Quote:
Originally Posted by casstony
I just disassembled and tuned up an old WO 4" Crayford which was slipping in two places. The drawtube was slipping past the pinion - there's a tension screw over the pinion to apply extra pressure. After that the drawtube would still roll out until I added tension to the micro focuser - there's a nut that can be tightened to apply more pressure to the micro focuser bearing. The focuser now holds a 2" diagonal and the heaviest eyepieces.
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Cheers Tony. Mine will definitely need tweaking, but at this point I've found no diagrams / documentation on the process.
Quote:
Originally Posted by Slawomir
Hi Lee,
Thank you for taking time to share your first impressions with your new telescope.
I am glad that you found optics to be very good, and it looks like you can successfully image with your camera without a flattener (although using one will probably make all stars in the corners perfectly round.).
I hope you will be able to adjust the focuser so it will work reliably. I actually expected that focuser might be potentially the weakest part of this scope, but as you said, it is still too early to say that with certainty.
I will be looking forward to your new, sharper, showing more faint detail and thus more beautiful images  |
Cheers S :-)
I went up to the "obs" this afternoon to collect my larger battery for charging and thought I'd have a little look at the focuser while I was there. What I saw didn't leave me all that happy.
Turns out there's space for four bolts under the focuser, some or all of which presumably play a part in tensioning the focuser. While I have four holes, I only have three bolts in there. And while playing with the fine-focus control with the scope parallel to the ground I noted that it did not adjust the focus
at all. So, whatever I thought I saw in the dark last night was either my imagination, or slippage. I did notice last night that inward travel wasn't working with fine-focus, but I thought outward was and had assumed this was just insufficient tension. Must have been insufficient tension causing focus to slip :p
The question is, how did this pass QA? That's a pretty large oversight.