Compound lens from unknown source as Focal Reducer.
| All images are with a Toucam 740K, and a Celestron C8. | |
| .Here is a cropped image of a back of a playing card at Prime Focus (f10) at a distance of ~10meters. |
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| The lens assembly that I'm using as a focal reducer has a one lens that is smaller than the other. Depending on which way I place the lens, I get two different focal reductions. Here is an image of the same card above with the smaller lens facing the OTA. This gives about an f5. |
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| With the larger lens facing the OTA, I get this image. Looks like about an f2.5. |
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| Here is a composite image to show the reductions I'm getting with this lens assembly. | |