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Is it worth getting a 50€ 4mm eyepiece?

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#1 EfoDom

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Posted 14 August 2020 - 05:38 AM

I have an 8" Skywatcher dobson. I have some Meade Series 4000 Super Plossl eyepieces that came in a kit (6.4, 9.7, 12.4, 15, 32, 40mm and a 2x barlow) and a 10mm and 25mm eyepiece that came with the telescope. With the upcoming Mars opposition I thought I could use some higher magnification like 300x with a 4mm. So far I was able to see Jupiter nicely at 190x magnification with a 6.4mm EP but only on a few nights. I was wondering if I would be able to pull off 300x magnification on Mars. It will be much higher in the sky than Jupiter but I honestly don't know. The only available eyepiece in Slovakia in my 50€ budget is a Sky-watcher planetary, 4mm. There's also a Binorum Planetary Pro 4mm for 74€.

Is it worth getting or should I be okay with the eyepieces I already have? Will there be any visible improvements in the details of planets if the seeing conditions are good?



#2 25585

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Posted 14 August 2020 - 05:42 AM

Buy a Barlow instead, much more useful.


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#3 havasman

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Posted 14 August 2020 - 07:48 AM

Since you already have a 2x Barlow you can add to your 9.7mm I doubt you will gain anything at all by adding a 4mm eyepiece. I find magnifications over @ 250x unhelpful for planetary observing anyway with any of my scopes and usually use anything over 210x for observing the moon, planetary nebulae and extragalactic features like H-II regions and supernovae. For those I commonly use 446 and 650x with the 16".



#4 Galicapernistein

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Posted 14 August 2020 - 08:29 AM

I had an inexpensive 4mm eyepiece, but the coatings were not the best, and there were lots of internal reflections when looking at the planets. I ended up getting a 3.5mm Nagler, which is an excellent performer when conditions allow. 



#5 SeattleScott

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Posted 14 August 2020 - 08:36 AM

I would want a 4mm for that scope. No clue on those specific eyepieces though. Had a 4mm TMB Planetary that was good for the price.

Barlowing the 9.7 is also an option. Ideally both would be nice to hit roughly 200, 250 or 300x depending on seeing. Given you won’t use 300x a lot, the barlow could suffice.

Scott

Edited by SeattleScott, 14 August 2020 - 08:36 AM.



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