David Scott

Thank you.

Thank you. If the dot is exactly in the middle of the doughnut but the cross made by the vanes doesn't quite match up exactly (which seems to be the case) is it because the secondary is slightly misaligned?

Hi, I've a Celestron 10 inch Dob which I've been trying to collimate using the collimation cap that was included. I've looked at a lot of stuff online and by and large I think I kind of understand it, but I have a question. It seems fairly fundamental and I thought I saw it answered somewhere but I haven't been able to find it again. The collimation cap is lined with reflective foil of course, except for the hole you look through which shows up as a dark spot when you look through it. When the scope is collimated should this dark spot be at the centre of the doughnut on the primary? Thanks.

Thanks Louis.

Thanks all. I'd wondered about the Starguiders. I notice they say they're suitable for f/5 up and this scope is 4.7. Is that sufficiently faster than f/5 to make a difference or will any coma be negligible, I've never even looked through the eyepiece of a decent telescope - been using binoculars up till now - so I'm talking about things I've read about but not seen.

Hi, First post. Hello everyone. I'm planning to buy the Celestron 10" Dobsonian with the star sense explorer mount. https://www.firstlightoptics.com/celestron-starsense-explorer-series/cel_starsense_exp_10_dob.html I've looked at the Stella Lyra's and I see the advantages - and the saving - but I'm sold on the convenience of the app and I don't want to buy a cheaper Star sense and start drilling holes in my new telescope as some have done. I'm sure people would recommend those options and I respect that. So that said, the Celestron only comes with one 25mm eyepiece and I'd like to get a second - probably higher powered - one at the same time. I'm not looking for a stopgap, but for one that's worth keeping and I'm thinking it'll cost about £50-60. The focal ratio of the telescope is 4.7. I'd be really grateful for your suggestions. David