Ok everyone, I'm at paralysis from analysis point in my decision process here. Which would YOU choose if TFOV is important you??? Thanks in advance!
- Baader Morpheus 12.5mm 76°
- APM 12.5 Hi-FW ULTRA-WIDE 84°
- APM XWA HDC Hyperwide 13mm 100°
I’ve used all three of these eyepieces. One important aspect is whether or not you need glasses while observing. If you do then the 13mm APM is out and the 12.5mm Morpheus is the clear favorite as the 12.5mm APM is borderline for glasses.
Assuming you do not need glasses then in order I would recommend:
1. APM 13mm. This eyepiece is super-sharp and comfortable to use. I found the entire field accessible, but a smaller field is easier. I don’t have one because I really need glasses to correct for astigmatism at the exit pupil this eyepiece provides. But if not for that I would have kept it.
2. 12.5mm Morpheus. Very comfortable and the 76 deg AFOV is possibly the ideal combination of wide field and easy to take in. This eyepiece provides a very engaging view that is highly immersive.
3. 12.5mm APM. Actually a very good eyepiece except for one performance flaw that is a deal breaker for me. This eyepiece has one of the worst cases of “edge of field brightening” I have seen. EOFB is when the sky background is not uniform from center to edge and the outer field has a brighter sky background than the central field. You can see this with a lot of wide field eyepieces and some narrow field eyepieces. Sometimes it can be ignored. I find with the 12.5mm APM it is impossible to ignore. If you are limiting the use to lunar/planetary then it may not be an issue, but if you are looking for deep sky the EOFB seriously detracts from the quality of the view.
Edited by russell23, 24 January 2021 - 10:30 AM.