Re: I estimate 100,000 km in height for the morning's prom.

If you can measure a prom to 5 figures your ruler is way better than mine.

On 03/21/2025 11:51 AM EDT Mark Ost <jimcoble2000@...> wrote:

?

?

Roy what do you figure? 62,137 miles high. Now that is using a scales superimposed on the sun as a guide but I think I am close.

Re: Proimence!

#57553

Thanks Kent. That gives me a third way to estimate height. Bearing in mind that photocopies never come out to original scale and computer images may or may not scale. I adjusted the image to fit my graduated guide and used a divider to check the height of the prom against the spread of the divider. I get again get around slightly less that 69,000 miles.

On Friday, March 21, 2025 at 12:02:06 PM EDT, Kent Blackwell via groups.io <kent@...> wrote:

Here is my rather crude attempt to capture the solar prominence with my 20-year-old H-alpha scope. The visual view far exceeds this rather so-so picture. I was trying to balance the telescope with a heavy camera using eyepiece projection with an old Edmund Scientific 25mm eyepiece.

Proimence!

#57552

Here is my rather crude attempt to capture the solar prominence with my 20-year-old H-alpha scope. The visual view far exceeds this rather so-so picture. I was trying to balance the telescope with a heavy camera using eyepiece projection with an old Edmund Scientific 25mm eyepiece.

_MG_9943 Crop.jpg

Re: Big Prominence!

#57551

We estimate very close in height. I did not do the length.

On Friday, March 21, 2025 at 11:13:44 AM EDT, Roy Diffrient <mail@...> wrote:

The largest I’ve seen in a long time. ?It’s curved back toward the sun, about 70k miles tall and 100k miles long.

I estimate 100,000 km in height for the morning's prom.

#57550

Roy what do you figure? 62,137 miles high. Now that is using a scales superimposed on the sun as a guide but I think I am close.

Big Solar Prominence in H-alpha!

#57549

Largest for months – it’s curved over back toward the solar disk, about 45K miles tall, 100K miles long. ?See it on Gong too:

?

https://gong2.nso.edu/products/tableView/table.php?configFile=configs/hAlpha.cfg

8" MAG Instruments Portaball

#57548

This is up for sale on Cloudy nights:

?

Disclaimer, I know nothing about the seller. Just found it interesting to see one up on a listing.

?

Jeff T.

?

Re: moon

#57547

I don't think I'll book a cruise to that one.

On Sunday, March 16, 2025 at 10:32:38 AM EDT, Ian Stewart <ian@...> wrote:

Wonderbar!

On 3/16/2025 10:28 AM, charles jagow wrote:

Show quoted text

The comparison of the views from the Earth and from the Moon at the same time of a total lunar eclipse.

Re: moon

#57546

well that's one way of looking at it

On Sunday, March 16, 2025 at 10:32:38 AM EDT, Ian Stewart <ian@...> wrote:

Wonderbar!

On 3/16/2025 10:28 AM, charles jagow wrote:

Show quoted text

The comparison of the views from the Earth and from the Moon at the same time of a total lunar eclipse.

Re: moon

#57545

开云体育

Wonderbar!

On 3/16/2025 10:28 AM, charles jagow wrote:

Show quoted text

The comparison of the views from the Earth and from the Moon at the same time of a total lunar eclipse.

moon

#57544

开云体育

The comparison of the views from the Earth and from the Moon at the same time of a total lunar eclipse.

?

v/r

?

?-??---?Gone...

?-??-??-?

--

v/r

Chuck Jagow

Future ???????

Gone... ??????

?

Lunar Eclipse clouded out

#57543

Tonight's scheduled lunar eclipse watch at Bells Mill Park has been CANCELLED due to total cloud cover.

There will be another total eclipse of the Moon next year, on March 3, 2026.

George

George Reynolds

"Solar System Ambassador" for South Hampton Roads, Virginia

Back Bay Amateur Astronomers (BBAA)?

?

Re: Binoviewer advice/experiences

#57542

Sure. All my pairs went long ago.

On Wednesday, March 12, 2025 at 02:34:18 PM EDT, Patrick Vartuli via groups.io <pvartuli@...> wrote:

Thanks Mark.? I know someone (Kent) that has the same eyepieces I have and will see if he will join in for the test.

Show quoted text

On Wed, Mar 12, 2025, 2:29?PM jimcoble2000 via <jimcoble2000=[email protected]> wrote:

I can bring my pair of Denkmeir bino viewers. I will have to find the barlow that goes with them but am pretty sure I? know where it is. I don't have eyepiece pairs though.

On Wednesday, March 12, 2025 at 02:15:41 PM EDT, Patrick Vartuli via <pvartuli=[email protected]> wrote:

That is a great idea.? If anyone is interested in lending a binoviewer at the ECSP.? I would be eternally grateful.

On Wed, Mar 12, 2025 at 2:07?PM jimcoble2000 via <jimcoble2000=[email protected]> wrote:

Might be a good idea to borrow a pair and try before spending money.?

From: [email protected] <[email protected]> on behalf of Patrick Vartuli via <pvartuli=[email protected]>
Sent: Wednesday, March 12, 2025 11:02 AM
To: [email protected] <[email protected]>
Subject: Re: [BackBayAstro] Binoviewer advice/experiences
?

Thanks for the info Mark.? I was looking at the William Optics version but began researching and was trying to understand if it was worth the reach.? I have seen a lot of posts from folks stating the struggles but indicated if you could get the issues worked out it was worth it.? My ES 20" has an back focus extension on it now and believe it would help with the in focus issue.? However my 12" does not.

?

DSO would have to be done with one eyepiece but planetary and lunar might benefit from the binoviewer use.

?

The other issue is to what magnification should you go if you choose that route?? I saw that it could become difficult for the average astronomer to combine the images (visually) over 150x magnification.

?

Thanks again for your insights.??

?

Kind regards,

?

Patrick

Re: Binoviewer advice/experiences

#57541

Thanks Mark.? I know someone (Kent) that has the same eyepieces I have and will see if he will join in for the test.

Show quoted text

On Wed, Mar 12, 2025, 2:29?PM jimcoble2000 via <jimcoble2000=[email protected]> wrote:

I can bring my pair of Denkmeir bino viewers. I will have to find the barlow that goes with them but am pretty sure I? know where it is. I don't have eyepiece pairs though.

On Wednesday, March 12, 2025 at 02:15:41 PM EDT, Patrick Vartuli via <pvartuli=[email protected]> wrote:

That is a great idea.? If anyone is interested in lending a binoviewer at the ECSP.? I would be eternally grateful.

On Wed, Mar 12, 2025 at 2:07?PM jimcoble2000 via <jimcoble2000=[email protected]> wrote:

Might be a good idea to borrow a pair and try before spending money.?

From: [email protected] <[email protected]> on behalf of Patrick Vartuli via <pvartuli=[email protected]>
Sent: Wednesday, March 12, 2025 11:02 AM
To: [email protected] <[email protected]>
Subject: Re: [BackBayAstro] Binoviewer advice/experiences
?

Thanks for the info Mark.? I was looking at the William Optics version but began researching and was trying to understand if it was worth the reach.? I have seen a lot of posts from folks stating the struggles but indicated if you could get the issues worked out it was worth it.? My ES 20" has an back focus extension on it now and believe it would help with the in focus issue.? However my 12" does not.

?

DSO would have to be done with one eyepiece but planetary and lunar might benefit from the binoviewer use.

?

The other issue is to what magnification should you go if you choose that route?? I saw that it could become difficult for the average astronomer to combine the images (visually) over 150x magnification.

?

Thanks again for your insights.??

?

Kind regards,

?

Patrick

Re: Binoviewer advice/experiences

#57540

I can bring my pair of Denkmeir bino viewers. I will have to find the barlow that goes with them but am pretty sure I? know where it is. I don't have eyepiece pairs though.

On Wednesday, March 12, 2025 at 02:15:41 PM EDT, Patrick Vartuli via groups.io <pvartuli@...> wrote:

That is a great idea.? If anyone is interested in lending a binoviewer at the ECSP.? I would be eternally grateful.

Show quoted text

On Wed, Mar 12, 2025 at 2:07?PM jimcoble2000 via <jimcoble2000=[email protected]> wrote:

Might be a good idea to borrow a pair and try before spending money.?

From: [email protected] <[email protected]> on behalf of Patrick Vartuli via <pvartuli=[email protected]>
Sent: Wednesday, March 12, 2025 11:02 AM
To: [email protected] <[email protected]>
Subject: Re: [BackBayAstro] Binoviewer advice/experiences
?

Thanks for the info Mark.? I was looking at the William Optics version but began researching and was trying to understand if it was worth the reach.? I have seen a lot of posts from folks stating the struggles but indicated if you could get the issues worked out it was worth it.? My ES 20" has an back focus extension on it now and believe it would help with the in focus issue.? However my 12" does not.

?

DSO would have to be done with one eyepiece but planetary and lunar might benefit from the binoviewer use.

?

The other issue is to what magnification should you go if you choose that route?? I saw that it could become difficult for the average astronomer to combine the images (visually) over 150x magnification.

?

Thanks again for your insights.??

?

Kind regards,

?

Patrick

Re: Binoviewer advice/experiences

#57539

That is a great idea.? If anyone is interested in lending a binoviewer at the ECSP.? I would be eternally grateful.

Show quoted text

On Wed, Mar 12, 2025 at 2:07?PM jimcoble2000 via <jimcoble2000=[email protected]> wrote:

Might be a good idea to borrow a pair and try before spending money.?

From: [email protected] <[email protected]> on behalf of Patrick Vartuli via <pvartuli=[email protected]>
Sent: Wednesday, March 12, 2025 11:02 AM
To: [email protected] <[email protected]>
Subject: Re: [BackBayAstro] Binoviewer advice/experiences
?

Thanks for the info Mark.? I was looking at the William Optics version but began researching and was trying to understand if it was worth the reach.? I have seen a lot of posts from folks stating the struggles but indicated if you could get the issues worked out it was worth it.? My ES 20" has an back focus extension on it now and believe it would help with the in focus issue.? However my 12" does not.

?

DSO would have to be done with one eyepiece but planetary and lunar might benefit from the binoviewer use.

?

The other issue is to what magnification should you go if you choose that route?? I saw that it could become difficult for the average astronomer to combine the images (visually) over 150x magnification.

?

Thanks again for your insights.??

?

Kind regards,

?

Patrick

Re: Binoviewer advice/experiences

#57538

开云体育

Might be a good idea to borrow a pair and try before spending money.?

Show quoted text

From: [email protected] <[email protected]> on behalf of Patrick Vartuli via groups.io <pvartuli@...>
Sent: Wednesday, March 12, 2025 11:02 AM
To: [email protected] <[email protected]>
Subject: Re: [BackBayAstro] Binoviewer advice/experiences

?

Thanks for the info Mark.? I was looking at the William Optics version but began researching and was trying to understand if it was worth the reach.? I have seen a lot of posts from folks stating the struggles but indicated if you could get the issues worked out it was worth it.? My ES 20" has an back focus extension on it now and believe it would help with the in focus issue.? However my 12" does not.

?

DSO would have to be done with one eyepiece but planetary and lunar might benefit from the binoviewer use.

?

The other issue is to what magnification should you go if you choose that route?? I saw that it could become difficult for the average astronomer to combine the images (visually) over 150x magnification.

?

Thanks again for your insights.??

?

Kind regards,

?

Patrick

Re: Binoviewer advice/experiences

#57537

Thanks for the info Mark.? I was looking at the William Optics version but began researching and was trying to understand if it was worth the reach.? I have seen a lot of posts from folks stating the struggles but indicated if you could get the issues worked out it was worth it.? My ES 20" has an back focus extension on it now and believe it would help with the in focus issue.? However my 12" does not.

?

DSO would have to be done with one eyepiece but planetary and lunar might benefit from the binoviewer use.

?

The other issue is to what magnification should you go if you choose that route?? I saw that it could become difficult for the average astronomer to combine the images (visually) over 150x magnification.

?

Thanks again for your insights.??

?

Kind regards,

?

Patrick

Re: Binoviewer advice/experiences

#57536

Ooooo. Bino viewers are an entire subject. I have a couple pairs but have only used them on refractors where they are typically used.

They can be very persnickety and almost impossible to be used for sharing views as each person has individual settings. Some (many) can't use them at all. The focuser will be a problem. The light path is a significantly different length than the usual set up. Many focusers can't handle the in focus required, especially dobsonians.?

Many refractors have removable tube sections to accommodate bino viewers or were purpose designed for that use. I have used years ago them but no longer do. I can't say what you expect but the weight will certainly become a factor on a dob.

The best made is the Denkmeir. but they weigh a ton. Williams makes a fair and cheaper pair but are not as good as the Denks.

A properly set up pair merges the image just fine but it takes a lot of fiddling and will work only for you. They are also light killers so are rarely used for high power.

Don't want to discourage you but.................... for a dob.................................not really.

On Wednesday, March 12, 2025 at 01:34:43 PM EDT, Patrick Vartuli via groups.io <pvartuli@...> wrote:

So, I am interested in getting a binoviewer to use with my scopes.? I have been reading about some issues that one would have to contend with when using them such as:

?

1.? Image resolving at high powers (brain can see this as two separate images)

2.? Back focus addition due to the binoviewer itself

?

Anyone have any experience or advice with this with dobsonians that would like to provide some advice.

?

Thanks in advance.

?

Patrick

Binoviewer advice/experiences

#57535

So, I am interested in getting a binoviewer to use with my scopes.? I have been reading about some issues that one would have to contend with when using them such as:

?

1.? Image resolving at high powers (brain can see this as two separate images)

2.? Back focus addition due to the binoviewer itself

?

Anyone have any experience or advice with this with dobsonians that would like to provide some advice.

?

Thanks in advance.

?

Patrick