Ken Fiscus Stargazing since 1980 Now observing from a green zone. Z12 on custom mount, Atomic EQ platform, 100% flocked, OMI primary, Astrocrumb filter slide with O-III, NPB, Skyglow filters. Focuser & spider rotated 45 degrees, new springs & Bob's Knobs, Telrad & 9x50 straight finder 35 & 24 Pans, TV 13,7,5 T6s Custom Orion XT10 with piggyback XT4.5 Round Table EQ Platform
6'' Orion SkyQuest f/5 12.5" Astrotel truss dob f/3.3 20" Super FXQ Starmaster William Optics 80mm ZenithStar ED II 1850/2500 Observing sessions grand total for 2013, 49. So far in 2014, 11
Quote:Why don't you just try it?I have a 80mm finder on my 12.5" scope. I've used a filter, H-Beta or Ultrablock with it many times. I use the 25mm plossl that came with my 6" dob. I just slide the eyepiece in and out until there's focus. The H-Beta with the finder and eyepiece are fabulous on the California Nebula.So give it a try and report back. Bill
Quote:This is something I have never tried; using a Neb. filter screwed into the finder scope ep and into the star diagonal or scope itself. I have an 8 x50 RA Orion finder mounted on my Dob. and was thinking of screwing a Lumicon Deep Sky Filter into the finder's ep. The EP looks like a Kelner, not sure what effect the cross-hairs will have, but I thought I might give it a try. I thought about also using a low power Plossl I have, 26mm, but I am not sure the objective focus will allow enough focus travel distance. I just thought this might make a difference with a better view on some large nebula. Anyway, if someone has tried this, let me know what you think, or if this works worth a darn, or is just a waste of time.
David W. Knisely . . . . . . "If you aren't having fun in this hobby, you aren't doing it right." Hyde Memorial Observatory http://www.hydeobservatory.info Prairie Astronomy Club http://www.prairieastronomyclub.org
Meade 12.5" F/6 Research Grade
1971 Criterion RV-6
Orion Observer 70mm Refractor
Homemade 4" f/12 reflector (being rebuilt)
Quote:Nebula filters work perfectly with small apertures. I've been doing this with binoculars for years. A 10X50 bino with a pair of 2" UHC filters taped over the objectives is AWESOME! If a finder's eyepiece can have a 1.25" filter attached, this will work very well for the larger nebulae. Such specimens as the California, North America, Heart and Soul, gamma Cygni, Veil, Barnard's Loop, Pacman, and more, really benefit at such magnifications and apertures.My current home-made bino (see my Gallery, linked to below), for which I can swap 50mm and 60mm objectives, uses telescope 1.25" and 2" eyepieces, and so I can thread filters onto them. I use the Orion Ultrablock and Baader H-beta.
18" Classic Obsession w/ ArgoNavis & ServoCAT 120mm Orion Sky View Pro refractor