd.jpg (154.06 KiB) Viewed 7768 times
take lunt 60 and unscrew front 60mm lens assembly
then insert a 75 mm by 250 mm plano convex lens 20mm closer to etalon


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Re: my little lunt60 mod

Post by highfnum »

inserted.jpg
inserted.jpg (163.73 KiB) Viewed 7767 times
push down to proper place


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Re: my little lunt60 mod

Post by highfnum »

luntchfin.jpg
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place 75 ERF in front to prevent extra heat and tone down brightness


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Re: my little lunt60 mod

Post by highfnum »

lunt75.jpg
lunt75.jpg (165.54 KiB) Viewed 7767 times
here is some pics of result --plz excuse pollen dust on lens - its that time of year

image of sun is slighty smaller - but brighter and can use barlow

not sure of gain in doing this - but i could so I did


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Re: my little lunt60 mod

Post by highfnum »

fc2_save_2014-06-01-185142-0000lunt75.jpg
new image size


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Re: my little lunt60 mod

Post by swisswalter »

Hi John

a wild mod. Seems to work


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 marktownley »

Cool stuff! :)


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Re: my little lunt60 mod

Post by GUS »

Hi John,interesting mod,also noticed the shoelace tied to the BF,which I figure is tied off to the focusing tube to stop the BF from sliding out(something so simple)Good idea.


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Re: my little lunt60 mod

Post by swisswalter »

Hi GUS

eagle eyes ;)


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 GUS »

Hi Walter, having a Lunt scope myself I know how easily the BF can slip out of the focuser tube,but never considered any fix for it until I noticed johns solution(and so simple).

GUS


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Re: my little lunt60 mod

Post by swisswalter »

:bow2 GUS some times less is more


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 »

string1.jpg
string1.jpg (161.59 KiB) Viewed 7725 times
funny i show how to convert 60mm to 75mm scope for 240$
and everyone is thrilled over a 25 cent shoelace
so..
here is shoelace mod


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Re: my little lunt60 mod

Post by highfnum »

string2.jpg
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and here is test :D


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Re: my little lunt60 mod

Post by swisswalter »

Hi John

thanks for the close up of the shoelace


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 GUS »

Hi John,I was actually zooming in on the solar finder (another neat and simple solution),when I noticed the shoe lace. I usually scan around mod photos to get ideas ,and sometimes you come across something, and think to your self why didn"t I think of it, and yes Walter sometimes less is more.
On another note, how does the mod work visually,and where did you get the lens from.
Thanks
GUS


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Re: my little lunt60 mod

Post by highfnum »

Sun finder made from aluminum
stock
but my cool idea at back
there is a small cut and polished diamond
that glint when light hits it


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Re: my little lunt60 mod

Post by highfnum »

I got lens from Edmund


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Re: my little lunt60 mod

Post by GUS »

HI John,LOL,but seriously how does it compare visually to the 60mm lens.

Thanks GUS.


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Re: my little lunt60 mod

Post by swisswalter »

highfnum wrote:Sun finder made from aluminum
stock
but my cool idea at back
there is a small cut and polished diamond
that glint when light hits it

Hi John

a very interesting idea with the diamond. What size of diamond do you need?


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 »

1/10 carat or less
smaller in this case is better more accurate locator
round cut and polished not rough
NYC is big diamond district
you can get for 5 to ten dollars
smaller is more accurate


Big diamonds are for the women!


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Re: my little lunt60 mod

Post by highfnum »

One hard thing is mounting
try not to get glue in front of diamond
will make dull and defeat purpose


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Re: my little lunt60 mod

Post by swisswalter »

Hi John

thank you very much. I'll get one and will report. Maybe you have come up with a wonderful new solarsearcher idea


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 »

Also notice
distance to fron those is short
smaller image more accurate


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Re: my little lunt60 mod

Post by swisswalter »

Hi John

I will remember ;)


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 »

Walter
diamond is 1mm to two millimeter diameter
1mm is 0.01 carats
real small

Not 1/10


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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
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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!


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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

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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
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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
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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
90mms.jpg (177.61 KiB) Viewed 6493 times


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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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