#Newtonians how to
#Newtonians portable

Be prepared to modify & fettle the scope to get the best results.Ī good laser collimator is a must and these are not cheap. These fast Newts are 'interesting' scopes and capable of good results but probably not 'out of the box'.

#Newtonians how to

My laser collimator isn't accurate, i figured that out, not stupid to not know, so i watched videos and read articles about how to collimate that laser collimator itself, so i did, i do have two, and both aren't, i collimated one, not sure about the other one, so i ignored it and keep using the one i collimated, it may not be that perfect accurate collimated yet, i have to give it a try with F4 later, and i still didn't test my F5, but as all said, F5 is easier, so i can't judge yet, by the way, i bought my 8' F5 in 2018 got it by Feb, i never tested it maybe until 2019 i think, and i didn't use it yet much, only twice or three times, so i tried to modify it first, what i did is to replace the stock focuser to dual speed, i replaced the screws of secondary to Bob's knobs and now it is a breeze, what else i need to do, later i will buy an advanced collimator to give it a try, in a video someone referred it to me he said i can use a Barlow with my laser collimator, i do have 2x and 3x and 5x, so the bottom line is, i must experiment or give it a try then i see if i give up or not. I didn't get as far as worrying about coma with mine as I was stuck at the collimation stage, but I know some do get on with f4's and I hope you're one of them Still fast but very easy to collimate compared to f4. Temperature changes also effect collimation with f4's which is something you need to take into account unless using a carbon fibre tube which is more stable.į5 is the sweat spot I found. Good advice above about purchasing advanced collimation tools, my cheap laser wasn't accurate enough. I've had a couple of f4's and found I was constantly tinkering with them trying to get them setup right. I'll be honest with you, if you like tinkering with things then you'll be happy, but if you want something that will just work out of the box for imaging then you are likely to have to invest a bit of time and extra money.

I asked about getting two or THREE same exactly Achromatic refractor for DSO imaging and all answers said it is not a good idea even with narrowbanding because they will never focus at same point for all filters of RGB and NB, so the Newt is the only cheapest option there for me, i can't spend anything over $400-500 anyway, i could never find any triplet brand new anywhere, and a doublet that good and quality isn't cheap as well so it will be closer to a triplet, it means i won't buy anything and wait longer, and my plan is to add Tak FSQ one way or another after 1 or 2 years, so an affordable APO refr is out of the plan completely because of that Tak FSQ simply, and waiting that to happen means i will waste so many targets and months without imaging, can you recommend something for my plan?

130mm aperture and i decided the larger one even 1' difference, and because i wanted 600mm or faster so i decided why not give this F4 a try, i already have 8' F5, so at 1000mm, with 0.9x i can go wider a bit to 900mm and f4.5, and with ASA 0.73 and i am at ~730mm F/3.65, so i felt like 750mm won't be a good FL if in future i reduce my 8', and i should think about 130mm F5 with a reducer to go to ~585mm using 0.9x, but then if i reduce it it means it will be faster and then i will have same F4 collimation situation almost. I didn't read this comment long time ago until i mentioned i ordered one, so it is like i buy things late and then people start to comment and mention points of pros and cons.į4 in Newt was because i wanted something as 500-600mm FL, even 600 is a bit long but i can fit some targets perfectly, so didn't want to get 650mm or 750mm, 150mm F5 is 750mm, too much, 130PDS is 650mm, i was thinkin about 150mm vs. What made you choose F/4? Slower ones are much easier for the inexperienced. My current scopes are a 8' F/4.5 and a 12' f/4. I've owned several F/4 newts and been very happy with them. You need good eyepieces only expensive ones work well at F/4. If the mirrors are really accurate this does not have to be a dealbreaker for visual use.

This need not be a dealbreaker but if the scope is for photography then the secondary will be oversize to fully illuminate the whole of a 2' circle. The central obstruction tends to be bigger.

#Newtonians portable

a 12' F/4 is a reasonable portable proposition for anyone fit and healthy with a car.