56 replies to this topic

[scotsman328i]

I just said 10mm but that's not what he asked for. Everyone need a quality 24-30mm E/P.

Yeah, if he’s choosing between the 27 and 24 Pan, I’d recommend the 24 Pan. Now after when he wants a good mid to high, but not quite high power, then there’s Delos, Delite, NagT6s etc for him to choose from for sure! 

[hfjacinto]

I just said 10mm but that's not what he asked for. Everyone need a quality 24-30mm E/P.

He was asking specifically for m13. Neither of the eyepiece he mentioned would be good for framing m13. 
 

I tried it in several focal lengths 9-14 mm frames m13 best at 1200 mm focal length.

Attached Thumbnails

• 
• 

[Mike W]

He didn't ask for a 10mm did he?

[scotsman328i]

He was asking specifically for m13. Neither of the eyepiece he mentioned would be good for framing m13. 
 

I tried it in several focal lengths 9-14 mm frames m13 best at 1200 mm focal length.

That ES 14 would be fantastic for framing M13 in an 8” Dob.

[scotsman328i]

We should ask the OP exactly what he wants the 24 Pan for? If it’s just for M13, then there are better choices to view it framed nicely in. If he wants a myriad of other objects to see and exactly what they are, then maybe the 24 Pan could be the workhorse he is looking for. 

[Mike W]

He bailed when the argument started!

[scotsman328i]

LOL. I’m just trying to think ahead for the OP if it’s absolutely a 24 Pan he wants if he only wants it for M13, or if he plans on looking for other stuff with it also. My advice? Grab a 24 Pan while you can because Explore Scientific, DeLites, Delos and many others are accessible right now, the 24 Pan is not. 

[Mike W]

I doubt he wants it just for M13 but who knows? 

[scotsman328i]

I doubt he wants it just for M13 but who knows? 

Yeah, me too. But haven’t heard back from him, so yeah, who knows? lol

[jrmacl]

Yeah, me too. But haven’t heard back from him, so yeah, who knows? lol

I think he gave up and bought a bike with his money, she gone

[HellsKitchen]

A 24 or 27mm in a typical 8" F/6 dob will yield merely 50x and 44x respectively. Not adequate magnification for M13 and for globulars in general, all you are going to see is a fuzz ball, and that's not what observing globulars is about. This is like getting a 4mm eyepiece to view the Pleiades. You'll be missing the true beauty of the object. These focal lengths are best left for larger open clusters, nebulae and sweeping the Milky Way. 

 

Globulars are meant to be split open, which means magnification. An eyepiece of 7-9mm would be an ideal choice in an 8" F/6 dob. Get in close enough to actually resolve M13, but still frame it nicely. Lots of options out there... Delite, Delos, Nagler, Morpheus, ES and the list goes on. 

[Jon Isaacs]

A 24 or 27mm in a typical 8" F/6 dob will yield merely 50x and 44x respectively. Not adequate magnification for M13 and for globulars in general, all you are going to see is a fuzz ball, and that's not what observing globulars is about. This is like getting a 4mm eyepiece to view the Pleiades. You'll be missing the true beauty of the object. These focal lengths are best left for larger open clusters, nebulae and sweeping the Milky Way. 

 

Globulars are meant to be split open, which means magnification. An eyepiece of 7-9mm would be an ideal choice in an 8" F/6 dob. Get in close enough to actually resolve M13, but still frame it nicely. Lots of options out there... Delite, Delos, Nagler, Morpheus, ES and the list goes on. 

 

 

There should be no argument for an eyepiece to provide a good view of M13 in an 8 inch F/6 Dob. There are good reasons to use a 24mm or 27mm 68 degree eyepiece in such a scope but as others have said, 50x is far from optimal for viewing globulars in an 8 inch.

 

 An 9mm-7mm eyepiece would provide from 133x to 171x, quite ideal in my experience. 

 

Jon

Edited by Jon Isaacs, 01 May 2025 - 10:57 AM.

[Procyon]

OP come back lol, get a 24 Panoptic and an 8 or 10mm Delos otherwise a 7 or 10mm Pentax. The Delos or Pentax eyepieces work real well with globular clusters.

[SeattleScott]

For M13, I would look for about an 8mm. Perhaps Delos. I have an 8LVW but those are discontinued.

For low power, I would go 24 Panoptic over the 27 to avoid the hassle of switching between 1.25” and 2” format. The 27 Panoptic doesn’t go enough wider to warrant the effort of swapping between the two formats.

[scotsman328i]

For M13, I would look for about an 8mm. Perhaps Delos. I have an 8LVW but those are discontinued.

For low power, I would go 24 Panoptic over the 27 to avoid the hassle of switching between 1.25” and 2” format. The 27 Panoptic doesn’t go enough wider to warrant the effort of swapping between the two formats.

Exactly. I pushed towards the 24 Pan over the 27 Pan for weight consideration and the 24 Pan true field.

[Starman1]

The answer is: neither.

An 8mm would be much better, and a 7mm even better.

If the OP has disappeared, he disappeared after asking the wrong question.

[scotsman328i]

The answer is: neither.

An 8mm would be much better, and a 7mm even better.

If the OP has disappeared, he disappeared after asking the wrong question.

Hope he comes back to steer him to the best tool for the job, so to speak. 

[Mike W]

I think he got the message? Anyway one thing people forget is like humid South Carolina, where the op is, rarely will the higher powers of California or dry Arizona be usable in the northeast. I'm not saying I would use a 24mm E/P on M13 but a drop in mag. is often necessary. Around here upping the mag. usually just smears the image with no useful resolution. 

 

https://www.cleardar...ndsAbNYkey.html

Edited by Mike W, 01 May 2025 - 10:27 AM.

[Starman1]

I think he got the message? Anyway one thing people forget is like humid South Carolina, where the op is, rarely will the higher powers of California or dry Arizona be usable in the northeast. I'm not saying I would use a 24mm E/P on M13 but a drop in mag. is often necessary. Around here upping the mag. usually just smears the image with no useful resolution.

https://www.cleardar...ndsAbNYkey.html

Even 150x in an 8" scope?. That's not even a high power in that size of scope.

[Mike W]

Even 150x in an 8" scope?. That's not even a high power in that size of scope.

You would be surprised, some of the nights we get here in spring to summer you probably wouldn't bother going out in the west. I was out the other night and the sky was steady but transparency was below average then an hour later it was like someone dropped a wet blanket over the whole sky and we were packing up!

Not always but more than not. 

150X probably down to 125X on a poor night, having said that I'm not sure why the op was down at 24mm? 

Edited by Mike W, 01 May 2025 - 10:52 AM.

[havasman]

Ok i appreciate it

Steel tubed Dobs can be easily balanced and used with eyepieces of dissimilar weights. Get 3 or 4 plastic coated 1/4 pound weights (or something similar you may prefer) and attach them to the bottom end of the tube. Simply slide them up & down the tube as needed to achieve balance with any eyepiece you're likely to ever need. Free yourself from the tyranny of "oh, no that one's too heavy for your scope" and use whatever you want. This fix is the simplest thing to do and it becomes second nature almost immediately.

[scotsman328i]

I think he got the message? Anyway one thing people forget is like humid South Carolina, where the op is, rarely will the higher powers of California or dry Arizona be usable in the northeast. I'm not saying I would use a 24mm E/P on M13 but a drop in mag. is often necessary. Around here upping the mag. usually just smears the image with no useful resolution. 

 

https://www.cleardar...ndsAbNYkey.html

Concur Mike. I live in Charleston. We are about to hit that time of the year where seeing is garbage clear through to October. The humidity, thunderstorms, overall seeing during summer…trash!

[Mike W]

I got so disgusted two summers ago because of the smoke and bad weather I donated my new 10" dob to the Boy Scouts and sold all my eyepieces after 60 years of observing. Here I am rebuilding my collection again! My optimism has returned for this season..................

[scotsman328i]

I got so disgusted two summers ago because of the smoke and bad weather I donated my new 10" dob to the Boy Scouts and sold all my eyepieces after 60 years of observing. Here I am rebuilding my collection again! My optimism has returned for this season..................

Good stuff, Man! Optimism is a good thing! Especially nowadays! 

[Astromorris]

Sorry for ghosting, i got busy for a while. The reason i was thinking 24 or 27 mm is that i was looking into decent exit pupil so m13 would be as bright as i can get amd still be reletively well framed. Im open to any size though.