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Hi Jared,
I've had all of the Nagler T4's for about 20 years. I like them because they have longer eye relief than most of the older Nagler eyepieces, have a large eye lens and give a very immersive view.
The 22mm Nagler T4 is an excellent eyepiece, one of my favourites, but really needs to be combined with a Paracorr when used in a newtonian faster than ~F6, to deliver premium quality views, as does the 17mm Nagler T4. A lot of people would be happy with the view without a paracorr, but it is far from perfect near the EOF, due to some coma and field curvature. The paracorr cleans up the EOF in both the 17mm and 22mm beautifully. The 24mm Panoptic is an excellent eyepiece which is sharp and a favourite with many because of its smaller 1.25" format. IN a larger telescope like a 10" and larger dob, I personally prefer the 2" 27mm Panoptic over the 24mm Panoptic as it gives a more immersive view due to its much larger eye lens and has much better eye relief than the 24mm Panoptic. I use the 27mm Panoptic as my low power eyepiece in my 10" dob as it is much smaller and lighter than the 31mm Nagler and IMO just works better in a 10"/F5 scope.
Depending on your sensitivity to coma/field curvature and whether or not you have a paracorr, you may not be totally happy with the 22mm Nagler in your 12"/F5 scope. I won't use the 17mm or 22mm T4's in any of my scopes without a paracorr. With the paracorr they are superb, without it they get a pass mark IMO in a faster newtonian.
If you end up not happy with the 22mm Nagler, have a look for a 2nd hand 27mm Panoptic. You certainly won't need the 22mm T4 and the 24mm Pano.
Cheers,
John B
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