I'll try to keep this short and quick and get to my point here. So, since winter here has been brutally cold as of late I haven't been able to do any real observing, during those cold cold nights and when they were clear I would use a simple pair of binoculars to get a quick fix before I froze. Surprisingly enough I was able to see quite a bit which was nice and exciting, and for the first time I was able to see the orion nebulae, and really faintly be able to tell where andromeda was due to the hint of light and some star hopping. So to my question, I was finally able to pull out my 10" Lightbridge last night, I grabbed a few wide FOV eyepieces, and took to the skies with them. I again, tried locating the orion nebulae with a 56mm, 33mm and a 26mm, and was not able to see anything like I saw with the binos. (The light/gases/clouds surrounding it) Now I know the moon wasn't helpful as it was probably 3/4 full, but I was able to locate a few stars easily in the constellation and I tried star hopping a bit more but couldn't see the light emitting from the nebulae like I had with the binos. Is this because of the power of the dob? Maybe that I'm so zoomed in I am not able to see this? Or is it more so from the moons brightness that diluted from what I saw in the binos? When I used stellarium to try and star hop it did seem like I was really zoomed out there into orion's constellation, and was quite a bit trickier to navigate it and really find what I was looking for, but I thought with the wide FOV's that if anything that alone would've helped. Or is it just that tricky on a manual dob? I'll continue to play around but just looking for some insight as I have yet to do any sort of upgrade to my dob to help in the search for dso's. Thanks for the help! CS...
I don't know what binoculars you are using, but assuming they are 10X50, they will have about a 6 degree field of view.
I don't know what the apparent field of view is for your eyepieces, but assuming the 56 is a 2" Plossl I am guessing it has a 50 degree AFOV.
FL scope / FL eyepiece = magnification
Apparent Field of View (AFOV) eyepiece / magnification = approximate field of view.
1270 / 56 = 23X
50 / 23 = 2.1 degree FOV, Field of View (approximately)
So your eyepiece is giving you about 1/3 the field of view of your binoculars. That is a pretty good field of view for a 10" scope so you are getting about as wide as you can get on that scope.
This means, with a properly aligned red dot finder you need to be able to get closer than 2 degrees to your target to see it.
However, the Orion nebula should look wonderful in that eyepiece. Then you just work up the mag level as you get in closer and closer. But use the 56 mm eyepiece as your finder eyepiece, teamed with your red dot finder.
Things look different in a telescope.
The Pleiades, for example, looks GREAT in my binoculars. But when I get it in my eyepiece I lose all of the surrounding context so it looks like a bunch of very bright stars. I like it much better in my binoculars than in my telescope.
Also, with binoculars you are using both eyes, so you get a greater feeling for depth. With a telescope you are using one eye so you lose that stereo vision effect. This is more apparent on larger targets, in my opinion, then smaller targets.
That was initially my first thought, I wasn't quite in the right spot. I have a finderscope picked out but I have not invested in it yet so the only thing I have right now is a simple chincy red dot finder. Which is almost zero help at all. So between trying to use stellarium, and my eyepieces, you can see how finding it could become quite difficult. I do plan on buying it within the next month along with a collimating set to be sure everything is aligned. Thank you for your input!!
You should be able to see the Orion Nebula with your eyes alone so a red dot finder is all you need, if you have taken the time to align it with the scope. Red dot is all I would use to get the Orion Nebula into my low power wide view eyepiece.
If you have not aligned the finder to the scope than you are going to have a LOT of problems finding things. This is something best done during the day.
Page 11 of the manual tells you how to do it.
Note that finders tend to get bumped. I do a quick alignment of my finders when I start each night's observing session. I use a bright star, put the red dot on it, center it in the eyepiece and adjust the red dot to match the eyepiece. I do the same with my 8X50 RACI finder. I do this every observing session.
Understanding Telescope Eyepieces
Understanding and using a Barlow Lens
Top right of the screen you will see your screen name with a little down arrow.
Go to My Settings. This is where you can make a number of changes.
You can set whether you want to receive private messages from people and how
you want to be notified about posts.
SIGNATURE: Also, I recommend you create a signature (my settings)
where you can list your telescope your eyepieces or whatever you wish. My
signature is at the bottom of this post. A signature helps people help you
because they know what you have. We get a lot of requests from people
saying, "I am new, what eyepieces should I get?" Now we play 20 questions
to find out what telescope they have, what eyepieces they already own, etc..
BUDGET: When asking about things to buy it is good to provide a budget. An
eyepiece can be $30 or it can be $300. If we don't know your budget we
don't know how to advise you.
Terms like "budget priced" or "low cost" have absolutely no meaning. What
is low cost to me may be expensive to you. We need numbers. In fact, consider
rephrasing to something like this, “I have the following telescope and
eyepieces and this much to spend. What would you suggest?" Give it a try.
LINKS: If you are asking a question about a specific product I suggest you
provide a link to that product so we know exactly what you are talking
about. For example, Orion sells the Starseeker IV 150. Well, it turns out
there are two different telescopes that could be described by that name.
One is a 150 mm Newtonian reflector and the other is a 150 mm
Maksutov-Cassegrain. Which are you asking about?
If there is no link then people will answer
based on the one they think you are asking about rather than the one you
want to know about.
Part of what makes Cloudy Nights so great is that people are very happy to
help one another. These tips just make it easier for us to help each other
or to understand what is being discussed in the thread. I hope you find
these tips helpful.
Glad you decided to join us in the sky.
Edited by aeajr, 24 February 2021 - 09:50 AM.