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Old 29-09-2020, 12:19 PM
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PKay (Peter)
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305mm reflector - EQ8-R

Time to have another go, this time on the EQ8-R

I have tried this on the EQ6 but it didn't like it (disaster actually).

At about 20kg, it was quite a task to lift up!

So the moon is out and that is ideal for finding focus.

Details are:
f/l 1524mm.
Aperture: 305mm
Focal Ratio f/5
FOV: 30X40 arcmin
Image Scale: 0.52 arcsec/pix

I have added a EAF to the Crayford focuser, and installed a Baader Rowe Coma Corrector for good measure.
The primary mirror has been re silvered, and the sec. mirror replaced.
Still waiting on a Baader Off Axis Guider, so in the mean time, will try the 60mm guide stuck on the side.

Wish me luck!
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Old 29-09-2020, 01:00 PM
jahnpahwa (JP)
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what a beast!! is that an enlightenenend lightbridge?
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Old 29-09-2020, 01:09 PM
Startrek (Martin)
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Peter
My goodness me what a mammoth rig , 20kg ??? My 8Ē f5 with AP is 15kg, more like 30 to 35kg with AP gear ???
Obviously only for the calmer nights or plenty of tarps strung around
A real Galaxy hunter for sure , faint galaxies too
Canít wait to see your images
Good luck with it
M
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Old 29-09-2020, 01:22 PM
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Sunfish (Ray)
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A thing of beauty. I am sure the results will be great.
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Old 29-09-2020, 05:35 PM
raymo
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The wind shouldn't be much of a problem, with it being on the EQ8, and not
being a solid tube.
raymo
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Old 29-09-2020, 06:58 PM
Startrek (Martin)
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Quote:
Originally Posted by raymo View Post
The wind shouldn't be much of a problem, with it being on the EQ8, and not
being a solid tube.
raymo
Raymo
You would be surprised how wind gusts affect your guiding on long subs , even with this big robust beast of a scope and mount
Steady light wind not much of an issue but medium to strong wind gusts or shifts definitely upset your guiding resulting in bloated or oval shaped stars
My 8Ē and EQ6-R is no slouch and itís happened to me on so many occasions Iíve lost count
Hence the comment about the tarps , they have saved many a nights imaging
Cheers
Martin
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Old 30-09-2020, 08:00 AM
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PKay (Peter)
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The test results came in.

Almost a full moon 20% obscured by cloud. No stars visible.

Rough focus achieved.
All the spacers ended up scattered around the table...

The theoretical image scale was 0.52 arcsec/pixel.

By taking measurements from the image below,
the calculated image scale was 0.55 arcsec/pixel.

Close enough!
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