Merlin66

Just checked the Jeulin site: https://en.jeulin.fr/simple-radial-slits-212076.html That's what your looking for.

Louise, My mate Fulvio has noted in his Spec 600 write up (http://www.lightfrominfinity.org/Spec 600UP and Spec600 EVO/Spec 600 UP e Spec 600 EVO.pdf) ""However, the Ovio has recently been incorporated into the French firm Jeulin, so it will be necessary to contact this last company to acquire the multi-slit plate, that actually is sold in bundle with three others plates, that don’t have interest for our purposes, or in a kit of two slit plates.It will be necessary to ask the Company to sell the multi slit plate only. https://en.jeulin.fr/en-products/physics-chemistry/optics/optical-components-commonequipment. html""

No, weiller’s CORONO software. A bit difficult on the iPad to find the link, but Google will have it. http://sweiller.free.fr/Softwares/Corono/corono.html

Look at Corono to give a black disk to enhance your proms. Recommended.

I use EQMOD on both my HEQ5 and NEQ6PRO with CdC and PHD2. I still use the ST-4 cable for guiding (C11@f10). Why? It works well for me, why change?

I use an ASI 174 and ASI 1600 for solar imaging with my SM60/ED80, x2.5 PM. I work at Unity gain (174 = 189 gain, 1600 = 139 gain) and Gamma = 50. I never touch these again. Using the exposure I push to get the histogram up to around the 90% mark....... For proms, I leave the Gain and Gamma untouched but push the exposure to show the prom.....maybe, just maybe, for the fainter proms I'll push the Gain a few points......

Matt, Well done, looking better.

Matt, A bit over cooked...the actual surface is smoother and more flowing......ease off the wavelets and contrast. Just my 2c.

The #7315 1.25” non rotating helical is $99.....

The Borg 1.25” version of the helical focuser works well. I use it on PST mods, the Spectra-L200 and the spectroheliograph.

I've been using the ASI 174 mm for a while now (definitely needs the T2 tilter) -would work well for you - fast frame rates.... I wanted to get a better FOV and went for a ASI 183mm, BUT it turned out not to be suitable for solar Ha imaging (!!!!) replaced by ZWO, and I went for the ASI 1600mm uncooled. Just my 2c

I added a SW electronic focus motor to all my solar scopes...... This allows you to comfortably concentrate on the image while tweaking the focus.

Louise, You'll find in normal usage that the Hi-res, limited wavelength, is used to record specific detail at nominated target wavelengths - Ha, Hb or some other target. Generally there's no need to combine them.

Louise, Yes, you can combine spectral profiles to present a larger coverage - BASS can do this .

I believe the finished spectrograph is around 1Kg, you then need to add the guide camera and the imaging camera. I would work on 1.7 to 2Kg loading on your telescope/ focuser.

Louise, I have entered the LowSpec design into the SimSpec spreadsheet, if you use the data you have it should give you a reasonable first approx of the capabilities and spectral coverage. SimSpec V4.3_Paul3D.zip

IMHO, a 600 l/mm grating would be a good compromise. You can always change it later when you gain more experience. Have you decided on what cameras you'll use? Guiding and acquisition?

Buil's Vega atlas provides a very good reference source for these Atmospheric bands..... http://www.astrosurf.com/buil/us/vatlas/vatlas.htm See also the links given here: http://www.astronomicalspectroscopy.com/process.html

Louise, Ah, I see you're calling up a 6mm thick grating....I always used the 9.5mm.... Ken

Andrew, Looks like you're off to a good start! Ken

Louise, Surplus Shed don't supply gratings... I thought Paul's LowSpec required a 600 l/mm grating? I buy all my gratings from Optometrics (now Dynasil) - highly recommended. Ken

Vlaiv, The bottom Rochi definitely shows "wavy" lines........

Chris, Neat and functional, I would say. It obviously does the job. Well done! I was lucky to find a 100mm diameter FS5 20 deg prism and mounted it into a PVC joiner, see images. It's a bit difficult to see as the prism doesn't show up too well. This is then mounted on the ED80. I also, like you, use an off-set finder. Ken

No, not easily. The tube has to be cut then you need to manufacture an adaptor to hold a new prism assembly. Much easier to find a s/h RACI version.

Nigella, https://solarchatforum.com/ Look in the Solar Scope mods section. There are a few members using the Quark as a double stack.