And now for the image , duh!

Ok, I have too many variables, things are not locked down. I believe I can now lock down the two Pentax Takumar lenses. So this is the horizontal scan line shown on Genika. The line is at best focus without any sharpening involved. One variable is that I do not have fine control of the horizontal li...

I was hoping that either way this line was in focus. The collimator is the 2nd piece that has been focused, possibly poorly. The lighting used was a fluorescent lamp so not a strong lighting force. I also thought that the horizontal scan would be right but the 'bloating' at both ends I didn't want t...

I am still at the building and fine tuning stage of my SHG, a la thesmiths. So this is my first image. Camera - 1st focus, Collimator 2nd with Telescope 3rd focus. It is taken with the aid of a 50x50mm Holographic DG. And I am assuming at the1st Order. To my eye the top and the bottom is out of focu...

Fantastic animation Banjo!
Just to say on my older Mac FFmpeg shows a malicious bug when using Virus Total.
Use with the usual cautions.
John

Well I had thought I had some luck on Saturday 30 March, but as soon as I had put up the CR-150 on my mount and fitted all the pieces. I knew it was hopeless. Meter blue confirmed as well.Even with the iris set at 50mm dia. I couldn't modify the conditions. The conditions were appalling here in cent...

This from the same popular CR-150, aka the CR-6. This all prior to Bob’s useful info on shimming with 3.2mm spacers (Ca-K), they are on there way to me. 3 days in a row with the sun after nearly 4 weeks of poor no sun weather. The first two were very poor but today the seeing was steady and and occa...

GreatAttractor, we are at some 230m above sea level. Yes it was a 100mm William Optics. DeepSolar64, Ca-k wavelength. Nice shot for white light! Indeed everyone thank you for all your comments. I've set up late today, and have been testing out new configuration around a CR150 (nice scope), I can now...

and the Genika log

File size... I off to lay down now.

2nd Last try... Drag and drop doesn't work!

Nothing is working now.

Last try...

Fourth attempt now to get my images in the right order and not to have duplications of the photos.


I do hope you like this from 2020. One or at most two days of very good seeing in all of four months. The weather was the worst in many years.

All the best
John

Well done and well deserved Alfred, all things percolate down to the little ones.This forum at its best.
All the best
John

Well, this makes more sense now, thank you for your full knowledge on this.
This helps.
All the best
John

Rupert Hi. I had second thoughts about posting this, but it proves what was said "It is possible to increase the F/D by adding a spacer..."" I've given up on the idea of a f35 system many years ago, but if someone made such a system I might jump for it, but, I'm concentrating on Hires...

Well I found the link to Frederic's "Setup with HaT" from March 23 2015 Screen Shot 2020-08-14 at 12.20.19.png Where a spacer is used to get to f/35. [attachment=1]Screen Shot 2020-08-14 at 12.20.19.png[/attachment] Is this plainly impossible. I'am reading all the way thru' "Commercia...

Hi.

"Disassembled Coronado CaK 90mm" by piekielrl, Wed Jan 08, 2014

With photographs and all the texts please.
All the best
John

Oh, an image from 2014 in La Palma.

John

Peter Hi. Thank you very much for the details and the curve. In 2010, I was in deep discussions with Dave Groski for more than 3 years. I opted for the Clifton Horne’s SHS that appeared in a copy of Sky and Telescope, in October 1971. It was fully built, my documentation of the build was poor compar...

I am going to have to double stack my Lunt modules now thats for sure!
John

Excellent, I took the liberty to show the sharpest image from the middle of the run.

It adds very little but a nice run none the less.
All the best Alfred
John

Very detailed workings being shown here Peter. I am slowly building my 2nd SHG. This one is a Littrow ala Fulvio Mete and I shall almost certainly use a 50mm x 50mm reflective holographic grating from Thorlabs. The extreme infraRed parameters for this grating collapse just beyond 825nm, so I must as...

Very good images Jochen

Exceptional image Christian. I find that the cells look very much like the shiny cells of G-band very flat like float glass.
All the best
John