The new Day and Night MT series are designed to be used through a wide range of wavelengths. CaK, H-alpha, and White Light (which would cover night sky and terrestrial observing). If your only interest is H-alpha then the upgrade to the new objective might not provide any noticeable improvement.
However, if your interest is in a system that is optimal for a broad spectrum then you would see significant improvement when using the scope for CaK and White Light. In fact, the singlet design of the previous 60T would not provide a good image of the Sun in White Light at all.
The singlet lens system works for a monochromatic beam to be sharply imaged at the image plane. However, we need to introduce an Etalon into the light path. This requires that we collimate the light path through the etalon and then re-focus. This required that the collimation lens also do some minor correcting of the singlet. However, the collimating lens could not do a full 100% of both jobs.
By upgrading the objective to a higher quality doublet we removed the issue of broadband correction (vs dedicated) and also slightly improved the collimation through the etalon. This "theoretically" should improve the performance of the etalon over a wider FOV. Whether or not this improvement will be noticeable in the field is yet to be determined. But it certainly won't hurt the H-alpha views.
Our larger models have very high quality objectives, including a triplet. These upgrades were done such that the user would have the best of ALL worlds.
The 152T is the closest thing we have/had to a Modular Day and Night scope. The 152T could be used for H-alpha, CaK, and Night. The 152mm OTA is fairly well known. It was a great performer at 656nm, a "fair" performer at CaK, and "okay" at Night viewing. The 130mm, (triplet APO) while being smaller, is a huge improvement over the 152mm. The 130mm has proven to be an excellent performer that meets the expectations of critical users across the entire range of applications.
If H-alpha is your only interest, then a dedicated Lunt system is certainly a great choice. There are certainly some cost savings to getting a dedicated system. But it should be worth noting that a Modular system is a plug and play system and can be upgraded later with additional modules as your interests change. ie: a CaK module or a White Light Wedge. The Modules systems are easily converted to a Night System.
Edited by LuntSolar, 30 July 2020 - 03:56 PM.