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Post by Deleted on Dec 21, 2013 21:56:13 GMT
Hello All, I'm looking at various scopes at the minute to use with but that will give me a wider field of view than the current C11. I do use the Mallincam MF5 reducer with the C11 but with the Mallincam Xtreme to FOV is still pretty tight. The problem I find is that if my Goto accuracy is having a bad night it is pretty tough to find certain targets. The idea is if I use another scope with one of my other cameras (CR6) I may be able to use this to see roughly where the target is. I can then nudge to mount in the right direction to get the target centred onto the main OTA and camera. As I have the AZ EQ6 I can mount two separate telescopes so this is currently what I'm looking at: Any thoughts or advice very much appreciated. Regards Karl
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Post by Deleted on Dec 21, 2013 22:14:32 GMT
Hi Karl take a look at "equipment modifications" under finder suggestions and there is good stuff there. There is a link to Modern astronomy who sell an adaptor for c mount to 9 x 50 finder which is probably all you need. With the integration set to between 8 and 16 you should easily see the target. I could see the crab and most targets with the eye through my little 6 x 30 finder so the cam will see them and with the same FOV.
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Post by Deleted on Dec 21, 2013 22:22:39 GMT
Thanks Carl,
I'll take a look. I was looking for something I could focus remotely though which is why I was looking at the refractor. Would a smaller 6 x 30 finder give a better FOV?
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Post by Deleted on Dec 21, 2013 22:44:53 GMT
No Karl that's just what I'm working with but a 9 x 50 with cam would easily find yor target with a set focus so no need to refocus. Once set up as its a finder it should then just be case of turning the cam on for each outing no further adjustments needed. If that makes sense.
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Post by Deleted on Dec 21, 2013 23:44:20 GMT
Thanks Carl, I think I'll do a test run with finder I have. I did not think it would be big enough though to pick up DSOs. Another thought I had though was that some objects are simply to big to fit into the C11 FOV. Therefore when looking at these I was going to use the Mallincam on the other faster scope. Another one I have been looking at for this kind of thing and as it is Christmas www.firstlightoptics.com/equinox/skywatcher-equinox-80-apo-pro-ota.htmlCheers Carl
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Post by Deleted on Dec 22, 2013 0:01:07 GMT
Ahh in that case go for it Ken prefers the 80 for FOV and you can see the results Orion in full. Your getting a better Santa than me lol.
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Post by Deleted on Dec 22, 2013 0:11:44 GMT
The problem with this though Carl is it means I have to buy the boss even more to justify it! Just looking at the various options at the minute but I have to get something for Christmas I've been a good boy for weeks!! Plus when Christmas is over no more excuses so I say make hay while the sun shines
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Post by Dragon Man on Dec 22, 2013 4:22:21 GMT
Actually, the Skywatcher Equinox will give an even wider FOV than the normal ED80 because it is only 500mm fl = f6.3, whereas the ED80 is 600mm fl = f7.5
It also depends on the Focal reducer used. I use a 0.7x
But whichever Focal Reducer you use, the short focal length of the ED80's and the Equinox gives a fantastic wide FOV.
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Post by Deleted on Dec 22, 2013 18:39:36 GMT
Actually, the Skywatcher Equinox will give an even wider FOV than the normal ED80 because it is only 500mm fl = f6.3, whereas the ED80 is 600mm fl = f7.5 It also depends on the Focal reducer used. I use a 0.7x But whichever Focal Reducer you use, the short focal length of the ED80's and the Equinox gives a fantastic wide FOV. Thanks Ken, it does look like a nice scope to have and for several uses. I can not work out though if at F6.3 I'd get a wider FOV than the C11 using the MF5. I am not sure but I think the MF5 reduces the C11's F10 quite considerably but I could not tell you to what! I need to do some more reading I think.... Cheers Karl
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Post by Dragon Man on Dec 23, 2013 5:46:20 GMT
Karl, the best way to find out the FOV of any scope and focal reducer is by using Ron Wodaski's CCD Calculator. It is a free download here: www.newastro.com/book_new/camera_app.phpYou use the drop down lists of telescopes and cameras, then choose an object from the objects list to see it's FOV. It looks like this; Attachments:
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Post by Dragon Man on Dec 23, 2013 6:30:29 GMT
Here Karl, to make it a bit easier for you I have done the calculation. The Framed FOV is VERY different. I have used Rosette Nebula as an example. Pic 1 - C11 with 0.5x Focal Reducer Pic 2 - Equinox f6.3 Native Pic 3 - Equinox f6.3 with 0.5x Focal Reducer
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Post by Deleted on Dec 23, 2013 11:38:27 GMT
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Post by Deleted on Dec 24, 2013 0:56:36 GMT
Karl, the best way to find out the FOV of any scope and focal reducer is by using Ron Wodaski's CCD Calculator. It is a free download here: www.newastro.com/book_new/camera_app.phpYou use the drop down lists of telescopes and cameras, then choose an object from the objects list to see it's FOV. It looks like this; Nice one Ken, this is perfect. I have just downloaded the Free software and will have a go at it now! Many thanks Karl
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Post by Deleted on Dec 24, 2013 1:00:49 GMT
Hi Chris, We are thinking along the same lines, I saw the Meade the other day and it does look good I must say! His buy now seems high though considering the price new but hopefully his reserve is not silly and you get lucky Cheers Karl
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Post by Deleted on Dec 24, 2013 1:13:31 GMT
Here Karl, to make it a bit easier for you I have done the calculation. The Framed FOV is VERY different. I have used Rosette Nebula as an example. Pic 1 - C11 with 0.5x Focal Reducer Pic 2 - Equinox f6.3 Native Pic 3 - Equinox f6.3 with 0.5x Focal Reducer Hi Ken, Just tried it but can't find the Mallincam in the menu! Is there another version? Cheers Karl
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Post by Dragon Man on Dec 24, 2013 14:16:18 GMT
No Karl, you have to add the missing cameras and scopes yourself.
All you do it make a new listing, then go up to the pixel size area and enter the correct pixel sizes. If you look at mine you can copy it. You don't need to fill in the pixel size data, I just did it for fun.
All you need to enter is the Sensor size dimensions.
Same with the scope, If the scope you want to know about isn't listed just pick one and change it's data in the telescope boxes. The software works it all out using focal ratio, focal length, aperture, and chip dimensions.
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Post by Deleted on Dec 24, 2013 14:25:22 GMT
No Karl, you have to add the missing cameras and scopes yourself. All you do it make a new listing, then go up to the pixel size area and enter the correct pixel sizes. If you look at mine you can copy it. You don't need to fill in the pixel size data, I just did it for fun. All you need to enter is the Sensor size dimensions. Same with the scope, If the scope you want to know about isn't listed just pick one and change it's data in the telescope boxes. The software works it all out using focal ratio, focal length, aperture, and chip dimensions. Thanks Ken, Will have a go at this later, am I right in thinking the FOV is inside the grey box? This will be really useful in deciding which scope to go for thanks again Karl
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Post by Dragon Man on Dec 24, 2013 15:18:33 GMT
Yes Karl, the drawn rectangle on the image shows the FOV of each combination. See how the size changes on the Rosette nebula. Notice how the FOV with the Equinox and the 0.5x FR is bigger than their image
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Post by Deleted on Dec 24, 2013 23:59:44 GMT
Yes Karl, the drawn rectangle on the image shows the FOV of each combination. See how the size changes on the Rosette nebula. Notice how the FOV with the Equinox and the 0.5x FR is bigger than their image Thanks Ken, I think it's a no brainer for the Equinox! Thanks Karl
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