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Christian,

As I am considering purchasing a Canon 135mm f/2 L lens I will need to 3D print an adapter to the eShel. Do you have an STL file for this?

Cheers,
Bernard

Christian,

Is it a 'typo' error where you show the image of the IMX455 mounted on a Canon 135mm f/2.8 lens? I assume you mean the f/2 L lens.

Cheers,
Bernard

Christian, I have just noticed that one difference between V5.9.6 and V6.0.0 is that in the latest version the 'optimal extraction' setup has an entry for camera RON, which is not in V5.9.6. As my QHY22 camera has a RON=5.0 I used that value (default =1.7) but that did not remove the noise. I assume...

Christian, Thanks for your suggestion to change the Rejection Coefficient to 1000 as this did work. I also tested with the value 10, which also worked, compared to the original value 3 which did not work. I am puzzled about what has changed between version 5.9.6 and 6.0.0 as the rejection coefficien...

I believe there is a bug in V6.0.0 affecting eShel spectra. Using the same data and parameters the final spectra produced by V6.0.0. have many absorption spikes which are not present in V5.9.6 or earlier versions. See attached example. I have not check if a similar problem exists when reducing singl...

Here is a clearer image of the slotted drive method used, which takes care of the changing micrometer barrel length.

Cheers,
Bernard

Hi James,

Well done! I added remote control to my Lhires micrometer using a servo motor driving a slotted sleeve ... can't believe it was over ten years ago!

Cheers,
Bernard

Although I have not commented or contributed to this excellent eShel upgrade thread before I have found it very interesting and informative, especially the pros and contras of using the 'standard' Canon 85mm and the Samyang 135mm. I was trying to decide which lens I should use to upgrade my eShel pe...

Hi Gavin,

I forgot to add that you are welcome to contact me directly to discuss any matters relating to spectroscopy in general, eShel, SASER, etc ... at spectrasouth at bigpond dot com.

Cheers,
Bernard

Hi Gavin, Welcome to amateur spectroscopy and especially to the small number of amateurs doing it in the southern hemisphere. If you have not done any medium/high resolution spectroscopy before then jumping in at the deep end with an eShel is a big jump indeed ... but hopefully there are enough of u...