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Red Dot Sights (Reflex Sights) on Spotting Scopes

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Old Sunday 1st April 2018, 13:59   #126
wllmspd
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Now got a sight in order, give me a while to think and test out. Iíd like to avoid screws that can get lost, but the alternative might not be robust enough to being knocked. Also want a design that minimises overhangs when FDM printed. Thanks for the link.

Peter
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Old Sunday 1st April 2018, 23:40   #127
Super Dave
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Thank you Henning. I found the part in the box.

I tried two red dots. I prefer the tube style since the red dot is easier to locate.

I ran out of elevation adjustment and still need to bring the red dot lower to match the view. I might try to shim the mount unless you have any other ideas.

Very cool product. Thank you very much for sharing.

Dave
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Old Monday 2nd April 2018, 00:01   #128
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The design does not get in the way of the scope cover. I was testing out the red dot and it definitely speeds up spotting stuff. Very nice accessory!
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Old Monday 2nd April 2018, 08:32   #129
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Hi Dave,

Quote:
Originally Posted by Super Dave View Post
Thank you Henning. I found the part in the box.

I tried two red dots. I prefer the tube style since the red dot is easier to locate.

I ran out of elevation adjustment and still need to bring the red dot lower to match the view. I might try to shim the mount unless you have any other ideas.

Very cool product. Thank you very much for sharing.

Dave
I'm glad.you like it! With regard to adjustment range, you probably need to turn the adapter a little against the scope body. Clockwise rings down the dot, counterclockwise btings it up. It will move laterally a bit too, so you need to re-adjust the sight in both directions after turning the adapter.

That's owed to the lack of an "indexing" notch or ridge on the scope... you have to hit the 9 o'clock position "by feel" pretty accurately.

Regards,

Henning
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Old Tuesday 3rd April 2018, 14:13   #130
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Hi Peter,

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Originally Posted by wllmspd View Post
Now got a sight in order, give me a while to think and test out. Iíd like to avoid screws that can get lost, but the alternative might not be robust enough to being knocked. Also want a design that minimises overhangs when FDM printed.
One could make the rails' outer edges slightly wedge-shapes, then slide a ring over them that would push the rails together and fix the clamp in place.

(Or simply use a re-usable cable tie for that, eliminating the screws.)

I'll admit that I'm not sure how to deal with overhangs, having only designed for laser-sintering so far. I'd think the body of my adapter would print pretty well upside down, or wouldn't it? Probably I need to get myself an FDM printer and try to figure that out :-)

Regards,

Henning
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Old Wednesday 11th April 2018, 09:51   #131
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Hi again,

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Originally Posted by Hauksen View Post
This shows a possible solution, to be clamped around the dewcap of the ED50:

Attachment 631783
I actually printed this design now, and it came out quite nicely:

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Here's the "overload" test ... the adapter actually is perfectly rigid and takes the load easily:

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Adapter weight is 64 g (without screws and nuts).

The design is available for free here:

https://www.thingiverse.com/thing:2857117

Regards,

Henning
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Old Wednesday 11th April 2018, 20:43   #132
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That looks great Henning. Are you going to make one for the Kowa?
Thanks,
Dave
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Old Wednesday 11th April 2018, 21:03   #133
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Hi Dave,

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Originally Posted by Super Dave View Post
That looks great Henning. Are you going to make one for the Kowa?
That style of adapter actually was my starting point with the Kowa. It is rock-solid but has the disadvantage of being a bit bulky and, more importantly, impossible to use in with the stay-on case.

I believe I actually posted pictures of the Kowa adapter somewhere near the start of this rather lengthy thread ... let me see ... there it is:

https://www.birdforum.net/showpost.p...7&postcount=37

It's actually the second prototype, featuring NATO rails.

The first one had an airgun-style dovetail. You can find a photograph here:

https://www.thingiverse.com/thing:2840381

I moved to smaller adapters mounted to the accessory thread in order to make them work with the stay-on case, and to facilitate easy removal.

Regards,

Henning
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Old Friday 13th April 2018, 18:10   #134
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Finder has arrived, now just to find time to work on a design for my scope..

PEter
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Old Saturday 14th April 2018, 09:30   #135
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Hi Peter,

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Originally Posted by wllmspd View Post
Finder has arrived, now just to find time to work on a design for my scope..
That's the fun part :-) What type of scope do you have?

Regards,

Henning
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Old Sunday 15th April 2018, 14:27   #136
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I have a 66mm William Optics Zenithstar apo that I normally use a 13mm Nagler in. Heavy for its weight... been thinking of moving to a lighter 80mm, but they aren’t cheap and finding one that I can put astro eyepieces in is tricky. I have a baader zoom that’s good, but that doesn’t seem to play nice with most scopes ;-(
I’ll probably mount the sight on a stalk from the focusser drawtube, there maybe a focus mount screw on top, I can try they if there is one. Probably need to be able to remove the sight for transport.

Peter
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Old Sunday 15th April 2018, 20:01   #137
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Hi Peter,

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Originally Posted by wllmspd View Post
I have a 66mm William Optics Zenithstar apo that I normally use a 13mm Nagler in.
Ah, I see - seems that the manufacturer uses big metal rings to mount finder scopes and such, probably not the solution you'd choose if you're weight conscious!

I'm fighting my new 3D printer at the moment ... it's actually pretty good in most respects, but I already identified one low quality fitting that gave me a bit of trouble until I broke it. Life is much easier with the quality replacement :-)

Regards,

Henning
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Old Monday 16th April 2018, 00:30   #138
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Quote:
Originally Posted by wllmspd View Post
I have a 66mm William Optics Zenithstar apo that I normally use a 13mm Nagler in. Heavy for its weight... been thinking of moving to a lighter 80mm, but they arenít cheap and finding one that I can put astro eyepieces in is tricky. I have a baader zoom thatís good, but that doesnít seem to play nice with most scopes ;-(
Iíll probably mount the sight on a stalk from the focusser drawtube, there maybe a focus mount screw on top, I can try they if there is one. Probably need to be able to remove the sight for transport.

Peter
Afaik, Pentax scopes accept astro eyepieces.
Their PF-80 is reported to be a decent quality scope and might be a candidate for you.
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