Very interesting Mark, thanks for the update
Please keep us posted. I have some bad experiences with double stack etalons...
Thermal Acclimation of My Lunt50
- pedro
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Re: Thermal Acclimation of My Lunt50
Hi Mark,
Interesting and good animation.
Rainer
Interesting and good animation.
Rainer
regards Rainer
Observatorio Real de 14
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North 22° West 101°
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Re: Thermal Acclimation of My Lunt50
The more I experiment with this scope the more i'm convinced the etalon sits loose in the chamber it is housed in. You can definitely hear a 'moving part' in the etalon chamber and it can only be the etalon. The fact I can get the sweetspot as a band implies the etalon is tilted relative to the normal. The fact that I can alter the relative tuning by the angle the scope sits at - ie rotating it in the tube rings just screams loose etalon sitting in the chamber.
I couldn't get it uniformly on band at all this evening and was saying lots of bad words. I did try triple stacking it with another 50mm etalon with results below.
HA-fd-ts-bw by Mark Townley, on Flickr
Not even.
I'm now exploring a few options here, as in it's current form this pressure tuned Lunt simply does not do it for me - too much faffing around to make it work. Firstly disassemble, reassemble and diagnose the LS50 to see what can be improved. Secondly looking at LS50 etalons with a view to double stacking with external etalons for more even larger sweetspot - 50mm etalons are pretty cheap at the moment so I think I will do Valerys trick and shop around for the best ones.
I couldn't get it uniformly on band at all this evening and was saying lots of bad words. I did try triple stacking it with another 50mm etalon with results below.
HA-fd-ts-bw by Mark Townley, on Flickr
Not even.
I'm now exploring a few options here, as in it's current form this pressure tuned Lunt simply does not do it for me - too much faffing around to make it work. Firstly disassemble, reassemble and diagnose the LS50 to see what can be improved. Secondly looking at LS50 etalons with a view to double stacking with external etalons for more even larger sweetspot - 50mm etalons are pretty cheap at the moment so I think I will do Valerys trick and shop around for the best ones.
http://brierleyhillsolar.blogspot.co.uk/
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Re: Thermal Acclimation of My Lunt50
I got the lens spanner out last night and tightened down the cell on the ERF, so will see if that helps.
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Re: Thermal Acclimation of My Lunt50
Looks to have great contrast when stabilized Mark. excellent imaging BTW!
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Re: Thermal Acclimation of My Lunt50
Makes sense. This is why the etalon is flopping around...
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Re: Thermal Acclimation of My Lunt50
Next steps with this, the etalon chamber is coming apart and i'm going to do a rebuild / re-engineer as needed.
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!