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Post by Deleted on Dec 19, 2014 13:38:35 GMT
How does it work ? I've been trying the home made Iam confused as regard field of view In the daytime without a focal reducer on the nose piece bringing the scope into focus I get more field of view without it Hence when I put on the focal reducer I made it acts more like a zoom on the scope to camera I got Jupiter and the 3 moons in the fov in the early hours So looking for a little clarification If the one I mades acting in the right way Or an I just better buying the 0.5x thanks Si
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Post by Dragon Man on Dec 19, 2014 16:08:28 GMT
Si, it sounds like you are fitting a Barlow lens to the camera, not a Focal Reducer.
They do the opposite to each other.
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Post by Deleted on Dec 19, 2014 16:47:28 GMT
Yes that's what I was thinking So best purchase one Are the 0.5x ok Thanks si
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Post by Dragon Man on Dec 20, 2014 4:52:50 GMT
Si, there are so many Focal reducers available, and like telescopes, cameras etc, there are good ones and there are bad ones.
The old saying usually comes into play: you get what you pay for. But not always. I made a video on how to make your own focal reducer and they work very very well. As good as the top shelf Focal reducers.
have a look:
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Post by Deleted on Dec 20, 2014 10:05:51 GMT
Thanks And yes I tried that great tutorial I only had a pair of 8x21 binoculors with a lens that would fit And getting like a Barlow effect With just a sky glow filter I'm not finding focus , without I can pick up a few stars In all trying to do video has opened a new can of problems And I'm sure I'm missing something simple So well I will have a day looking up and reading tutorials Again Many thanks si
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Post by Dragon Man on Dec 20, 2014 10:44:20 GMT
Si, this might be a silly question on my part, but are you using the front lens off the binoculars or the eye lens?
The front lens will work like a focal reducer.
WOW, 21mm is pretty small Binocs!
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Post by Deleted on Dec 20, 2014 12:24:51 GMT
well ive scrapped that binoc lens and now just tried with the meade 8x21 finder lens inside a moon filter housing and to the end of the nose piece to me looking like a decent reduction i wasnt achieving anything like before problem i have is more the 1,25" or id try some stronger binoc lens but would mean cutting the optic to fit without with reducer to camera nose thanks si
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Post by davy on Dec 20, 2014 12:32:40 GMT
Great write ups ken ..
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Post by Dragon Man on Dec 20, 2014 12:40:13 GMT
Ahhhh that's better Si. That's a lot of reduction. Excellent result. That looks about 0.4x reduction. I will measure your images, go to the calculation website, and see how much reduction. back soon. Thanks davy, hopefully others can use the info too
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Post by Dragon Man on Dec 20, 2014 12:58:24 GMT
Si, I have calculated your Focal Reduction. You are at 0.46x I measured the only part I could see both sides of, that is the round edges part under the top of the chimney. I measured it on my monitor with a Tape Measure.
Then I measured the same spot in your Focal Reduction photo.
Then it was a simple calculation of percentage:
Your reduced image is 46% the size of your non-reduced image. Or 0.46x the size. NIIIIICE!
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Post by Deleted on Dec 20, 2014 13:36:00 GMT
thanks ken really for the information and well it put my meade finder to use after all. just the right fit And yes its certainly made a great change and with your calculations,iam thinking thats ok thanks alot for the advice and your video a great help thanks si
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Post by Dragon Man on Dec 20, 2014 14:21:37 GMT
Glad to help Si, that's what is good about this place. We all help each other
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Post by Deleted on Dec 20, 2014 20:09:00 GMT
Hi Ken, what orientation do you put the lens on? Does it matter?
Richard
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Post by Dragon Man on Dec 21, 2014 5:25:27 GMT
Orientation?
It's round so it doesn't have an orientation. Or do you mean something else?
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Post by Deleted on Dec 21, 2014 15:39:33 GMT
Ken, which side of the lens faces into the telescope or which side do you glue down to the adapter? Does it matter?
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Post by Deleted on Dec 21, 2014 20:11:14 GMT
The one I just made The optic was made up of 2 sandwich lenses The thinner one to the front into scope Exactly as it was removed from the old housing And I'd think most lens have a slight curve rise to the front Flatter on the rear to glue flat
Si
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Post by Deleted on Dec 21, 2014 20:20:20 GMT
Thanks si.
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Post by Dragon Man on Dec 22, 2014 10:13:43 GMT
Yep, Si is correct. The Binoc lenses have a convex face and a flat face. The flat face has to face the camera, the convex face towards the sky
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