Thanks, I am very interested to see more info on this. I too am quite interested in adding the Baader 1.25x GPC and how it can be easily added to the imaging train to operate a 150mm F10 option from time to time. Especially from a thermal handling standpoint, as my 120mm F10 version handles the heat...

Just looking at the stacked RAW, I knew it would process up to a workable image. Seeing conditions were clearly pretty good to me just seeing the RAW. When I see fairly smooth, high contrast edges on spicules, seeing is pretty much good. So processing this took very little effort, but that's because...

Heya, I use a 150mm F8 Refractor ans mask it to 120mm F10 and it works excellent. I extend my collimating lens forward with extensions rather than cut the OTA (and I can extend it any amount with simple 2" extensions) so that none of the heat is hitting the etalon, instead, it's just hitting the fro...

Super rain!

Very best,

My proprietary image processing. Diffraction limit has been reached. All these graphs about Strehl of SCT are good, but the reality is a bit different and this gives us a hope that some other solar imagers will be able to take same or better images than I was able to take. Hello Valery, I would cer...

Thanks all, :bow Do you still use your ASI174mm camera, it had this strange effect on the image at certain gains. How do you include the images in your post? I don't have a paid astrobin account. Do you use Flickr or another posting site. Hi Magnus, I still use the ASI174MM (IMX174 sensor) camera. M...

Super!

Great discs!
Great moon!
Great Cranes!

Very best,

Heya, It was cloudy and not nice outside this morning so I missed the window to use finer scales, but later in the afternoon the sky cleared up, but I was greeted with lousy seeing. Still, 120mm aperture at 656nm tends to work out even when my seeing is poor. So I managed to get some data on two ver...

I recently contacted i-star optical about measurements like this for their large achromatic doublet lenses and the owner replied that they don't bother measuring down to that nor look at it for correction at all. Without going with a specific well figured mirror (non-SCT though), especially a longer...

I don't think it will hit 0.9 without stopping it down heavily, if ever really. There are things you can do such as make or get things that undercorrect to improve this. More information on making an undercorrector here: https://solarchatforum.com/viewtopic.php?f=10&t=25125&start=25#p239889 While th...

Heya, My understanding is It can be made to work, a user on this forum did (was it Jozef?). Remove the blocking filter from one of them. The main issue is transmission, it will be quite low, a dim image, so will require a lot of gain, which destroys high resolution opportunity. Here it is: https://s...

Thanks all,

That big prom is gone now apparently, now that I have another day off. Sigh!

Very best,

Next I want to mod the new 10mm blocking filter to also be straight through to eliminate that mirror being in the imaging train. With the Coronado BF's, the part with the valuable BF is not threaded, it is just glued to the bottom of the eyepiece holder. First remove the BF itself. Then use heat to...

Heya, It's rained the past few days, lots of storms, a weird wet October so far here in Florida. But this morning was improved, had a clear sky this morning around 10am and pretty good seeing, so I was able to get some high resolution data of a few features, despite there being very little going on,...

Do you consider is there is any particular advantage to stopping down the objective? Reduced internal heating perhaps? Stray light reduction? An internal D-ERF can/should only be placed where the F/8 light cone falls within its clear aperture. Too near the objective and the light cone will heat the...

Pretty cool Phil, and good details are definitely seen! I think you have it dialed in as much as it can be.

Very best,

(By the way, I noticed Baader has a disclaimer never to use their 35nm as an internal ERF, not that they say it will fail.) I think, with 99.9% certainty, this is to prevent someone from pointing this filter, at focus, at the sun as a stand alone "Ha" filter thinking it's meant for that and not jus...

solarchatted wrote: ↑

Sun Oct 06, 2019 2:03 pm

But USB2 or USB3 ?

USB2 version maxes out at 20FPS full pixel array.
USB3 version maxes out at 82FPS (12bit), 170FPS (10bit).
I wouldn't even consider a USB2 interface speed for imaging anything more than course scale, full disc FOV.

Very best,

Heya, A clear sky and some ok seeing this morning. Was able to take a look in fine image scale at AR2749, which is already decaying away with barely a visible umbra in the photosphere and really only remarkable in the chromosphere with the plage and mottling around it. There's also a fairly nice bri...

Lovely disc Brian!

Very best,

Looks great Ken!

Very best,

I tested the Coronado BF15 mirror with the spectrograph some time ago and found as you say it's a IR reject mirror. For the 10mm blocking filter, will you skip whatever the mirror is accomplishing? I am guessing it is redundant with your red CCD filter. E.g., in current Lunts, it passes IR out the ...

Later this evening, this minor flaring in a tiny active region popped up, around 1730 Eastern Time: https://live.staticflickr.com/65535/48824288922_b85037ab0d.jpg https://live.staticflickr.com/65535/48824289242_b81998c20a_c.jpg https://live.staticflickr.com/65535/48824289557_505fd71746_c.jpg Very be...

Heya, Late this evening the small bright prominence on the West limb lifted off and became enormous (1730 Eastern Time). It's still present even now but it has spread out and gotten fainter. I managed to get some tolerable data in poor seeing late evening after a few attempts. Lovely huge prominence...

I'm not entirely certain; I'm curious if a double stack intended etalon has higher transmission (the ones labeled "must be used with another... blah blah"). With the internal Lunt DS options, they don't have ERFs, just the etalon, so you can control as much as possible that way. The front mounted op...