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Picture

 

Avalon M-Uno Pier Plate

25/5/2016

2 Comments

 
My sincere thanks goes to Rupert Smith of Astrograph.net for his help in designing and having a pier plate manufactured for my Avalon M-Uno mount. This pier plate will finally allow me to set up my mount on the pier at e-EyE​. The following is a photograph of it assembled:
Picture
The entire pier plate is made of Steel, suited to be placed on my pier at e-EyE. The three protruding bars are attached to the base plate via M8 screws on the bottom. These are removable to be placed in whichever arrangement deemed necessary to place Avalon's own M-Uno Pier Adapter on top of it. This is also attached to the bars via M8 screws, as per Avalon's original specifications. The bars add 25cm of height to my setup, as per my own requirements at e-EyE. 

With news of e-EyE receiving my new Dragonfly remote power relay, I am heading up again with my wife this long weekend in order to get my setup 100% sorted out. I will be bringing my Avalon T110 tripod back as it will no longer be required. I will also take this trip as an opportunity to insert the Baader UV/IR Cut filter in front of my focal reducer, to hopefully fix the terrible star bloating in Luminance and Blue, as reported here. 
2 Comments
Rupert / Astrograph Ltd link
26/5/2016 01:23:57

I hope it fits after all this effort Kayron!

Interesting about the Baader UV/IR. This is a classic case of (apologies to George Orwell) 'all apo's are equal, but some are more equal than others'. When we do tests, it is noticeable how some scopes fall apart at the blue end of the spectrum and also how many blue filters dramatically shift focus. A recent test on an APM-LZOS 152 measured focus shift of only 0.113mm from 404-706nm. Ironically FSQ's are known for not being very good in terms of CA.

The irony of reflectors is that they are not actually very sensitive to blue light. Refractors are much more efficient. This is because the reflective coatings lose efficiency near UV quite rapidly. SCT's are particularly bad for this.

I'm a bit unsure about the Baader filter. Although its not sold for this purpose, I used to use them as an internal ERF for small solar systems till a polariser got burnt up behind one. Oddly, the problem does not occur with Astronomik filters which allow some UV light to pass. Odd. Astronomik now do three types of L filter cutting right up to 420nm if needed.

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The Devil Corp link
13/6/2016 12:14:02

Good site.

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