Bresser 127/1200 Stage 2 Mod

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FRAZ
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Bresser 127/1200 Stage 2 Mod

Post by FRAZ » Mon May 29, 2017 6:25 pm

Hi All,

I had a 100mm Mod, built with the assistance of Solarhound a couple of years ago. I decided to try to upgrade with the Bresser 127 and sticking the 110mm ERF inside the tube.

My difficulty was going to be in finding the majick spacing and then fitting the etalon with no machining capability. I have come up with a solution using this scope that may be of interest to others.

I am using the Etalon / Focuser / BF combo from my existing Mod so that will make it much easier.

Fraz.

Image
Attachments
Bresser127.jpg
Bresser127.jpg (369.64 KiB) Viewed 1075 times
Coronado 60 DS BF15 - EQ6 Pier mounted - Stage 2 mod completed.

FRAZ
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Re: Bresser 127/1200 Stage 2 Mod

Post by FRAZ » Mon May 29, 2017 6:26 pm

The method of inverting the focuser to achieve etalon position without cutting the tube or manufacturing a part.
Image
Attachments
Bresser127Focus.jpg
Bresser127Focus.jpg (593.01 KiB) Viewed 1072 times
Coronado 60 DS BF15 - EQ6 Pier mounted - Stage 2 mod completed.

FRAZ
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Re: Bresser 127/1200 Stage 2 Mod

Post by FRAZ » Mon May 29, 2017 6:33 pm

And a few example shots from the setup.
240517_NewMod2inv.jpg
240517_NewMod2inv.jpg (895.86 KiB) Viewed 1071 times
240517_NewMod6rich.jpg
240517_NewMod6rich.jpg (415.23 KiB) Viewed 1071 times
240517_NewMod13.jpg
240517_NewMod13.jpg (568.19 KiB) Viewed 1071 times
240517_NewMod14.jpg
240517_NewMod14.jpg (1.02 MiB) Viewed 1071 times
Coronado 60 DS BF15 - EQ6 Pier mounted - Stage 2 mod completed.

FRAZ
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Re: Bresser 127/1200 Stage 2 Mod

Post by FRAZ » Mon May 29, 2017 6:34 pm

This was the very first shot before I rotated the PST (Thanks for that tip Mark)
240517_NewMod1.jpg
240517_NewMod1.jpg (349.76 KiB) Viewed 1069 times
Coronado 60 DS BF15 - EQ6 Pier mounted - Stage 2 mod completed.

FRAZ
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Re: Bresser 127/1200 Stage 2 Mod

Post by FRAZ » Wed May 31, 2017 7:45 pm

Here is a later image now that I am getting used to it.
310517_3tonemapped.jpg
310517_3tonemapped.jpg (288.28 KiB) Viewed 1012 times
310517_2tonemappedcuttofeck.jpg
310517_2tonemappedcuttofeck.jpg (184.23 KiB) Viewed 1012 times
Coronado 60 DS BF15 - EQ6 Pier mounted - Stage 2 mod completed.

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GUS
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Re: Bresser 127/1200 Stage 2 Mod

Post by GUS » Thu Jun 01, 2017 7:42 am

Fantastic captures Fraz, great mod.

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Re: Bresser 127/1200 Stage 2 Mod

Post by FRAZ » Sat Jun 03, 2017 9:29 pm

Thank you Gus.

The principal reason for the Mod was to find a method that Modders with no machining access can enjoy the benefits too.
Anyone can PM me for advice on this Mod, many others can provide better expertise generally and the wider forum is a better bet for that.
Coronado 60 DS BF15 - EQ6 Pier mounted - Stage 2 mod completed.

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Re: Bresser 127/1200 Stage 2 Mod

Post by marktownley » Sun Jun 04, 2017 9:50 am

Thanks for this, interesting info and a good mod. This is one (of the many!) potential scopes on my shopping list...
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http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

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Re: Bresser 127/1200 Stage 2 Mod

Post by FRAZ » Sat Jun 17, 2017 8:56 pm

Additional relevant information: When you invert the focuser, it allows you to extract focuser and therefore the etalon position to find the optimum position. I initially found the focuser tube position at best in the fully retracted position and could find the same quality a few centimeters out.

I have never tried to push further to the negative but it is possible that it is better there. (Please let me know if you find it can be improved)

Cheers,
Fraz.
Coronado 60 DS BF15 - EQ6 Pier mounted - Stage 2 mod completed.

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