Image diameter from infinity corrected objective
1. Do I need to focus the light before the detector? Since the objective is infinity corrected and has only parallel beams exiting the rear, does that mean that the largest spot size will be the diameter of the exit aperture? Further, if the total detector diameter is larger than this(the objective rear aperture) wouldn't it mean that focusing the beam before the detector is unnecessary?
Another important aspect, and somewhat related is attaching a CCD/cmos camera for viewing the specimen. I have the tube lens at the correct distance from the rear of the objective and the camera the correct distance from the tube lens, but I'm unsure if I will need to focus the light before the camera, similar to the detector. I guess the answer to question one will likely take care of this as well but anyway:
2. Does the light from the tube lens need to be focused for the camera? If the beam from the rear of the objective is smaller than the camera area will this be sufficient or will the tube lens make the beam larger somehow?
Thanks a ton!
Steve at OpticsPlanet
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