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Having looked through my Lunt, my old SM60, some PSTs, single and double stacked and Pauls excellent SM40, there are some differences between them. The double stack on the Lunt made the image similar in brightness to the PST. The advantage was simply in the amount of detail and the ability to handle more magnification. THe double stack PST was quite dim. VIew between the SM60 and the Lunt were very similar, when unshackled. main advantage of the Lunt is the FT focuser that makes imaging soooo much easier.
THe SM40 was simply spectacular for it's size, lovely little scope!
Malcolm
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