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Here are some extractions with Jhelioviewer, from SDO AIA data base in 304 Å

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Here are some extractions with Jhelioviewer, from SDO AIA data base in 304 Å

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Great shot Paul! Thank !

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Great shot Paul! Thank !

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Very nice animation and pict Paul! You might need a bigger sensor for the next bigger prom

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Thank you solarchaters, hope solar min is behind.

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Hi
Had a glance at it yesterday 13, but didn't have the time to catch it today. It was bigger (1/5 of the sun) but weaker today, and better with the étalon de tuned (lower pressure). Lunt 100 with 18mm eyepiece, still between cirrus

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And the mount...

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From lunt years ago https://luntsolarsystems.com/limited-run/ Lunt is pleased to announce the next run of LS230T/B3400/PT Solar Systems. This run will be limited to 10 instruments. However, we are excited to be offering these systems as the Double Stack version with dual USB/PC Pressure Tune control...

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Thank you very much for your kind comments!

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Thanks to observers from this group, I took some time to observe it before going to work (LS100Tha):

: 201709110840_lunt100_2.jpg (39.17 KiB) Viewed 1709 times

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Great setup and picts!!!!! What etalon system do you use? To improve local seeing, I would cover everything that is black: - the rings: they catch heat and transmit it through the tube causing internal local air current (I have some at night on my C8 due to the cooling of the rail on the side...) - ...

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Impressive!!!

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Hi Merlin, never saw one, but found some infos on CN: https://www.cloudynights.com/topic/260382-criterion-solar-prominence-viewer/ Never did it myself, but I have seen solar projection with Schmidt cassegrain in those time, so dangerous for many reasons. Is it this add? (thanks waybak machine) crite...

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That's very nice with a very good resolution !!!! Wich size of ERF do you use?

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That's cool!!!

Do you have some images taken with it?

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Same as Pedro ans Eric, twiking BF vs étalon orientation . ;) you can check collimation in Ha with a pin hole on an aluminium foil un front of a broadband light source as hallogen far, by night. ;) If collim is OK, something on the etalon cell might be too much tilted. Lunt might help you then (they...

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Great!! are they from the filaments seen before?

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Thank you Franco and Montana. Sketching in 10 to 20min is a lazy way for me to avoid setting up the equatorial mount/cam/computer, and still keeping an eye on the sun to get a good resolution

Cheers from Paris

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Hi, just a sketch from last saturday. Seeing was good and there was a prom!! With Lunt 100 THa simple stack: https://lh3.googleusercontent.com/2_cz8TkH0DgeEeKtPfv_u0fy6FEg0ocv0rayQRT50b808UZVsRRsjB4FlG24YLor6L8_tNqbRhNUFVt78JIbVeaqBCwWI3UVm49_w3rBohSaC6zdPVs8DFe2MmSJP_vmkGA0zGPrZ3xrDrmdi8g10Tj_se1LM...

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Excellent images. Hope one day I can directely observe un such a telescope

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Sounds interesting but the picts are invisible for me

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Still looking for an internal double stack module DSI for a Lunt 100mm. Would travel through EU to receipt it

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Nice project!!! Given your low latitude, why not using an equatorial plateform combined with Dobson mount? It's easy to make from wood, Footprint is less, weight also, no vibration from the fork,....

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I do the same with the LS100 since 2009

in order to nearly equilibrate and stress less the plumping/joints if there are some

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Impressive ans nice!!! Maybe if you have room and 2 diagonals, you can fold back the lightpath, making a U with it and get the Quark at the focuser level

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That's interesting George and Gus!

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Yes Walter was right also with the warm up time (15' to 30'). By the way, the first version of the LS 100 (the one with black lens cell and F/8 achromat lens) wasn't as good as the current version (red lens cell an ED F/100 lens). Which version do you have with which BF? I ask you this because it ap...

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Hi Mike, is jour ITF OK? I can get sharp and images with my LS100 with cirrus.

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Hi,

I'm looking for a DSII module for LuntTHa100, would prefer in EU.

Thankx

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Cool mod!!!

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Do you have the price for a C8?

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The front black parts can increase instrumental turbulence:
-secondary holder
-front black outer part of the tube
The mount/pier also as heat waves go up.
white painting/white coton shreds ?

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As the gost doesn't turn with the DS module, did you try to test the influence of the BF filter orientations ? We tried several BF orientations on several scopes (Lunt100+BF3400, Lunt100+BF600, Front coronado+BF3000) and there was an optimal orientation for optimizing the resulting bandwidth.

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Very nice picts, I'm impatient to see picts with a good seeing. Cheers for jour new setup

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Thanks for the pic and the info!!!! Still there

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Great setup!!! So you have the double stack with one filter in double pass too? not trisky with ghosts?

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Thank you Valery. I wish one day I could observe the sun in one of your setup. Were you in french ROS meeting at Serbanne this year?

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Hi Valéry, both are excellent !! Wondering about the SS image: as much more black and white zones are saturated, it seems that prior camera, the optical image seems to have a wider dynamical range in SS mode than in DS mode, as if you had a better optical contrast in SS mode (Hence HDR to catch all ...

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Fantastic work!! great to see that, I will look the penumbra with a new eye

. And thank you very much for the article link.
Still hope to see/catch some Moreton waves

Cheers from sunny France

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Some very interesting references if you want some clues about optimizing positions/sub apertures: http://www.rop.cnrs.fr/IMG/pdf/F_Cassaing.pdf https://tel.archives-ouvertes.fr/tel-00140049/document I did the simulations: The five is still better ;) https://lh4.googleusercontent.com/-EM-BtiwT-Bg/VTk...

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Fabulous!!!! Thanks to astrosoleil list alert, I could see it too

Thank you vert much for these fantastic picts.

Cheers

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I could catch it on http://www.knowtex.com/nav/helioviewer- ... tool_35526

Here is the sequence:

https://youtu.be/7pvrA9UoeAg

clear sky

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Seems that the sun is awakening again, so there might be an other chance

BTW the loop was also really nice.

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Great shots with resolution. You catched the end of the coronal ejection on the eastern limb (it was massive 20% sun diameter). Hope someone catched it. I began to draw it, but it was to big fast and changing, I prefered to stay s(t)icked on the eyepiece. It's not easy to catch both ends with one te...

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That's very interesting. It looks that it could be used as a secondary mirror on a Newton too with an adapted holder. Do you think that the coating will tend to age?

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+1 with Valery. Stuff from the same batch. I did some biblio. Here are some interesting simulations optimizing the sub apertures diameters, and relative positions (the 4 subs is interesting) I will run the psf on them when clouds come back ;) I think DSobserver will have some stuff to test on his C1...

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It looks quite good with 5 holes (obstruction is 26%, small diameter is 37% full one), here it is: https://lh4.googleusercontent.com/-lQLoCM3d7RE/VSA1Gq5U8FI/AAAAAAAAQWQ/c1cbuik8140/w1589-h865-no/synthetic_cat_5.jpg The 6 holes version (obstruction is 33%, small diameter hole is 33% the full one): h...

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With the pattern simulated, central obstruction is (2-sqrt(2))/(2+sqrt(2))=17% (if my maths are correct), it would fit tight a newton

Sorry for Cats

5 or 6 holes version for cats?

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Well I think that C.viladrich already more or less answered to my question.... http://www.cloudynights.com/topic/491787-full-aperture-baader-solar-film-on-a-c14/?p=6460933 As it's cloudy, I made some simulations, with a closer spacing than C. viladrich. It's promising resolution wise, even the firs...

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