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Alun_H · Re: 19-03-2023 CaK SHG Congratulations on SPOD Rainer,well deserved Alun

Congratulations on SPOD Rainer,well deserved

Alun

Alun_H

Can you tell me what the exposure and gain were for the three wavelengths? I'm curious how much attenuation you get with the Herschel wedge. As you may know, I use my own quartz slits that require only a UV/IR filter so I typically operate near 1ms and zero gain. Checking out the log files for the ...

Alun_H

Superb images Oleg

Alun

Alun_H

Superb images Clare & Peter.

Alun

Alun_H

Fantastic white light image Nic.

In regards the Evostar 80 dew shield,I found this review of the scope https://astrofarsography.com/skywatcher ... 0ed-review and the reviewer states that the objective lens is supported within the dew shield rather than the tube so isn't removable.

Alun

Alun_H

Montana wrote: ↑Mon Mar 20, 2023 7:35 am These are fabulous images Alun, are these single frame images or do you stack a couple like Douglas?

Thank you Alexandra,these are all single frames with minimal processing (brightness levels).

Alun

Alun_H

Yes, I think it's possible. I know of at least one person, Brian Martin in Canada, who has done this: Thank you for the links Douglas and confirming that your slit can fit,I will look into getting a suitable attachment sorted,I don't have a 3D printer but can no doubt come up with something,as soon...

Alun_H

Thank you Rainer,Douglas The Sol'Ex collimator and slit are focused by firstly focusing the camera/lens assembly to infinity,replacing them back into the Sol'Ex body then watching the live feed on screen the focus of the slit collimator is adjusted by sliding the block supporting the slit,which I do...

Alun_H

Thank you Rainer. I forgot to add this little gif of one of the scans I recorded in the Halpha wavelength on the 17th at the time a flare (or some activity) was in progress around sunspot AR3256. Scan is cropped to the specific part of the scan area to cut down file size. Cloud drifted through whils...

Alun_H

Superb images Martin.

Alun

Alun_H

Fantastic images with the PST Alexandra

Alun

Alun_H · Re: March 18 2023 Ha C9.42 07:16UTC Fantastic image Leo. Alun

Fantastic image Leo.

Alun

Alun_H

Superb image set Clare and Peter.

Alun

Alun_H

Great result Rainer. I have the CEM60 and had problems with the USB 2 hub by way of always dropping connections so I ripped it out of the mount along with all the onboard wiring. I got a project box and installed the hub in to it thinking I use it off the mount and the thing still don't work. As you...

Alun_H

Spent a bit of time tinkering with the Sol'Ex in regards the focus of the collimator lens on the slit. Instead of the setting of infinity focus on the camera/lens assembly I removed the slit housing along with the collimator lens tube as a unit and using the trusted method with a finder scope (in th...

Alun_H

Thank you Alexandra,Mark for the kind words.

Alun

Alun_H · Re: Solar Observations March 11 2023 Fantastic images Gerard. Alun

Fantastic images Gerard.

Alun

Alun_H

Superb images Richard.

Alun

Alun_H

I tried to keep the gain low but once again because of the clouds I had to rush,,there were clouds drifting across the Ha as I recorded the scan. here is a single frame from the Ha line recording along with the CaK..Looking at the Ha I think I had too low an exposure time as the fine line beneath is...

Alun_H

Got a few breaks in the clouds mid afternoon today so took the chance on running off a couple of scans in the Calcium K and Hydrogen Alpha wavelengths using my 72ED and Sol'Ex with QHY5III 178M,16x sidereal speed used on CEM60 to force the scans,reconstructed in SHG_MAIN ver3.7,these are single scan...

Alun_H

Douglas answered this very question over on the french Solex-project group and following his advice I 'd say there is nothing to stop the use of an alt-azimuth mount. :) https://groups.io/g/Solex-project/topic/solex_with_alt_az_mount/97113844?p=,,,20,0,0,0::recentpostdate/sticky,,,20,2,20,97113844,p...

Alun_H

What is a scan? I know nothing about one of these except it can image in any spectral line. Because of this they have great potential. A scan is where the slit of the spectroheliograph is placed to one side of the solar disk then using a 16x (or less) sidereal speed on the mount and a fast frame pl...

Alun_H

Thank you Alexandra and James for the kind comments.

Alun

Alun_H

Fantastic project,thank you for sharing. You have inspired me to convert my old Bresser 152.

Alun

Alun_H

Fantastic images Maurits!

Alun

Alun_H

Superb images from you both,Clare and Peter

Alun

Alun_H

Fantastic images Eric.

Alun

Alun_H

Thank you Mark!

Alun

Alun_H

Superb images Douglas,love the detail in the close ups.

Alun

Alun_H

Superb images Douglas,love the detail in the close ups.

Alun

Alun_H

Thank you all for the kind words. Douglas I followed Bob Yoesle's thread regarding the Celestron 150 f/8 so all the credit goes to Bob, https://solarchatforum.com/viewtopic.php?t=31786 and as I have the Helios version I just carried out the same spacing,although I think I went a bit wider at 3mm. I ...

Alun_H

Thank you all for the kind comments.

I was hoping to get more recordings to hopefully create an animation but the clouds got in the way once again

Alun

Alun_H

Used my Lunt CaK B1200 module on my 150mm f/8 achromat on which I have re-spaced the air gap between the objective lenses and stopped down to 100mm f/10 to record a 700 frame SER of this large prominence on the western limb along with a 500 frame SER for the limb with a DMK 31AU03AS mono camera (USB...

Alun_H

Superb images Stu especially the full disk from your CaK mod,well deserved SPOD.

Alun

Alun_H

rsfoto wrote: ↑Sat Feb 25, 2023 7:41 pm Hi,

What is the length of the travel of the focuser tube of the Evostar 72ED ?

38mm

Alun

Alun_H

Thank you Rainer,the exposure time is set to around 6.77 milliseconds and I use the gain to alter the brightness (being careful not to push it so increasing noise) with the camera in 1x1 binning. I don't have any other filters in the light path although at times I will put an Hydrogen Alpha 7nm filt...

Alun_H

Hi Douglas,I was rushing to capture the data so yes the gain might have been pushed a bit higher.

Alun

Alun_H

Chasing the gaps in the clouds I eventually recorded a few scans in the Hydrogen alpha wavelength earlier this afternoon (15:34 UT) with the 72ED and Sol'Ex but this time round I used the Hoya Pro ND16 filter at the front of the scope in place of the Herschel wedge. The image is a stack of three out...

Alun_H

Congratulations Oleg.

Alun

Alun_H

Superb images Eric.

Alun

Alun_H

Fantastic images Ken.

Alun

Alun_H · Re: Hbeta & Halpha spectroheliograms 2023-02-22 Thank you Mark. Alun

Thank you Mark.

Alun

Alun_H

Only had a small window of opportunity to get a scan or two earlier this afternoon before the Sun disappeared behind the neighboring houses but I managed to record a scan in the Hydrogen beta and the Hydrogen alpha wavelengths with the 72ED/Herschel wedge and Sol'Ex+ QHY5III 178M. 16x slew speed use...

Alun_H

Superb images Clare and Peter.

Alun

Alun_H

Thank you Mark.

Alun

Alun_H

Thank you Mark.

Alun

Alun_H

Thank you James,yes Hbeta lies in the pale blue at 4861A .

: spectrum.JPG (22.13 KiB) Viewed 1340 times

Alun

Alun_H

Great results Rainer and much sharper when using scope at f/7.5.

In regards SLIM software,I haven't used it myself but the download is here viewtopic.php?t=21608

Alun

Alun_H

Superb image set Pedro.

Alun

Alun_H

Fantastic animation Jim.

Alun

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