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Attaching DSLR


abodee2

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Could be a stupid question (sorry in advance):

I'm playing around with my new SW Explorer 150pds trying to attaching my dslr to it. I've got a t-ring attachment to connect it to the telescope but what i'm confused about is this: does attaching a dslr to the scope mean that i can't use any of the EP's like a 9mm or 25mm? the t-ring fits on to the x2 barlow and i'm able to mount the camera on to that, just not with an EP in.

Thanks,

Ali

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Could be a stupid question (sorry in advance):

I'm playing around with my new SW Explorer 150pds trying to attaching my dslr to it. I've got a t-ring attachment to connect it to the telescope but what i'm confused about is this: does attaching a dslr to the scope mean that i can't use any of the EP's like a 9mm or 25mm? the t-ring fits on to the x2 barlow and i'm able to mount the camera on to that, just not with an EP in.

Thanks,

Ali

Hope the following helps

https://www.youtube.com/watch?v=O89qrjQ1hrw

http://stargazerslounge.com/topic/171189-how-does-this-work-2-t-adapter/?p=1745970  Post #8

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Ali

Think of the telescope as a lens "all be it a very big ungainly one". The adaptor is just a means of attaching the "lens"

Then using the focuser on your telescope the same way you would twist the focus on a normal lens. There are adaptors out there that allow you to put an eyepiece in but these are really for planetary or lunar imaging using a webcam /ZWO type camera.

Stick to primary imaging to start and get the hang of getting a reasonable image then post here and get all the advice tips you could want. It really is a bottomless pit for information and advice.

Gareth.

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Ps Ali

No question is too stupid here if genuine. We have all been newbies and asked what we felt could be daft questions but turn out to be really helpful to others reading the post. This is a tough enough hobby what with costs,LP and the English weather so don't waste a night imaging under clear skies for the sake of asking a question.

Gareth.

Just read your location Scottish weather just as unpredictable as well. :D

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So the thing i'm trying to understand is that if you can't use an ep then how can you get the magnification to view (e.g. saturn) with just the barlow and the camera? 

When imaging with a DSLR camera you attache the body to the telescope and let the image formed by the focal length of the scope fall directly on the sensor.  The size of the image that forms is down to a combination of sensor size and focal length of the telescope.  For taking images of the planets you would be better off using a webcam, which can also be used with a barlow lense to increase the focal length and thus the effective image size on the sensor, but you will have a trade off in that the image will become dimmer and there will be less resolution of detail.  An f5 telescope such as your 150Pds is basically a compromise between a fast light garhering scope for imaging faint DSO's and scope that will give you decent luna / planetary images.  It's near nigh impossible to get a scope that will give you the best of both worlds, and at least not without spending several thousands of pounds.  Refractors and Scmitt Cassergrains tend to be excellent planetary sopes as they have long focal lengths and thus give really high magnification, and in the case of a large 11" or 14" SCT have the aperture to gather lots of light at the same time to give bright highly details images of the planets.

There are adapters that will permit the use of an eyepiece between the scope and the camera body.  This is called eyepiece projection as the magnified image formed by the eyepiece is then projeted on to the DSLR's sensor.  How well these work, I personally can say, but one thing that is apparant is that they are bulky items and can be a weight that can upset the balance of the scope.

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