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Focal length question?


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Indeed so. The only problem is finding the planet again after you've put the barlow in :D

James

..a most frustrating experience indeed. Only way I found is to defocus massively and look for the larger airy disk of the defocused planet and "focus into" the disk whist trying to centre the said defocused disk. I got rapidly annoyed with planetary AP for this reason.

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An illuminated reticle eyepiece is really helpful for this, so you can get the image dead centre before swapping. It's one of the reasons I like stacking a barlow and extension though, as I can recentre each time I add a new component.

James

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It is a game trying to locate a planet at high fl. I ended up using an EP to center, then non barlowed camera before fitting the barlow. Then make sure you don't lose it :huh: I noticed just standing on the lawn by the mount moved the target on the screen :shocked::smiley:

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I gave up on planetary imaging because I couldn't find the planet too - and that was with a much shorter focal length :D Otherwise the planet was too small to see much detail.

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An illuminated reticle eyepiece is really helpful for this, so you can get the image dead centre before swapping. It's one of the reasons I like stacking a barlow and extension though, as I can recentre each time I add a new component.

James

I just picked up one of those a few weeks back and it made my life so much easier for planetary work.

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