I am new to this, having just set up a Celestron Maksutov 127mm with 1.25" focuser in replacement of an 80mm ED spotting scope, which I sold yesterday.
I mostly view from my back deck, which is at 600' elevation an .6 miles from the ocean. I look at ships, dolphins, and the beaches about 2-3 miles away to see what people are up to.
It seems this hobby has so many different expressions and pursuits, but mine is very narrow. I am only concerned with eyepieces best suited to daytime view out to sea, and up the coast, using my f13 MAK.
I read this thread: https://www.cloudyni...omparison-r2651 and came away with an appreciation for the different strengths an eyepiece may have in different circumstances.
Here are the attributes that I think, at this stage of early usage, I value:
- Longish eye relief as I wear glasses for mild astigmatism
- Center field sharpness. I am not much concerned about outer 20% distortions
- High contrast / colors that pop
- wide field of view but only if other attributes listed here are not compromised. I'm fine with 50*
- not expensive or rare
As you can see, I don't need to pay for ultra flat eyepieces whose claim to fame is clean focus at the periphery of the field of view in very fast scopes (e.g. $450 TV 24mm Panoptic). My scope is very slow, and apparently also quite forgiving of eyepiece design.
With the MAK, I was supplied with a generic 25mm plossl of 52*, and a 9mm that yields an exit pupil of 0.7, which just doesn't work for daytime viewing. I bought two eyepieces immediately to supplement or replace the 25mm -- the first is a 32mm 50* Celestron Omni ($40), and the second is the Explore Scientific 26mm 62* ($120). This ES maxes out the usable FOV for 1.25" eyepieces.
I am also considering a Russell Optics 18mm 67* Japanese glass Konig eyepiece for bright, clear days. For other than bright, clear days, I'm afraid the 1.4 exit pupil in my scope will be too dim for my purposes, and the 92x magnification would be too much for daytime atmospheric conditions.
After just reading the eyepiece article I reference above, I'm wondering if the 62* ES has compromised center focus sharpness to accommodate the wider fov. Would the TV 25mm Plossl provide a better (per my wish list above), albeit narrower fov, view for me?
As to 45* correct image prism diagonals, I have found five candidates I'd appreciate feedback on:
- Williams Optics ($80), with 25mm clear prism aperture 6 oz
- Orion, ($90), with 27mm clear prism aperture 6 oz
- Stellarvue ($69), with unknown clear prism aperture, unknown weight
- Baader, ($92), with 24mm clear prism aperture, 8.2oz
- Televue (discontinued, but still available) $60, unknown clear prism aperture, unknown weight
I already have the Celestron 45* ($30) diagonal and it appears people on this forum think this entry level 45* should normally be an upgrade candidate. The way I use my scope... I sit in a deck chair with a Manfrotto clamp attached to on the right chair arm, and the center stem from my tripod into the clamp, and a Manfrotto video head. I swing the MAK so that the eyepiece rotates around to my eye. The diagonal in this situation is sideways, parallel to the ground. I don't set the diagonal up perpendicular to the ground and look down into it.
I am assuming that all 90* diagonals will rotate the image as I rotate the diagonal? That's what happens with the star 90* diagonal that came with the scope. I ask that because I read good comments about a 60* televue diagonal, but also assume the image won't orient correctly for me when I rotate the diagonal to be parallel to the ground?
Thanks for the help.
Edited by DunninLA, 21 March 2019 - 07:36 PM.