Quote:
Originally Posted by ausastronomer
IMO the 17mm and 22mm Naglers don't perform all that well in an F5 newtonian unless used with a paracorr, which by itself is an expensive item. When used in combination with a paracorr these 2 eyepieces perform superbly.
Further, I don't think these 3 eyepieces give a big enough range, nor utilise your barlow to it's maximum potential.
Understanding you want long eye relief and good comfort and assuming your barlow is 1.25" and you don't own a paracorr, I would consider going along the following lines.
26mm Televue Nagler
14mm Televue Delos barlows to 7mm
10mm Televue Delos barlows to 5mm
You can't barlow the 26mm Nagler but it gives you a much larger true field of view than the 17mm and doesn't need a paracorr to perform at it's best in an f5 newtonian.
This lineup gives you the following magnifications and exit pupils.
All of these will work well in your scope without a paracorr.
This gives you a good spread for both deep sky and planetary observing. If you wanted to add a 4th eyepiece into the range then I would do things a bit different to this.
Cheers,
John B
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I agree with John and think his advice is sound.
He giving you some suggestions of great glass that will really shine in your scope today but also last a lifetime!
I am a fan of buying the best you can once in your life and then using it forever.