Eyepiece recommendation question...

Here's my question; Do I keep the 12.5mm Ultima or the 15mm Ultrascopic? I've basically just been using a 25mm and a 9mm for the last 10 years through high school, college, and what not. Now that I have a real job and have paid off my car loan etc.., I've went on an A-mart binge so to speak and am wanting to increase my collection to 4 oculars (try not to laugh too hard). I primarily observe deep sky objects, but also turn to the planets and moon when they're out.

Here's what I've got:
-24mm pan (absolutely keeping)
-15mm Ultrascopic (leaning towards keeping)
-12.5mm Ultima (Just bought, probably going to resel)
-9mm T1 (absolutely keeping)
-7mm T1 (Just bought, absolutely keeping)
-have a Meade #140 2x barlow and plan on keeping because it won't brig much on Amart.
Here's my setup for my 8" f/6 Dob:
-----------2x Barlow------------
EP FL EP afv Magnification True Field Magnification True Field
24 68 50 1.36 100 0.68
15 52 80 0.65 160 0.33
12.5 52 96 0.54 192 0.27
9 82 133 0.62 266.67 0.31
7 82 171 0.48 342.86 0.24

Thanks in advance for your replies...

Brian:

Since the TFoV of the 9mm Nagler is actually greater than the TFoV of the 12.5mm Ultima, I would suggest parting with the 12.5 mm Ultima and keeping the 15m Ultrascopic.

I also think that at some point you would find a high quality 15mm Widefield would make a nice fit between the 24mm Panoptic and the 9mm Nagler, the 15mm Ultrascopic only has a slightly wider TFoV than the Nagler... For an hour or two vewing in the evening, I often use 24mm TV Widefield, a 15mm TV Widefield and then either 9mm, 7mm and 4.8 Naglers or 9mm, 6mm and 4mm BO/TMB planetaries... Let's me do about anything I want.

Jon

Hi Brian, congratulations on your graduation! If yer really set on selling one, I'd opt for the 12.5, simply because I've never really cared too much for Plossls below 15 mm--eye relief just starts getting too tight for my tastes. Your 24 pan barlowed will give you about a nice 12m anyways. Alternative thought--why not just keep it? It's fun to play with different mags and you might just find it fills a niche. Alternative/alternative thought- investigate a nice 2" ep, something in the 30ish mm range for some really nice wide views.