I put together 8 images from 10-08-20 to 12-29-20 to show Mars diminishing in apparent size as it moves away from Earth:
Brian Combs
|
Message Recall Failure: Recall: [C14EdgeHD] Mars - 12-10-20
|
Message Recall Failure: Recall: [C14EdgeHD] Mars - 12-10-20
|
And dont believe focal lengths :)
I had an interesting experience tonight with a CPC925GPS (plus Celestron f6.3 reducer corrector) while looking at Jupiter-Saturn 1degree apart
With 32mm I could not fit the 2 planets in the same field when i put the eyepiece into the visual back.
But then I popped in the star diagonal and viola, the two fitted into the fov with a bit of room to spare
In hindsight i should have let one of them drift thru the field of view and calculate the exact size of the field
but this confirms what a lot of you probably know which is that SCTs vary the focal length when you refocus so it depends on where you put the focal plane relative to the rear cell.
From my experience tonight i wouldnt be surprised if the FL changed by 10%!
but dont quote me on that cos I didnt do the math?
David
On Wednesday 30 December 2020, 17:05:36 GMT, bgcombs44 <bgcombs@...> wrote:
No, in my case it is a 1.25x power Barlow. At least I believe it is. I will check next time I am out there to be sure though. On Dec 30, 2020, at 10:42 AM, Neal Kleinman <nkleinma@...> wrote:
?
1.25 is the inch diameter not the power of the barlow ? ? Mine is 1.25X ? From: C14EdgeHD@groupsio <[email protected]> On Behalf Of Neal Kleinman
Sent: Tuesday, December 29, 2020 12:00 PM
To: [email protected]
Subject: Re: [C14EdgeHD] Mars - 12-10-20 ? Vernonscope is a brand name sold by Don Yeir of NY. It is actually a Barlow lens. If memory serves me correct it was 1.6X ? ? I never thought to ask the question here but in seeing this response regarding camera usage, ill ask now... At our club AOSNY () we utilize a C14 and I am going to be outfitting the scope for EAA for continued public viewing.... What seems to be the consensus regarding the proper ZWO (or Equal) camera for Planetary views or otherwise? And what components seem to be working out.... This last email notes the use of a "vernonscope", a term that I have not heard of before... any help would be greatly appreciated. "Somewhere, Something incredible is waiting to be known" Carl Sagan..... ?
|
Message Recall Failure: Recall: [C14EdgeHD] Mars - 12-10-20
|
Message Recall Failure: Recall: [C14EdgeHD] Mars - 12-10-20
|
seeing the discussion on Barlows here.? For some reason I cannot reply to the posts?? So, I'll try sending this online.
I don't have the Edge version of the C14 but this still applies.? I made up a chart while I was evaluating Barlows and deciding if it was worth it to get the ASI 290 for planetary imaging. At least for me, 0.09 to 0.1 arcsec/pixel is where I like to keep the imaging scale for the larger planets with lucky imaging.? I have had the ASI178MM for a few years and used it with my EdgeHD8.? I just got the C14AF XLT in April.? I also attached my last Mars image from November 8th.
| Celestron C14 |
? |
? |
? |
? |
? |
? |
? |
? |
| ? |
No Barlow |
1.3 |
1.5 |
1.6 |
2 |
2.5 |
3 |
5 |
| Camera |
arcsec/px |
Barlow |
Barlow |
Barlow |
Barlow |
Barlow |
Barlow |
Barlow |
| ASI 120 MM S |
0.2 |
0.15 |
0.13 |
0.13 |
0.1 |
0.08 |
0.07 |
0.04 |
| ASI 290 MM |
0.15 |
0.12 |
0.1 |
0.09 |
0.08 |
0.06 |
0.05 |
0.03 |
| ASI 178 MM |
0.13 |
0.1 |
0.09 |
0.08 |
0.07 |
0.05 |
0.04 |
0.03 |
| ASI 174 MM |
0.31 |
0.24 |
0.21 |
0.19 |
0.16 |
0.12 |
0.1 |
0.06 |
| ASI 183 MM |
0.13 |
0.1 |
0.09 |
0.08 |
0.07 |
0.05 |
0.04 |
0.03 |
| ? |
? |
? |
? |
? |
? |
? |
? |
? |
| focal length |
3910 |
5083 |
5865 |
6256 |
7820 |
9775 |
11730 |
19550 |
| focal ratio |
11 |
14.3 |
16.5 |
17.6 |
22 |
27.5 |
33 |
55 |
I ended up staying with my ASI178MM and getting an Antares 1.5x Barlow (for 1.25" eyepieces).? Got it from ScopeStuff.com.? They also have a 1.6x Barlow (for 2" eyepieces) Dave Watkins
|
C14 and focal ratio/barlows
I don't have the Edge version of the Celestron C14 but this still applies. ?I made up a chart while I was evaluating Barlows and deciding if it was worth it to get the ASI 290 for planetary imaging. ?At least for me, 0.09 to 0.1 arcsec/pixel is where I like to keep the imaging scale for the larger planets with lucky imaging. ?I have had the ASI178MM for a few years and used it with my EdgeHD8. ?Just got the C14AF XLT this year. ?I also attached my last Mars image from November 8th.
| Celestron C14 |
? |
? |
? |
? |
? |
? |
? |
? |
| ? |
No Barlow |
1.3 |
1.5 |
1.6 |
2 |
2.5 |
3 |
5 |
| Camera |
arcsec/px |
Barlow |
Barlow |
Barlow |
Barlow |
Barlow |
Barlow |
Barlow |
| ASI 120 MM S |
0.2 |
0.15 |
0.13 |
0.13 |
0.1 |
0.08 |
0.07 |
0.04 |
| ASI 290 MM |
0.15 |
0.12 |
0.1 |
0.09 |
0.08 |
0.06 |
0.05 |
0.03 |
| ASI 178 MM |
0.13 |
0.1 |
0.09 |
0.08 |
0.07 |
0.05 |
0.04 |
0.03 |
| ASI 174 MM |
0.31 |
0.24 |
0.21 |
0.19 |
0.16 |
0.12 |
0.1 |
0.06 |
| ASI 183 MM |
0.13 |
0.1 |
0.09 |
0.08 |
0.07 |
0.05 |
0.04 |
0.03 |
| ? |
? |
? |
? |
? |
? |
? |
? |
? |
| focal length |
3910 |
5083 |
5865 |
6256 |
7820 |
9775 |
11730 |
19550 |
| focal ratio |
11 |
14.3 |
16.5 |
17.6 |
22 |
27.5 |
33 |
55 |
I ended up staying with my ASI 178MM and getting an Antares 1.5x Barlow. ?Got it from ScopeStuff.com. ?They also have a 2" 1.6x Barlow Dave Watkins ?
|
I see that model on the website, something newer than I am aware of. I know Don sold the product line a few years ago. I have two of their Barlow’s ? Makes sense if you just want to boost magnification a little a 1.25X. ? Oh and I am the one that recalled my last message. Sorry about that! ?
toggle quoted message
Show quoted text
From: [email protected] < [email protected]> On Behalf Of bgcombs44 Sent: Wednesday, December 30, 2020 12:05 PM To: [email protected]Subject: Re: [C14EdgeHD] Mars - 12-10-20 ? No, in my case it is a 1.25x power Barlow. At least I believe it is. I will check next time I am out there to be sure though.
On Dec 30, 2020, at 10:42 AM, Neal Kleinman <nkleinma@...> wrote:
? 1.25 is the inch diameter not the power of the barlow ? ? Mine is 1.25X ? From: C14EdgeHD@groupsio <[email protected]> On Behalf Of Neal Kleinman
Sent: Tuesday, December 29, 2020 12:00 PM
To: [email protected]
Subject: Re: [C14EdgeHD] Mars - 12-10-20 ? Vernonscope is a brand name sold by Don Yeir of NY. It is actually a Barlow lens. If memory serves me correct it was 1.6X ? ? I never thought to ask the question here but in seeing this response regarding camera usage, ill ask now... At our club AOSNY () we utilize a C14 and I am going to be outfitting the scope for EAA for continued public viewing.... What seems to be the consensus regarding the proper ZWO (or Equal) camera for Planetary views or otherwise? And what components seem to be working out.... This last email notes the use of a "vernonscope", a term that I have not heard of before.. any help would be greatly appreciated "Somewhere, Something incredible is waiting to be known" Carl Sagan..... ?
|
No, in my case it is a 1.25x power Barlow. At least I believe it is. I will check next time I am out there to be sure though.
toggle quoted message
Show quoted text
On Dec 30, 2020, at 10:42 AM, Neal Kleinman <nkleinma@...> wrote:
? 1.25 is the inch diameter not the power of the barlow ? ? Mine is 1.25X ? From: C14EdgeHD@groupsio <[email protected]> On Behalf Of Neal Kleinman
Sent: Tuesday, December 29, 2020 12:00 PM
To: [email protected]
Subject: Re: [C14EdgeHD] Mars - 12-10-20 ? Vernonscope is a brand name sold by Don Yeir of NY. It is actually a Barlow lens. If memory serves me correct it was 1.6X ? ? I never thought to ask the question here but in seeing this response regarding camera usage, ill ask now... At our club AOSNY () we utilize a C14 and I am going to be outfitting the scope for EAA for continued public viewing.... What seems to be the consensus regarding the proper ZWO (or Equal) camera for Planetary views or otherwise? And what components seem to be working out.... This last email notes the use of a "vernonscope", a term that I have not heard of before... any help would be greatly appreciated. "Somewhere, Something incredible is waiting to be known" Carl Sagan..... ?
|
Hi, Perhaps someone recalled a message and I've been sent lots of recall falure messages (perhaps everyone else has too?). There may be a setting in the forum which might need turning to the 'off' position.
no worries,
Paul kirk
|
Message Recall Failure: Recall: [C14EdgeHD] Mars - 12-10-20
|
Message Recall Failure: Recall: [C14EdgeHD] Mars - 12-10-20
|
Message Recall Failure: Recall: [C14EdgeHD] Mars - 12-10-20
|
Message Recall Failure: Recall: [C14EdgeHD] Mars - 12-10-20
|
Message Recall Failure: Recall: [C14EdgeHD] Mars - 12-10-20
|
Recall: [C14EdgeHD] Mars - 12-10-20
Neal Kleinman would like to recall the message, "[C14EdgeHD] Mars -
12-10-20".
|
1.25 is the inch diameter not the power of the barlow ?
toggle quoted message
Show quoted text
From: [email protected] < [email protected]> On Behalf Of bgcombs44 Sent: Wednesday, December 30, 2020 8:58 AM To: [email protected]Subject: Re: [C14EdgeHD] Mars - 12-10-20 ? Mine is 1.25X ? From: C14EdgeHD@groupsio <[email protected]> On Behalf Of Neal Kleinman
Sent: Tuesday, December 29, 2020 12:00 PM
To: [email protected]
Subject: Re: [C14EdgeHD] Mars - 12-10-20 ? Vernonscope is a brand name sold by Don Yeir of NY. It is actually a Barlow lens. If memory serves me correct it was 1.6X ? ? I never thought to ask the question here but in seeing this response regarding camera usage, ill ask now... At our club AOSNY () we utilize a C14 and I am going to be outfitting the scope for EAA for continued public viewing.... What seems to be the consensus regarding the proper ZWO (or Equal) camera for Planetary views or otherwise? And what components seem to be working out.... This last email notes the use of a "vernonscope", a term that I have not heard of before... any help would be greatly appreciated. "Somewhere, Something incredible is waiting to be known" Carl Sagan..... ?
|
toggle quoted message
Show quoted text
From: [email protected] < [email protected]> On Behalf Of Neal Kleinman Sent: Tuesday, December 29, 2020 12:00 PM To: [email protected]Subject: Re: [C14EdgeHD] Mars - 12-10-20 ? Vernonscope is a brand name sold by Don Yeir of NY. It is actually a Barlow lens. If memory serves me correct it was 1.6X ? ? I never thought to ask the question here but in seeing this response regarding camera usage, ill ask now... At our club AOSNY () we utilize a C14 and I am going to be outfitting the scope for EAA for continued public viewing.... What seems to be the consensus regarding the proper ZWO (or Equal) camera for Planetary views or otherwise? And what components seem to be working out.... This last email notes the use of a "vernonscope", a term that I have not heard of before... any help would be greatly appreciated. "Somewhere, Something incredible is waiting to be known" Carl Sagan..... ?
|
Vernonscope is a brand name sold by Don Yeir of NY. It is actually a Barlow lens. If memory serves me correct it was 1.6X ?
toggle quoted message
Show quoted text
From: [email protected] < [email protected]> On Behalf Of Jason Cousins Sent: Tuesday, December 29, 2020 10:08 AM To: [email protected]Subject: Re: [C14EdgeHD] Mars - 12-10-20 ? I never thought to ask the question here but in seeing this response regarding camera usage, ill ask now... At our club AOSNY () we utilize a C14 and I am going to be outfitting the scope for EAA for continued public viewing.... What seems to be the consensus regarding the proper ZWO (or Equal) camera for Planetary views or otherwise? And what components seem to be working out.... This last email notes the use of a "vernonscope", a term that I have not heard of before... any help would be greatly appreciated. "Somewhere, Something incredible is waiting to be known" Carl Sagan..... ?
|
David Moore(Ireland)
Martin Ratcliffe
Chuck Scappaticci