your favorite EP for planetary observation (f/10)?
Posted 16 March 2013 - 03:05 PM
Posted 16 March 2013 - 03:28 PM
There will be a lot of opinions on this. It should make for interesting reading...
Posted 16 March 2013 - 04:04 PM
Posted 16 March 2013 - 04:24 PM
Posted 16 March 2013 - 04:56 PM
Posted 16 March 2013 - 05:23 PM
Posted 16 March 2013 - 05:39 PM
First Id refer yiu to this article review by Daniel Mounsey: www.cloudynights.com/documents/planetaryeyepieces.pdf
My short advice: go with some televue plossls, regarded by many t o be the best planetary oculars on the market. For some eyepieces with a custom bent Siebert optics is well regarded. Dont be afraid to add a televue barlow. Mine are essentially invisible additives in terms of detrimental effects or artifacts.
I cannot encourage you enough to read Mounseys article.
Posted 16 March 2013 - 05:44 PM
Posted 16 March 2013 - 06:57 PM
Posted 16 March 2013 - 07:05 PM
For my 5" f/12 EQ refractor, 6 or 10mm ZOA II or 8 or 11mm TV Ploessl.
8" f/6 Dob, usually not EQ, 7mm Pentax XW
12.5" f/5, 10mm XW
Posted 16 March 2013 - 07:28 PM
I have a set of Baader Hyperions and the 13mm works well, but the TV plossels give better images. The Hyperions are good, but not as good. The Hyperion 21mm does not barlow as well as the ES and has a more difficult eye placement when barlowed. I recently looked thru a variant of the Thomas Back planetary 58 degree eyepeces. These are good designs and come close to the TV plossels. I would love to try a Pentax or Vixen LVW in the 10-14mm length, but I have not had the chance.
Posted 16 March 2013 - 07:33 PM
28RKE + 2.5x Powermate
I'm looking at purchasing a high power EP for a CGEM 925 HD. Do you have any favorites you would recommend?
Jupiter will just sort of "float" there, somewhere in between you and the eyepiece. You will not believe your eyes!
Posted 16 March 2013 - 07:33 PM
Posted 16 March 2013 - 08:07 PM
BRANDON - When I first reviewed this eyepiece I was hard on it because I was hoping to get a bit more warmth out of the image for Jupiter. What I'm about to share with you may sound surprising but this occured at Charlton Flats where we conduct planetary observations. My friend Jorge and I were observing Saturn with his 8" TMB and his then new Badder binoviewer. We tested various eyepieces that night. The 12.5mm UO's, 15mm Parks Gold Series, 16mm Nagler T5's and a set of 16mm Brandons. To my amazement and Jorge's, we were actually shocked to see that the Nagler T5 16's clearly beat out both the UO and Parks GS. We could easily see less light scatter in the 16mm T5 Nagler's, then when we popped in the Brandons it was all over. The image was completely etched in tack sharp contrast and clearly out performed these other sets of eyepieces. Like I said before, I was hard on the Brandon's, but they are highly regarded eyepieces. Pons loaned me two complete sets in brass for testing. Images are completely white and neutral and are probably the finest eyepieces for solar wedges. If you've never seen sun spots in a solar wedge, trust me, you don't know what you're missing. Glass and mylar filters are not even close in comparison to a solar white light wedge! The Brandons are highly recommended and are stunning on the Moon.
Posted 16 March 2013 - 08:30 PM
XO 5.1. That puts an f/10 scope at about 0.5mm exit pupil, the highest I usually go for planet observation. IMO, the XO's are the best eyepieces for viewing planets, unless maybe you want to pay two or three times higher for a ZAO.
CGEM 925 HD = 92.5" FL = 2349.5mm FL
That would give him 460x....far too much power.
@ F/10, you have many choices over eyepieces needed correction wise for a fast scope, but I would still get a higher quality eyepiece for planets.
Posted 16 March 2013 - 08:54 PM
Thank you very much for the update link and pertinent information. Looks quite compelling based on the the observer/author of the article. Very interesting. I want to read through his full update when I have the time.
Posted 16 March 2013 - 09:25 PM
Posted 16 March 2013 - 09:51 PM
Posted 16 March 2013 - 10:42 PM
Posted 17 March 2013 - 12:41 AM
Posted 17 March 2013 - 08:34 AM
Posted 17 March 2013 - 08:53 AM
For planets, I use a binoviwer. That made more difference to me than any eyepeice choice ever has.
Because the C14 is such a big aperture, I often cannot exploit the highest powers the scope can use (you may not be able to either), but what I tend to use the most are 17mm Hyperions, 15mm Vixen NPL Plossls, and when seeing permits (rare) 13mm Hyperions. I would say the 15mm NPLs get the most use though, but only because that is about as high as I can usually go due to seeing (about 266x).
But the binoveiewers easily make more difference to me than the differece between this or that eyepeice did.
Hard to go wrong with Televue Plossls, but at the same time, you can find similarly well performing Plossls for less money.
I had the Televue 15mm and the Vixen NPLs seem to offer the same performance. In side by side comparison, there was no detail in Jupiter that I could see in the Televue that could not be seen in the Vixen NPL.
But if you want to planetary view, before you spend a lot of money on eyepeices, consider buying an inexpensive pair of binoviewers and some inexpensive 12mm Plossls and give that a try. (Don't forget that your telescope will give more magnification with a binoviewer than it will without).