my little lunt60 mod

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soulvagabond
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Re: my little lunt60 mod

Post by soulvagabond » Mon Dec 05, 2016 1:20 pm

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

highfnum
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Re: my little lunt60 mod

Post by highfnum » Wed Dec 07, 2016 5:44 pm

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

highfnum
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Re: my little lunt60 mod

Post by highfnum » Wed Dec 07, 2016 5:46 pm

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

highfnum
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Re: my little lunt60 mod

Post by highfnum » Wed Dec 07, 2016 6:01 pm

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

soulvagabond
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Re: my little lunt60 mod

Post by soulvagabond » Wed Dec 07, 2016 7:29 pm

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.

highfnum
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Re: my little lunt60 mod

Post by highfnum » Wed Dec 07, 2016 9:24 pm

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

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