I read something a few days ago on another thread here about some upcoming Televue discontinuations. Tried to find it and cannot so I was wondering if anyone had some hard information about this.
What I do remember reading is that it would be a few eyepieces in the Nagler Type 6 series. That series currently consist of the 2.5, 3.5, 5 , 7, 9, 11 and 13 mm eyepieces. If other discontinuations can be used as a guide over the past few years (from Televue), we have seen the 26 mm type 5, the 20 mm type 5 and the 12 mm type 4 go bye-bye. Why? Only Televue can answer that question correctly, but my speculation boils down to poor sales of these eyepieces coupled with a similar or better performance from another Televue eyepiece with a similar focal length. In the case of the 26 mm Nagler, the magnification increase in going from the 31 Nagler Type 5 to the 22 mm Type 4 is just about 41% so the 26 Nagler has steps that are really too small in going from the 31 Nagler to 26 mm, and then too small again in going from 26 mm to 22 mm. In addition the 27 Panoptic which is very close in focal length and while it does not have a field of view as wide as the 26 Nagler, it is plenty wide enough and many find it to be an easier eyepiece to look thru and more affordable. Pretty much the same story with the Nagler 20 mm Type 5. It sat between the 17 mm and 22 mm Nagler Type 4's which already represented a magnification step already a bit close at 29%. The Type 4"s all have good eye relief, better than the 20 mm Type 5, so the 20 mm Type 5 probably had mediocre sales The 3rd eyepiece discontinued recently was the 12mm Type 4, with a hybrid barrel. I think the last hybrid barrel Televue. Additionally the Type 6 line competed with the 12mm Type 4 with both the 11 mm type 6 and the 13 mm type 6 as well as with the 12 mm Delos. Once again, with all the competition, sales of the 20 mm Type 5 were probably poor.
So what about the Type 6 Naglers? If it is true that one or more will be discontinued, what is most llikely to go? My opinion would tell me that those on the chopping block could include the 2.5 mm as we can get there with a 2x barlow and a 5 mm Type 6 and do it with better eye relief. Others that might be expendable would include the 9 mm and the 13 mm. Why? Magnification steps - in going from the 16 mm Type 5 to the 11 mm Type 6, the magnification increase is 45%, and in going from the 11 mm to the 7 mm the magnification increase with any telescope is 57%, perhaps a stiff jump, increasing magnification in going from the 16 mm to the 13 mm is just 23% and in going from the 13 mm to the 11 mm is only 18%. With the 9 mm inserted between the 11 mm and the 7 mm we have a 22% between the 11 mm and the 9 mm and 28.5% between the 9 mm and the 7 mm. I guess an argument could be made to keep the 9 mm, but not the 13 mm as having both the 11 mm Type 6 and the 16 mm Type 5 makes it expendable.
However this is just my speculation, what do you think?