Ha FD, 29/7/2021 - Lunt 50 vs Lunt 60

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davidem27
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Ha FD, 29/7/2021 - Lunt 50 vs Lunt 60

Post by davidem27 »

Hello folks,
A friend of mine borrowed me his Lunt 60 and I wanted to try differences with mine 50mm model.

This is the result, quite impressive the difference, to me.

Maybe with 60mm I spotted the CWL better than with the 50.

What do you think about this comparation? What are the differences your eyes pick up from the two pictures?
I'd glad to hear your opinions.
Thanks everybody

Please open the image in another window to see in full resolution
Attachments
2021-07-29-Lunt60-vs-Lunt50.jpg
2021-07-29-Lunt60-vs-Lunt50.jpg (1.46 MiB) Viewed 476 times


White light: Skywatcher 120 ED and Borg 76 ED with Baader Herschel Wedge and filters
H-alpha: Lunt LS50T Ha BF600, 120 ED modified by Lunt etalon. Thousand Oaks 0.9 Å Prominance filter
Calcium II K: Lunt B1200

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Re: Ha FD, 29/7/2021 - Lunt 50 vs Lunt 60

Post by EGRAY_OBSERVATORY »

Hello Davide,
Both scopes have produced an excellent FD-image - importantly using the same camera.

The left/60mm image is marginally better than the 50mm assuming that the Etalon's are tuned for the very best/sweet-spot.

Logically the Lunt 60mm will be better than the LS-50, but not always...

Terry (LS60 + DS owner for over 10-years)


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Re: Ha FD, 29/7/2021 - Lunt 50 vs Lunt 60

Post by marktownley »

That's a nice comparison, thanks for sharing!


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Re: Ha FD, 29/7/2021 - Lunt 50 vs Lunt 60

Post by MAURITS »

I like this comparation, the Lunt 60 is much more expensive than the Lunt 50, but the images are that not, they are very close in details.
Of cource the Lunt 60 is the winner.
Last edited by MAURITS on Fri Jul 30, 2021 11:19 am, edited 1 time in total.


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Re: Ha FD, 29/7/2021 - Lunt 50 vs Lunt 60

Post by davidem27 »

Maybe there is an element that do not play a good role in favour of the resolution comparisation topic: the sampling.
We know that correct sampling for 2.4 pixel size is f/9 for 656.3nm wavelength

Lunt 60 is nearer than 50 for correct sampling: f/8.3 vs f/7

(I love the Lunt 60 much more than my little 50...)


White light: Skywatcher 120 ED and Borg 76 ED with Baader Herschel Wedge and filters
H-alpha: Lunt LS50T Ha BF600, 120 ED modified by Lunt etalon. Thousand Oaks 0.9 Å Prominance filter
Calcium II K: Lunt B1200

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Re: Ha FD, 29/7/2021 - Lunt 50 vs Lunt 60

Post by EGRAY_OBSERVATORY »

Maurits has reminded me of the price-difference between the two and as usual the price often dictates the quality.

Now that there is a Lunt-40mm Ha and up to a 300mm version, one wonders what can come next, but the Bank-buster version requires a little more than just money to get it worthwhile running - as a lot less cloud and bad-atmospheric conditions, not too mention a decent tracking mount...

This reminds me of a previous topic - which has now re-surfaced today...

Terry


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Re: Ha FD, 29/7/2021 - Lunt 50 vs Lunt 60

Post by Montana »

I think both images are very good indeed, obviously the 60mm is better than the 50mm but I would be very happy with either :) Also, etalons vary between each other. I bet you would get a different result again if you tested one 60mm with another 60mm ;)

Alexandra


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Re: Ha FD, 29/7/2021 - Lunt 50 vs Lunt 60

Post by VasilevIvan »

Nice shots and comparison, Davide! It would be also interesting to compare Lunt 80 and Lunt 60 for the full disk.

Ivan V.


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Re: Ha FD, 29/7/2021 - Lunt 50 vs Lunt 60

Post by DeepSolar64 »

I would love to have even the Lunt 50!


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Re: Ha FD, 29/7/2021 - Lunt 50 vs Lunt 60

Post by davidem27 »

Thank you all for the replies!

I scaled the take made with Lunt 60 to compare the details among both takes.

Are details sharper in 60mm than in 50mm for more precise focus or just for the sake of resolution reached by sampling?
Attachments
2021-07-29-Lunt60-vs-Lunt50-COL-pari.jpg
2021-07-29-Lunt60-vs-Lunt50-COL-pari.jpg (1.47 MiB) Viewed 396 times


White light: Skywatcher 120 ED and Borg 76 ED with Baader Herschel Wedge and filters
H-alpha: Lunt LS50T Ha BF600, 120 ED modified by Lunt etalon. Thousand Oaks 0.9 Å Prominance filter
Calcium II K: Lunt B1200

www.volpetta.com

We are curious. We need equipment, we need seeing, we need time
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