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Hello . If anyone is using this Product . I need help ! APM 1.5x Barlow telecentric for Visual and astrophotography. I have the backfocus right....(i think) but cant see any stars or trees because i tried during daytime also . The focuser tuber went back and Forth trying to focus but Never saw anything . Just need help  |
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Are you sure you have enough inward travel to reach focus? Test the barlow with an EP and see whether you can reach focus. If you can and then move in and out of it there should be enough focus travel to reach focus with the camera too.
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IMO to make sure whether you need inward or outward travel to solve your problem: I suggest you loosen the thumbscrews on the focuser, remove the 1.5x barlow (with your image train intact), and move your imaging train outwards slowly, even out of your focuser if necessary, to see if anything comes into focus then if it does, then you need more outward travel to solve your problem, if it doesn't, you need more inward travel |
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Thanks for the suggestions. Andrea , what Do you Mean with testing the Barlow with an EP ? What EP stand for ? Thank you |
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eric belanger: *An eyepiece. If as I suspect the scope is a SW newton then you might have had one if you bought it new. |
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Ok …so i just had to Take the coma out by about 2 inches. Now …. it's a very long optical train so i Will have to add a screw to tight the coma well . To avoid flex. Thanks all  |
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eric belanger: does the 1.5x barlow have any 2" filter thread? if it does, you can try adding an M48 spacer to that so it's more secure in the focuser |
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In order to get focus, you need to move the APM 2" Barlow 1.5x corrector about 3 cm away from the focuser. I use the APM 2" Barlow 1.5x corrector for Lacerta 200/800 photonewton. For the Lacerta Octo Plus 2 focuser, I use the screw spacer shown in the attached picture (3 pieces, which are 3x12 mm). |
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Hi Eric, as far as I know, the APM has a working distance of 95mm not 105 (source TS) ?  CS Werner |
