Well Mike, for ID-ing a single galaxy in a galaxy cluster, the Telrad alone might or might not be enough. However, the same could be said for some optical finders.
Yes, this is true. But for me the important point is to position the location of the object in the main telescope's eyepiece. To do that, I don't need to see the object itself in the Telrad or the optical finder. The optical finder, however, will show me the location more accurately and allow me to position that location more precisely in the eyepiece.
You aren't looking for faint targets, then. Most of the objects I've been viewing recently aren't visible in a 50mm finder either, because they're too faint or too small. I'd need a 100mm finder just to begin to see the faint spots and even then that might not be enough.
I don't get the point. Or maybe you didn't get my point. I try to make myself clear, but I don't always succeed.
I was just saying that, yes, I don't see most of the objects I'm looking for in the optical finder. But I do see their location
In other words, I can see the specific grouping of stars that surround the object. That's all I need. It's not necessary to actually see the object itself in the finder. I center the location
of the object - as shown by SkySafari on my Android tablet - behind the crosshairs of the optical finder. No, usually I don't see the object in the finder. That is precisely because it is a faint target I'm looking for. But I will see it in the eyepiece of my main scope.
And for me, I like to have that extra magnification and ability to see fainter stars that the optical finder gives me beyond the naked-eye view of the Telrad. These advantages help me to get a better fix on the location of the faint object, even if I can't actually see it until I look in the main telescope.
When I'm looking in the optical finder, the most important thing is getting the location centered precisely, whether or not I can actually see the intended object. For many faint objects, centering that location is much easier to do with a finder that magnifies and brightens the environs of the object.
Remember, I don't usually have a "finder eyepiece" in the focuser of the telescope. I think many people - I'm not saying all - rely on a "finder eyepiece" to find the object after star hopping with the Telrad. Then they may switch to a shorter focal length for a higher power view. I go from a quick look through the Telrad, to a star hop with the optical finder to center the location
of the object, then straight to a medium to higher power eyepiece in the telescope - depending on the object.
So, AFAIK, many observers are actually using that "finder eyepiece" in lieu of an optical finder after positioning the scope with the Telrad. I'd rather do most of my star hopping with the optical finder.
To each their own. Whatever works.