Quote:
Originally Posted by JJDOBBER79
So, you would recommend the xw 10 in a 12". with a 31mm nagler. with the 2x and the 2.5x that will give me 31, 15.5, 10, 7.75, 5, 2.5. That is also a good spread. Will the 2.5 be completely useless or ok on planets. Any thoughts on the barlow question. I am just wondering why people tend to have every size rather than a couple of them and a couple of barlows.
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Hmm. That could work no doubt.
2.5mm is 600x mag. You may get to use that effectively once? Maybe twice a year?.
If you want to keep it in the family then 10mm Delos is also available. The 12mm Delos is an option as well. That will barlow to a 6mm. Which is still a bit high. The 14mm Delos barlows to a 7mm. That's 107x to 214x respectively. A very nice spread. I sometimes wonder if buying the 8mm Delos was really necessary for general observing due to the nice spread the 14mm barlowed gives.
To answer your earlier question on the difference between a Barlow lens and a powermate. A barlow and powermate both increase magnification. A barlow will increase the magnification depending on its distance from the eyepieces bottom lense. I.E the GSO 2" 2x barlow will increase magnification by 2x in its stock configuration. Screwing in the barlow LENS on the end of eyepieces like a ES 2" eyepiece it will increase magnification by 1.6x instead of 2x. Adding spacers can increase the magnification over 2x. A powermate from what I understand has a fixed magnification. A 2x powermate will increase magnification by 2x whether its 1mm away from the bottom lens to 1 meter away.