On 7/18/2011 9:25 AM, Stan Gorodenski wrote: > It is very interesting that you can get such good images using the 5x > barlow. The third from the bottom is very nice, and with a 40mm > Coronado! It makes one wonder if there is any real advantage in getting > a larger aperture one, such as the 90mm, if one is not doing serious > research. I couldn't think of the right words at the time and so I used the word 'research' which is was not quite appropriate because 90mm is still a relatively small solar telescope. What I was trying to say is "It makes one wonder if the increase in resolution or detail justifies the cost of going to a larger aperture one, such as the 90mm Coronado." Stan -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.