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Post by davy on Feb 24, 2014 13:15:13 GMT
Uncle john dropped in by the garage today and dropped off a lens from a liddel set of binos he bought. Im going to attempt to homebrew it so it can be removed if I wish.. prob going to try and fit it inside a couple of rubber seals so it can be popped out if need be..
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Post by Dragon Man on Feb 24, 2014 14:04:17 GMT
Interesting idea Davy.
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Post by Deleted on Feb 24, 2014 14:40:10 GMT
You will find as I did, that the lens is almost a perfest size to slip inside the eyepeice adaptor. If you carefully reduced the diameter of the lens by a fraction, with some dry 80 grit car body sanding paper, it will slip right in.
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Post by davy on Feb 24, 2014 17:48:40 GMT
Cheers guys..unc wants to go up into Kilsyth hills to a view point and do a video on his scopemobile meade lx90 12" campervan mod and take some shots of the forth rail bridge,, if we can get a decent day for it..would not be up there at night think there are werewolves up there. ..maybe just the local neds drunk lol..
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Post by Deleted on Feb 24, 2014 18:03:00 GMT
That will be interesting Davy. Whould like to see how its put together.
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Post by davy on Feb 24, 2014 18:14:48 GMT
Will have a wee rumage about in garage tomorrow when I get a chance..doing a freezer installation just now in a barrs irn bru icecream van..doing the hardware install for the sparky to wire up..bit of joinery tomorrow and wire up the 240 v consumer unit..been a while since I last done a van install nice wee change
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Post by Dragon Man on Feb 25, 2014 13:44:47 GMT
The trick will be keeping the lens perfectly aligned in a flat plane perpendicular to the light path. The slightest bit out and you will get very bad coma on one side of the FOV.
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Post by Deleted on Feb 25, 2014 14:08:46 GMT
The trick will be keeping the lens perfectly aligned in a flat plane perpendicular to the light path. The slightest bit out and you will get very bad coma on one side of the FOV. Ahhh I was worried about that. I actually chipped my lens trying to squeeze it into the adapter to get it flat. Good job I have a couple spare One thing I noticed was the lenses are not completely flat on either side. I will try Allan's tip and sand down the edges a bit to fit better.
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Post by Dragon Man on Feb 25, 2014 16:13:02 GMT
The need to be exactly perpendicular is why I show how to use an eyepiece barrel in my video. Any method of keeping the lens exactly perpendicular is essential.
Why do you need to mount the lens 'inside' the adaptor anyway? Seems like a lot of unnecessary work, and also the closer the lens is to the sensor the less it will focal reduce. One side of the lens should be dead flat which is perfect for surface mounting.
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Post by davy on Mar 1, 2014 16:44:29 GMT
Ok messed around with the reducer lens from the liddl binos and have a couple of fixes... C to t adapter and a t to 1.25 adapter the lens can be sandwiched between the two adapters this gives you the camera with a 1.25 option for fitting to scope..
C to t adapter and a vision king flip mirror the lens from the binoculars have to be taped up around the outer edge so it doesn't fall into flip mirror trim excess tape from lens and sandwich between flip mirror and c to t adapter. .
Both these options hold lens square and can be removed at anytime in seconds.. Sorry no pictures image to large to post.
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Post by Deleted on Mar 9, 2014 17:35:13 GMT
Well I made 2 variations of the reducer, each with a different distance from the camera chip, so I could have a choice of reduction. Unfortunalely neither of them worked due to lack of in focus with my 120ED. So instead, I used an Antares 0.5 reducer on a shortened nosepiece and BINGO, it worked a treat.
I need to experimnt with the Lidl reducers a bit more just to see if I can make a working reducer out of them.
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