Eye Relief – This refers to how close your eye has to be to the lens in order to see the full field of view. Excellent article, thank you very much for taking the time to publish it. This scope should have the OP set for quite a few years . A young person's fully dark-adapted eyes may have 7 mm-wide pupils. New season, new night sky targets! I have the 2” 20 mm as one of my low power wide view eyepieces and it is excellent in my F5.9 scope. This is the link to the eyepiece I am looking at potentially buying, would you recommend this over the Orion one or vice versa do you think? Wonder what the difference between astrophotography monochrome and color cameras are? Is there anyway you could include links to the eyepieces you mentioned in the last paragraph of your reply as I’m totally new so worried about buying the wrong thing! Planetary Eyepiece(s?) This guide will help make your decision process a little easier. Yes, eyepieces is a large and complex topic. but the meat of the article is about understanding the considerations and specifications to know when selecting eyepieces. This guide offers some insight and explanations on different eyepiece types, specifications, and how it all ties together to optimize your astronomy and astrophotography sessions! In general terms, the higher the AFOV number the more the eyepiece will cost. If it does, swap in an even higher-power eyepiece, etc., until you hit that "sweet spot" where image brightness, image scale, and the amount of visible detail combine to form the most pleasing view. Where a difference can show up is that a lower number focal ratio scope will make it harder for an eyepiece to provide a uniformly good, in-focus image all the way across the field of view due to the steeper angle that the light arrives at the edges of the eyepiece with a low focal ratio scope, as compared to a high focal ratio scope. For example I have a scope that has a focal length of 400mm, if I use a 10mm eyepiece I get x100 magnification (still enough to barely make out the disc but not ideal). Hey Lou, thank you so much for the feedback! Under the “Corrective Lens” Section, are those lengths (accompanied by example photos) referring to the eye relief distance or the eyepiece focal length? Many approach the quality of the premium brands. Using this approach you would buy a 2X Barlow and hold off on the 4 mm and 3 mm to see if you can reach these magnifications often enough to justify buying an eyepiece. Eric. Hey everyone, huge fan of this subreddit! With regards to budget, whatever works well and is on par with the quality & capability of the telescope. I consider the Plossl to be the minimum standard for a good eyepiece. It’s a powerful scope. Hey Richard, it sounds like the issue is closely related to eye relief. This blog will provide an introduction to the Bayer filter system and how it is used in color cameras to produce color astro-images! In our example, we targeted 200X as the top magnification. This will become more apparent the wider the AFOV is of the eyepiece, in my experience. Easy to understand, especially for us beginners. As you saw in the article, they eyepieces that would be best for you, or your child, is based on your budget and what your goals are. Usually, you'll want to start with low power (i.e., long eyepiece focal length, such as 25 mm or 30 mm) to get the object in the field of view of the telescope. In the beginning, you are not going to know what the atmospheric conditions might be in your area. Under my sky it was rare that I would be able to get over 225X and still maintain a good quality image, except on the Moon. Great article on choosing eyepieces. But you need to know, first, if you will be wearing glasses when you observe. Again this is more noticeable in lower focal ratio scopes. Note that we also gained a 16 mm magnification at no additional cost. After a fair amount of research I decided upon the Orion xt8i for my first scope and Im waiting for it to arrive! Consider something between 35 and 40 mm in focal length with an AFOV of 65 degrees or wider for your lowest power eyepiece for your telescope. Perhaps you should seek out help from your local astronomy club. I purchased the Celestron Starsense 102mm refractor, focal length 660mm, stated highest useful magnification is 240x; it should arrive in about 2 weeks.