Beim Auswahl eines Barlow-Objektivs für den Celestron NexStar 130 SLT zur Verbesserung der planetaren Beobachtung ist es wichtig, die Fähigkeiten des Teleskops zu berücksichtigen. Obwohl dieses Modell oft für seine Tiefe-Space-Leistung bekannt ist, kann es dennoch mit der richtigen Vergrößerung zufriedenstellende Ansichten von Planeten bieten. Ein 2x Barlow-Objektiv ist eine praktische Wahl, da es die Leistung Ihrer vorhandenen Okulare effektiv verdoppelt, ohne die optischen Grenzen zu sehr zu überschreiten. Dies ermöglicht klarere und detailliertere Beobachtungen planetarer Merkmale, während die Bildqualität erhalten bleibt.
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A 130mm parabolic Newtonian works well for planetary observation, so I’m not sure where you heard otherwise.
To answer your question, I prefer telecentric Barlows because they provide consistent magnification regardless of working distance from the eyepiece. Astrotech offers a good option if you’re in the US, and it’s reasonably priced. Using it with the included 9mm eyepiece will give you 144x magnification, which is suitable for planetary viewing.
That said, I generally favor individual eyepieces. A quality 5mm like the Paradigm/Dual ED models will provide 130x with better eye relief and field of view than the stock 9mm Plössl. I’ve even used a 3.2mm version in my 130mm telescope for 203x magnification, though that’s about the limit before views become too dim for fine planetary details—though the moon still looks excellent.
Some observers prefer zoom eyepieces to adjust magnification based on viewing conditions.
Do you have a budget in mind?
I have a similar issue with my 130mm f/5 scope, which is nearly identical to the SLT model aside from the brand and lack of go-to functionality. I’ve owned it for several months and am now looking to purchase a planetary eyepiece, but I’m struggling to apply my theoretical knowledge here.
My current setup only reaches 130x magnification, and I don’t have the option to test different eyepieces due to budget constraints and no local astronomy club. Import taxes are also prohibitive in my country, so I’m not seeking specific brand recommendations.
I’ve tried a TMB II-inspired 6mm eyepiece, which provided 108x magnification and performed well. With a significant discount available, I’m considering either the 4mm (162.5x) or 3.2mm (203x) version. I understand that higher magnification is more affected by atmospheric conditions, and while many advise being conservative, I only observe on optimal nights when planets are at their highest elevation.
I’m unsure how noticeable the difference between 162.5x and 203x would be, or how significantly seeing conditions would impact the 3.2mm. My current eyepieces are basic Kellners and a cheap 2x Barlow that came with the scope. I’ve had no issues with image stability or focusing at 130x, but I’m concerned about how the f/5 scope will handle the 3.2mm. According to data, my area’s average atmospheric seeing is about 6.5/10.
Which focal length would you recommend for planetary observation?
I have one of the 4mm TMB clones, and I agree it performs well for the price. It’s a safer choice, especially if you can only get one for now. At 162x magnification, you can still see good detail on Jupiter when conditions allow, possibly catch subtle banding on Saturn and the Cassini Division when it’s visible again, and some albedo features on Mars at opposition.
That said, nothing will appear large at those magnifications. Personally, I find planets don’t start to feel big until closer to 300x.