Apart from Mike,who has good results using his 20d .I can only repeat the comments of others.Digiscoping with an SLR is not easy.As Mike has explained in his procedure it does seem a tad complicated.Whereas with a compact cam and the appropriate adaptor,you can zoom in as high as you wish,with an SLR this is limited,esp when using the scopes extras which are compatible with the SLR.Eg,Swarro scopes have a T mount.You attach the SLR to the T mount,view your image and focus using the scope,but you cannot magnify your image.Whereas using say a Nikon 4500,or Contax(both have ceased production but are still available),you can take your image to the neccessary magnification,thereby using your scope to its full potential.
the SLR cams are much heavier in weight compared to a small compact,so you do have probs keeping everything balanced,esp in windy conditions.When digiscoping with a compact cam one can obtain the quality and magnification of a 800mmlens using 2x extenders twice over.But not when using an SlR.
This is not meant to put you off trying to digiscope using an SLR,but for the price you can pay for the extras,you could buy a compact with an adaptor,and obtain excellent results at a higher magnification.
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