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Hi Profiler,
With my current setup I do not really need to use a Barlow as my LE5mm and LE 7.5mm give me 714x and 476x on the Mewlon 300. Also with my my prior SCT systems I did not need to use a Barlow either. So I have not tested my LE5 with a Barlow to compare.
My prior personal experience with Barlows on older refractors was not that good but I know that Barlow quality is much better now that what it used to be when I first used them.
I have heard that both theTV Nagler 2-4 Zoom TV Nagler 3-6 Zoom are very good and may be more flexible for your use.
Consider that for your FL and Aperture using Tak FS60 a theoretical maximum usable magnification of around 100x per inch:
1. With a Native TV Nagler 3-6 zoom you will achieve
60x, 72x, 90x, 120x
2. With a Native TV Nagler 2-4 zoom you will achieve
90x, 120x, 180x
3. With a Native Tak LE5 you will achieve
72x
If you go down the fixed Eyepiece Path you will need 3 different eyepieces (perhaps Tak LE5, Tak HI-LE 2.8 , Tak HI-LE 3.6) to achieve:
128x, 100x, 72x
You will also then need to consider a high quality Barlow/Tele-extender.
Either way assuming comparable optics the TV 2-4 Zoom or maybe the TV 3-6 Zoom seem a more flexible option.
Cheers
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