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Post by Deleted on Jan 4, 2016 14:59:07 GMT
Recently bought one of these along with a 0.5 focal reducer, had a go for the first time last night in between the clouds and I'm underwhelmed to say the least, the field of view feels like I'm using a long focal length scope when I was expecting more widefield. My scope is a TeleVue Ranger 70/480 f6.9. Here is a photo of the camera with the fr attached, is this correct? Thanks Nigel
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Post by davy on Jan 4, 2016 15:41:51 GMT
Hi nigel,welcome to the forum,I have a pd1 myself and find it a decent entry level camera,I have a few samsung scb cameras as well , the pd1 has longer exposure than the scb cameras , I use the ed80 scope and dont have a problem with the view to be honest I havent used a camera with a bigger sensor ( 1/2") so I cant complain, I notice that your using a focal reducer from joy (ebay) I bought one but I never saw a big difference tobe honest.I recently bought the 0.85 matched focal reducer/flatner and it gives a bit bigger field of view,not what I expected given the money I spent. If you can stick up some screen grabs we can work out if its correct. Lot of folk use the cctv lens to get a large widefield image..you can buy c to say canon fit lens adapters and use camera lenses.davy
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Post by Dragon Man on Jan 4, 2016 16:53:35 GMT
G'day Nigel, welcome to Video Astronomy.
By all accounts the PD1 is a pretty good basic camera when used with a good Focal Reducer.
I agree with davy, please show us a screen grab of the view you are getting and we will see what is going on. A 0.5x FR should give you a nice wide FOV at that Focal length scope.
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Post by Rick in NWArk on Jan 4, 2016 17:10:12 GMT
Nigel, one thing you can do is to try a side-by-side test during the day to validate that the Focal Reducer is giving you 50% reduction.
If it's working properly then you should be getting a Field of View of 1.19° x 0.77° with a resolution of 5.59"/pixel
For comparison the Orion Nebula is 65'x60' and would be vertically cut off within your field of view (71'x 46').
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Post by Deleted on Jan 4, 2016 19:27:56 GMT
Thanks for the advice, will re-assess and get back to you ASAP.
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Post by Deleted on Jan 4, 2016 19:35:48 GMT
The shortest focal ratio scope I have is a 101/540 f5.3 TeleVue Renaissance SDF (Petzval optics) would this be a better bet? Not really a practical scope as its brass bodied and marks easily, more like a show scope.
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Post by davy on Jan 5, 2016 0:15:20 GMT
Stick to what your using and as rick says a day light test and screenshots would help get to bottom of your question.the 0.5 will half the focal length of your scope this also makes it faster should be under f4 I think.. do you use a tracking mount and are you capturing to a pc through a usb grabber. Davy
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Post by davy on Jan 5, 2016 0:24:20 GMT
Hi again nigel..did you buy the camera from phil dyer,I found my power supply gave me horizontal phaze lines on my computer..had to replace it.maplins power supply at £40 ideal..most use this on sgl and also sold by flo. Cant be many pd1 cameras left out of production now there were a few models couple were back band lower spec to the blue.
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Post by Rick in NWArk on Jan 5, 2016 1:57:52 GMT
Nigel, your field of view is determined by the effective focal length of the scope and the size and number of pixels of the camera chip. 480mm is not a bad start at all. I use an 80EDT F/6 that has a 480mm focal length.
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Post by Dragon Man on Jan 5, 2016 6:13:00 GMT
Nigel, another help guide could be my Video on the telescopes I tested for Video. You can also look at my website on different Telescope results using a 1/2" sensor Mallincam camera to get an idea of Fields of View with different focal lengths from 5 different scopes and a few different Focal reducers: ballaratman.wix.com/mallincam
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Post by Deleted on Jan 9, 2016 13:27:30 GMT
Due to miserable weather I have captured a view of an aerial which is approx 100 metres away, still need to grab some astro views though. By the way its through some double glazing as well. With and without reducer in place.
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Post by davy on Jan 9, 2016 13:59:07 GMT
Think your reducer is ok by the photos, only way to get a wider view cheaply would be to fit a fast wide angle cctv lens.the beauty of video astronomy is that a telescope isn't always required...basically its just a lens,the camera does all the work.
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Post by Dragon Man on Jan 9, 2016 14:53:34 GMT
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Post by Rick in NWArk on Jan 9, 2016 16:50:57 GMT
Nigel, I'm worried that you aren't getting a full 50%. I took your two photographs, and assuming same scope position etc. etc. and that the only difference was a focal reducer, I looked at the relative pixels and came up with the following: Guys, feel free to correct me if I'm off here.
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Post by davy on Jan 9, 2016 19:05:52 GMT
We bow to your wisdom rick lol..
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