Thought these deserve their own thread....evaluated with both my APM 70mm APO and Lunt (APM)100mm APO.
Over several nights in central Nevada at 7000 feet (SQM 21.8) and last night in my rural backyard at 4400 ft (SQM 21.45) I've been evaluating the new APM 24mm UF and 18mm UF against some pretty tough competition....24mm Pans and 18.2mm DeLites, both IMO the "gold standard" in their respective focal lengths.
To be honest, I cannot make up my mind when it comes to the 18mms......at this point, I'm leaning in favor of the UFs because of easier eye placement which is high on my list of factors to be considered.
Contrast seems to be virtually identical between the pairs and after my initial comment that the DeLites have better edge correction, I'm thinking its pretty much of a draw and the last 10% where the stars slightly flare, it's the binocular's field curvature, not the eyepieces as it can be refocused to pinpoint stars at the fieldstop.
The afov feels a bit more "spacey" in the 18mm UFs....I think they are a few degrees wider.
With the 24mms, I think the old standbys, the 24mm Pans have a slight edge with slightly better contrast and edge correction. I also like the smaller form factor. The eye relief of the UFs is definitely more comfortable which is a big point in their favor. The fov is virtually the same. Pincushioning in the UF 24s is hardly noticeable whereas the 24 Pans definitely have a "rolling ball" effect while panning.
When you consider the difference in cost, especially when buying pairs, the APMs are remarkable and I can highly recommend them.
Oh yeah, the barrels of the UFs are smooth and the dust covers stay put on the eyecups.....TV take note.
Anybody who has experience with either the 15mm UFs and 10mm UFs, please post your opinions.
Edited by Mr. Bill, 29 August 2017 - 06:23 PM.