I've got an Opticron 66ED to which I've attached a Canon 20D with Opticrons own Photo adapter and a canon T mount. This gives 1100mm x 1.6 sensor crop factor at f11.5 (I think). The camera has to be operated completely in manual i.e. aperture is fixed by the scope so exposure is by manually set shutter speed which is slow if the light is fluctuating. The focussing is also manual of course. As one is viewing through the optical viewfinder this does not drain batteries and the shutter release is of course instant. Do buy a remote release though as camera shake is a problem due to the f no. and focal length. High ISO numbers are best (400 or 800) but in the right conditions, i.e. bright, the results can be good.Best used in a hide.
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