قبل عام تقريبًا، اشتريت تلسكوب دوبسون بفتحة 130 مم ونسبة f/5، وقد كان أداة رائعة لمشاهدة النجوم. على الرغم من أن العينية الكيلنر بطول 25 مم المضمنة قد خدمتني جيدًا، إلا أنني الآن أبحث عن ترقية دون إنفاق أكثر من 60 دولارًا. أفهم أن هذا الميزانية لن تقدم عدسات عالية الجودة من الدرجة الأولى، ولكنني أتطلع إلى تحسين ملحوظ مقارنة بالعينية الأصلية.
في الوقت الحالي، أفكر في عينية Celestron Omni 32 مم Plossl كخيار محتمل للتبديل. قبل اتخاذ قرار، أردت استكشاف ما إذا كانت هناك خيارات أخرى ضمن ميزانيتي قد توفر أداءً أفضل أو قيمة أفضل.
أتفهم تمامًا رحلة البحث عن عدسة عينية بتحسن الأداء بميزانية محدودة، حيث كنت في موقف مشابه مع تلسكوبي القديم. فكرة تجربة عدسة Celestron Omni 32mm Plossl تبدو معقولة جدًا لميزانيتك التي لا تتجاوز ٦٠ دولارًا، خاصة لتلسكوب دوبسونيان ١٣٠ مم مثل حلك. شخصيًا، عندما قمت بترقية العدسة الأساسية لتلسكوبي لاحظت فرقًا كبيرًا في وضوح مشاهد القمر، فهل تتوقع أن تركز على أجرام سماوية معينة بعد الترقية؟
It’s a solid choice for a tight budget.
The 32mm Celestron is an excellent eyepiece for your budget. I own one and it provides a sharp view from edge to edge with a decently wide field. Its 52-degree field of view is typical for Plössl eyepieces, so while it’s a bit smaller than those in the next price range, it’s still quite respectable.
I spoke with r/_-syzygy-_ and ended up buying a couple of Celestron lenses from that store. They were spot on, very affordable, and saved me some money. It’s now my go-to for accessories on AliExpress. Delivery to the UK can take as little as a week.
Thank you for the suggestion.
For $60 or less, you can do much better than a Plossl eyepiece, though I still use a 32mm Svbony Plossl as my low-power eyepiece after many years. The Astro-Tech 1.25″ PF series offers good optics and a wider 60-degree field of view for around $40. The Svbony Redline/Goldline series, at about $35, also provides a good 68-degree view.
While there are better eyepieces available for around $60, I searched last night and couldn’t find any specifically in the 30-34mm range. I recommend buying a less expensive Plössl than Celestron’s, such as the one I linked, and saving the difference for a future wide-angle or filter purchase.
I have the 32mm version, and it works well. My older Meade 26mm Plossl performs similarly in terms of optical quality—sharp on-axis with some edge-of-field loss, but good contrast and transmission. As noted, many Plossls are clones from the same factory.
The Svbony 32mm eyepiece is my favorite for wide-field viewing. I use it more than any of my other eyepieces because it lets me see entire star clusters like the Pleiades in a single view.
A 32mm Plössl is a great budget eyepiece that everyone should have. However, the Celestron Omni 32mm Plössl isn’t particularly special. Unless you buy from a premium brand like Vixen or Tele Vue, most Plössl eyepieces are essentially the same, as they typically come from a few factories in China. If the Celestron model is inexpensive, it should work fine. Otherwise, I’d suggest going with a cheaper generic option.
I have the Celestron Omni Plössl and the SVBONY 7–21mm zoom eyepiece, which together cover my needs well.
Here are some points to consider:
1. A 32mm Plossl provides the widest true field of view available in a 1.25″ format, which is useful for locating objects.
2. The view will be quite bright. In an F/5 scope, a 32mm eyepiece gives an exit pupil of about 6.4mm, which is near the maximum your pupil can dilate. In light-polluted areas, this may wash out the view. Higher magnification often improves views by making them slightly dimmer (except for stars), making star clusters stand out more and enhancing extended objects.
3. A large exit pupil like this works well for viewing nebulae with a filter—UHC in reasonably dark skies or O-III in more light-polluted conditions.
4. While it’s an upgrade from a Kellner, Plossls and F/5 scopes don’t pair well. Only the central 30 degrees will be sharp, with significant astigmatism elsewhere.
5. The Celestron Omni is a good Plossl, but it can be overpriced. Look for deals, or consider the GSO 32mm Plossl, which is the same eyepiece under a different brand and often cheaper.
6. If your budget allows, a 25mm Celestron X-Cel LX or 25mm Meade HD-60 (identical to the Celestron) might be a better upgrade. They offer a similar true field of view, wider apparent field, more magnification, and improved edge correction at F/5.