C10NGT, Z8, 150 Rumak, XLT 150, C6, C5, SW5 Newt, 4.5 Ball, C102GT, C90, ST80, A70LF; 15x70, 25x100; Burgess BV; Paracorr II; T6 2.5, XO 2.58/5.1, Ethos-SX 3.7, Delos 4.5, TV Plossl 7.4-26, BCO 10, Hutech HC 12.5, Sterling 12.5-25, ES100 14, CZJ H 16/25, CZJ O 16, M5k UWA 24, T5 31, Ultrascopic 35, Titan-II 40; Bino Pairs M5k UWA 6.7, Baader Zoom 8-24, M5k SWA 24, TV Plossl 26, RKE 28.7; Zooms NZ 2-4, NZ 3-6, Leica ASPH 8.9-17.8, Baader 8-24; Baader Zoom Barlow, VIP Barlow
Quote: the XW 20m is a great eyepiece for DSO hunting in an f/5 Dob ... as long as it is kept in a Paracorr.
Happy owner of-- A Mag 1, 12.5 inch Porta Ball A Dual Axis Equatorial Platform A PST Double Stack
14" Strut; 10"XT; 102ES; 22 in Process; 3.5,5,7,10,14,20mm Pentax XW; 17.3 & 12mm Delos; 27mm Panoptic; 20&24mm ES 68; 24mm ES 82; 30mm ES 82; 6&10mm BCO;
Dob guy for sure
Bill The opinions expressed herein are solely mine as an amateur astronomer hobbyist & consumer. Information herein was correlated from experience, discussions with others, & research from multiple sources freely available at time of posting. All reasonable care & skill was used, but no warranty is made as to accuracy, & liability cannot be accepted for errors/omissions. This is for information only and not intended nor implied to be a substitute for professional advice.
10" F/4.7 Modified Skywatcher Reflector 38mm Orion Q70, 17mm Modded Ultima LX 10mm TeleVue Delos, 7mm Pentax XL
Quote:Bill,Do you love the XW 20 in your 10" f/5 Dob without a Paracorr? Mike
Quote:I had a similar experience the last few nights working with my Leica ASPH zoom and the Paracorr 1 in my f4.65 dob. The naked Leica started getting mushy 2/3 of the way to the edge but the Paracorr 1 cleaned it right up and gave me a nice sharp image of Jupiter across the FOV. I was extremely impressed.
Quote:If you look at the 24-26mm Review I did, you will note that just about all the eyepieces showed the XT10's coma at the same point in their FOV, or about 1/2 way. So the question really should be if I like ANY 20mm-ish eyepiece in my XT10 w/o Paracorr? Answer is yes
Quote:When using a long focal length eyepiece in my XT10 w/o Paracorr, I know what the limitations will be an just accept them. The outer half of the FOV is going to be aberrated. So I just focus on the central part of the FOV and leave the off-axis to my less critical peripheral vision. Doing this things look just fine and can focus on the very engaging view the XW provides, along with its very comfortable exit pupil.
Quote:I used to have the 24 Pan as my largest TFOV 1.25" eyepiece, but after getting the XW, even with it's FC, the more important (for me) on-axis was more engaging and had a lot more "pop" to the star fields. So I traded off the off-axis for a better on-axis and sold the 24 Pan.
Quote:If some day Tele Vue decides to replace the 24 Pan with another 24mm-ish max TFOV 1.25" eyepiece, and gives it a nice 20mm of eye relief with their reputation for a superb off-axis, then I will get it. But until that day comes, to my eye the 20XW wins over the 24 Pan.
Quote:Bill,Quote:When using a long focal length eyepiece in my XT10 w/o Paracorr, I know what the limitations will be an just accept them. The outer half of the FOV is going to be aberrated. So I just focus on the central part of the FOV and leave the off-axis to my less critical peripheral vision. Doing this things look just fine and can focus on the very engaging view the XW provides, along with its very comfortable exit pupil.Yes, often I use long focal length eyepieces without bothering to insert them in my Paracorr. The image appears better with the coma cleaned up, but I can live with it for a quick look. But I cannot live with obvious FC. I just won't do it.
Quote:Dear Mike,Thanks for your report. It has been my experience as well. since I got pentax XW from 40 down to 7 mm, I just do not feel any urge to buy new EPs, except for the baader zoom!! but the zoom makes my life easier when it is -20!!
CPC1100 AstroTelescopes 80 mm f/7, 102mm f/11 ES AR127mm f/6.5 Zummell 254mm F4.9 Dob Coronado SolarMax II 60mm Delos 14mm, Axiom LX 10mm, 15mm 1.25"; 19mm, 23mm, 31mm 2" AstroTech Hi Grd Plossl 4mm, 6mm, 12.5mm, 17mm, 20mm UO Abbe Ortho Volcano tops smoothies Titan 26mm 2" ES 20mm 1.25" Celestron 40mm Plossl (came w/ scope) 1.25" Meade 5000 series 14mm Plossl 1.25" Baader Hyperion MkIII 8-24mm Zoom Pentax XW 7mm 1.25" TMB II planetary 3.2mm, 5mm 1.25" Lumicon UHC filter 2", OIII 2"
Quote:We are all different in our likes or dislikes. Why no one eyepiece can ever be best. In a Newt w/o Paracor, coma is an aberration I can't fix, so the off-axis is permanently mucked up. With FC, if I am lazy and don't re-center my area of interest, a small turn of the focuser know makes it nice and clear. I don't consider the FC all that bad in the 20XW...and its so little in the 14XW that my eyes can accomodate it. The 14XW is actually my favorite eyepice of all the XWs.