Date   

Re: Guideascope question

 

You will be fine without a barlow at those relative image scales

it's when you get above 3:1 that it gets dicey, and i would not go above 4:1

On Tue, Jan 11, 2022 at 8:42 AM steven ho <StevenHoffman53@...> wrote:
Thanks Brian, I will be using a QHY600M camera. Here are both scope and guidescope potential image scales....

Telescope
0.74 arc seconds per pixel at FL 1050mm
0.97 arc seconds per pixel at FL 798mm (with reducer)
 
Guidescope 
1.98 arc seconds per pixel at FL 250mm
0.88 arc seconds per pixel at FL 563mm (with 2.25 barlow)

Steve



--
Brian 



Brian Valente


Re: Guideascope question

steven ho
 

Thanks Brian, I will be using a QHY600M camera. Here are both scope and guidescope potential image scales....

Telescope
0.74 arc seconds per pixel at FL 1050mm
0.97 arc seconds per pixel at FL 798mm (with reducer)
 
Guidescope 
1.98 arc seconds per pixel at FL 250mm
0.88 arc seconds per pixel at FL 563mm (with 2.25 barlow)

Steve


Re: Guideascope question

steven ho
 

It's Guidescope not a Guideascope, damn fat fingers.

LOL


Re: Guideascope question

 

Steve -

what is the imagescale on your imaging setup? if you go with the smaller pixel QHY it's possible your image scale on the guidescope may be close enough that it works for you without a barlow.

I've seen people use barlows in the past with mixed results



On Tue, Jan 11, 2022 at 8:26 AM steven ho <StevenHoffman53@...> wrote:
I use the 10x60 Vario-Finder as a guidescope(FL is 250mm) on an AP-140 (FL 1050).
 
Would it be practical to put a 2X barlow into the "guidescope"?
 
the camera options available to me are QHY5-III178 and SBIG ST-i, both are mono.
QHY5-III178 = 2.4 µm pixel size and 1/1.8" sensor (USB3)
SBIG ST-i = 7.4 μm pixel size and 4.8 mm x 3.6 mm sensor (USB2)

Thanks for your help!!
Steven Hoffman



--
Brian 



Brian Valente


Guideascope question

steven ho
 

I use the 10x60 Vario-Finder as a guidescope(FL is 250mm) on an AP-140 (FL 1050).
 
Would it be practical to put a 2X barlow into the "guidescope"?
 
the camera options available to me are QHY5-III178 and SBIG ST-i, both are mono.
QHY5-III178 = 2.4 µm pixel size and 1/1.8" sensor (USB3)
SBIG ST-i = 7.4 μm pixel size and 4.8 mm x 3.6 mm sensor (USB2)

Thanks for your help!!
Steven Hoffman


Re: Keeping the dust out

Eric Weiner
 

For those interested, electrical tape around the CFW spacers and around the two halves of the CFW seems to be working.  At least under typical Front Range wind conditions.  I've got some gaffers tape on order to replace the electrical tape to avoid adhesive residue sticking to parts. 


Re: Image size at focal plane of an 155f7 EDFS

marsh.family
 

A follow-up question for those who have used a mono-camera in a light polluted urban environment.

 

To date I’ve been using a colour camera with a narrow band filter.  I’ve had moderate success and was very surprised by the ambient light suppression.  To the point where it was easy to capture images on almost any clear night.

 

Now considering a mono camera, I’m wondering if anyone can share how the LRGB filters work in such an environment.  Or does the moon and ambient light become a much bigger concern? 

 

Thanks for your thoughts,

 

Regards,

 

Chris

 

From: main@ap-ug.groups.io <main@ap-ug.groups.io> On Behalf Of Roland Christen via groups.io
Sent: January 10, 2022 6:10 PM
To: main@ap-ug.groups.io
Subject: Re: [ap-ug] Image size at focal plane of an 155f7 EDFS

 

The 2.7" focuser will not vignet. The 36mm filter will vignet quite a bit. You will need a field flattener in either case.

 

Roland

 

-----Original Message-----
From: marsh.family <marsh.family@...>
To: main@ap-ug.groups.io
Sent: Mon, Jan 10, 2022 3:32 pm
Subject: [ap-ug] Image size at focal plane of an 155f7 EDFS

Hi, hoping for some insight

I am considering a new camera/filter wheel and am wondering with the 2.7" focuser whether there would be vignetting for a full frame sensor.  Also, I'm wondering whether a 36mm filter would be wide enough to not vignette the light from the objective should I choose a full frame sensor. Or does one need the 2" filter.

Thanks,

Chris


Re: Image size at focal plane of an 155f7 EDFS

marsh.family
 

Thanks for the advice – it’s much appreciated.

 

Regards,

 

Chris

 

From: main@ap-ug.groups.io <main@ap-ug.groups.io> On Behalf Of Roland Christen via groups.io
Sent: January 10, 2022 6:10 PM
To: main@ap-ug.groups.io
Subject: Re: [ap-ug] Image size at focal plane of an 155f7 EDFS

 

The 2.7" focuser will not vignet. The 36mm filter will vignet quite a bit. You will need a field flattener in either case.

 

Roland

 

-----Original Message-----
From: marsh.family <marsh.family@...>
To: main@ap-ug.groups.io
Sent: Mon, Jan 10, 2022 3:32 pm
Subject: [ap-ug] Image size at focal plane of an 155f7 EDFS

Hi, hoping for some insight

I am considering a new camera/filter wheel and am wondering with the 2.7" focuser whether there would be vignetting for a full frame sensor.  Also, I'm wondering whether a 36mm filter would be wide enough to not vignette the light from the objective should I choose a full frame sensor. Or does one need the 2" filter.

Thanks,

Chris


Re: Image size at focal plane of an 155f7 EDFS

Roland Christen
 

The 2.7" focuser will not vignet. The 36mm filter will vignet quite a bit. You will need a field flattener in either case.

Roland

-----Original Message-----
From: marsh.family <marsh.family@...>
To: main@ap-ug.groups.io
Sent: Mon, Jan 10, 2022 3:32 pm
Subject: [ap-ug] Image size at focal plane of an 155f7 EDFS

Hi, hoping for some insight

I am considering a new camera/filter wheel and am wondering with the 2.7" focuser whether there would be vignetting for a full frame sensor.  Also, I'm wondering whether a 36mm filter would be wide enough to not vignette the light from the objective should I choose a full frame sensor. Or does one need the 2" filter.

Thanks,

Chris


Re: Image size at focal plane of an 155f7 EDFS

 

2.7” = 68.6mm, so vignetting won’t be a problem. The diagonal of a full frame sensor is 36mm x 24mm, or 43mm, so 36mm filters would vignette. I use 2” filters for my full frame cameras, without any problems. 


Image size at focal plane of an 155f7 EDFS

marsh.family
 

Hi, hoping for some insight

I am considering a new camera/filter wheel and am wondering with the 2.7" focuser whether there would be vignetting for a full frame sensor.  Also, I'm wondering whether a 36mm filter would be wide enough to not vignette the light from the objective should I choose a full frame sensor. Or does one need the 2" filter.

Thanks,

Chris


Re: The Crab Nebula in SHO

skester@...
 

Thanks all for the positive feedback!


Re: The Seagull and the Seven Sisters.

skester@...
 

Love the colors on that Seagull Alex, beautiful result.

Scott


Re: The Seagull and the Seven Sisters.

Karen Christen
 

Wow, Alex.  Those are striking.

Karen

AP

 

From: main@ap-ug.groups.io <main@ap-ug.groups.io> On Behalf Of Alex
Sent: Monday, January 10, 2022 2:09 AM
To: main@ap-ug.groups.io
Subject: [ap-ug] The Seagull and the Seven Sisters.

 


After weeks of crap weather, I finally got a clear night which allowed me to finish a couple images.  

First off is the Seagull Nebula.

https://www.astrobin.com/f3ef8x/

I also grabbed some subs of the Pleiades while waiting for the Seagull to rise high enough.

https://www.astrobin.com/ucor2c/

Alex


Re: The Seagull and the Seven Sisters.

Roland Christen
 

That is a fine image of the Seagull!

Roland

-----Original Message-----
From: Alex <groups@...>
To: main@ap-ug.groups.io
Sent: Mon, Jan 10, 2022 2:09 am
Subject: [ap-ug] The Seagull and the Seven Sisters.


After weeks of crap weather, I finally got a clear night which allowed me to finish a couple images.  

First off is the Seagull Nebula.

https://www.astrobin.com/f3ef8x/

I also grabbed some subs of the Pleiades while waiting for the Seagull to rise high enough.

https://www.astrobin.com/ucor2c/

Alex


Re: The Seagull and the Seven Sisters.

Ray
 

Awesome!  gorgeous image

Ray


Re: The Seagull and the Seven Sisters.

Stuart
 

What a great shot Alex!!!

Stuart 

On Mon, Jan 10, 2022 at 3:09 AM Alex <groups@...> wrote:

After weeks of crap weather, I finally got a clear night which allowed me to finish a couple images.  

First off is the Seagull Nebula.

https://www.astrobin.com/f3ef8x/

I also grabbed some subs of the Pleiades while waiting for the Seagull to rise high enough.

https://www.astrobin.com/ucor2c/

Alex


Re: The Seagull and the Seven Sisters.

Pete Lardizabal
 

Spectacular imagery Alex.

😎

Pete

On Jan 10, 2022, at 3:09 AM, Alex <groups@...> wrote:


After weeks of crap weather, I finally got a clear night which allowed me to finish a couple images.  

First off is the Seagull Nebula.

https://www.astrobin.com/f3ef8x/

I also grabbed some subs of the Pleiades while waiting for the Seagull to rise high enough.

https://www.astrobin.com/ucor2c/

Alex <seagull_nebula copy.jpg>


The Seagull and the Seven Sisters.

Alex
 


After weeks of crap weather, I finally got a clear night which allowed me to finish a couple images.  

First off is the Seagull Nebula.

https://www.astrobin.com/f3ef8x/

I also grabbed some subs of the Pleiades while waiting for the Seagull to rise high enough.

https://www.astrobin.com/ucor2c/

Alex


Re: Solar filter for 92mm Stowaway

midmoastro
 

https://www.astro-physics.info/tech_support/accessories/solar_acc/filter-size-chart.pdf

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