I need to fill a hole in my eyepiece collection around 5mm. Actually, I am looking for something between 4mm to 5mm as I don't want to miss out on something close. What are some of the absolute best of the best lunar/solar/planetary eyepieces in this range still commercially available or easily obtainable used?
I would like to keep the size, weight, and number of elements down to a minimum. Ideally, it would have the best coatings, smoothest surfaces, blackened lens edges, and high quality construction to minimize internal reflections/glare. Good eye relief, ease of use, and somewhat larger fields of view would be nice too. Must deliver sharpest, highest contrast images possible.
Best contenders so far are the TV Ethos and DeLite eyepieces, Takahashi Abbe orthoscopics, or possibly a used high-end ortho. I am leaning towards the DeLite as it seems to offer the best combination of features with the fewest drawbacks.
I am also thinking about filling the 6mm hole with the new 6mm Ultra Monocentric or a 6mm Vernonscope Brandon which means I would kind of like the 4mm to 5mm to compliment these eyepieces with small eye relief and limited useful field of view by getting an approx. 5mm with really comfortable eye relief and larger, well-corrected FOV.
What are your thoughts? Are there any important options I am missing here? What are you using in this range?
BTW, this wouldn't be used in anything too fast as all of my scopes are f/7 to f/24.
Thank you so much everyone!