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@patterdalezipsuzilil hi, from experience it would be sheer luck to do so based on other parameters being equal.

​​@@nebulosityireland I then bought a short astrea cheshire with cross hairs fine tuned it then checked it on a star out of focus I forgot say I was only alighning secondary mirror with peep hole cap

Apologies, only seeing this now. Yes that's correct, this replaces a laser.

You are welcome!

You're welcome thanks. 😉

Thanks Joe. 👍🏻

Thanks 👌🏻

Hi, Yes, this is characteristic of a fast newtonian and is expected. The goal is to find the centre of the primary mirror, Centre the secondary in the primary, Then, center the camera in the secondary. Ultimately creating a centred reflection path. Hopefully, it makes sense. Thanks, Aaron

There's an illustration of this about half way down this page on cloudy nights. www.cloudynights.com/topic/635284-collimation-of-a-fast-newtonian/

Hi Aaron. Thank you. That makes sense.y secondary on f2.8 looks elongated is this normal or do I have some tweaking to do? Will check out the link. Thanks, Stefan

Yes I think the focuser included is cheap as chips which caused so much torture.

Thanks, happy to help. Clear skies. 😉

Absolutely, whatever works. I just found that the center spot and outside of the mirror was easier to see with the light. Its worth flicking between for accuracy. Clear skies. ;)

I think it could be due to centre offset, unless it is at 0 if you rotate the ocal it will look off. The laser verifies thar collimation is correct

@@jpro747 Hi, I'll test it with mine later. Does it happen if you just screw the camera or turn the entire image train?

Turning the entire image train 180 and locking in again

Ok, it’s definitely the center offset that’s causing the confusion. I checked this by reversing the center offset values and the circles match up

@@jpro747 That makes sense alright. Good to know too. Thanks.

Thanks, I really appreciate that. 😊

Hi Peter, it really depends on what you want to shoot and from what location. There's a dark sky site in County Mayo that has some of the darkest skies on the planet, no need for filters. But if you're staying around the city you should bring light pollution filters. In relation to lenses I love using a combination of my Sigma 24mm and Samyang 135mm (tracked) but it really depends on what you have available to you.

@@nebulosityireland I have a lot of time to travel while there and I want to make the most of my time. I am flying into Dublin and have an event there on day 2 but the rest is free time. The two lenses I use the most is Rokinon 135mm F2 and Rokinon 14mm F2.8 Ultra Wide. I also use the Sky-watcher 2i pro. I hope to get some deep-sky and Lunar shots. I am very new to Astrophotography. I looked on light pollution map and yeah I will bring a filter.

@@Hib.wow24 that equipment should be perfect. Lots to image with that setup, hopefully we have lots of clear skies. 😉