Zooming in without a lens
- planecrazzzy
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Zooming in without a lens
There are no lenses or Barlow ... So how do you zoom in ?
I'm saving up for a Cooled , Mono , Color wheel and maybe auto focus.
Probably close to $2500 bucks.
But I've wondered just how does it work.... Is it done through the computer ?
Gotta Fly...
- OzEclipse
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Re: Zooming in without a lens
You can increase the focal length of a compound telescope like an
Joe
Amateur astronomer since 1978...................Web site : http://joe-cali.com/
Scopes: ATM 18" Dob, Vixen VC200L, ATM 6"f7, Stellarvue 102ED, Saxon ED80, WO M70 ED, Orion 102 Maksutov, ST80.
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Re: Zooming in without a lens
For my
DSO AP: Orion 200mm f/4 Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,Oiii,LRGB filters; KWIQ/QHY5 guide scope; Planetary AP: Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on HEQ5 pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome; iOptron CEM60 (pier); Helena Observatory (H2O) Astrobin
- planecrazzzy
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Re: Zooming in without a lens
Thanks
- Gfamily Online
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Re: Zooming in without a lens
So if you were using a full frame 35mm camera, the image would be similar to what you'd see through a 35mm eyepiece.
A smaller sensor would give you something like a shorter focal length eyepiece.
Star Adventurer
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Re: Zooming in without a lens
Various eyepiece designs can have widely different apparent fields of view [AFOV] varying from 40 to 100 degrees so this rule of thumb doesn't really make sense.Gfamily wrote: ↑Sat Mar 23, 2024 5:10 pm A rule of thumb is that diagonal across the sensor gives you an idea of what an eyepiece would see.
So if you were using a full frame 35mm camera, the image would be similar to what you'd see through a 35mm eyepiece.
A smaller sensor would give you something like a shorter focal length eyepiece.
The visual magnification M is
M = [Telescope Focal Length] ÷ [Eyepiece Focal Length]
The True Field of View TFOV is
TFOV =
The photographic field of view PFOV of a telescope is easily calculated
PFOV = 57.3 x [Sensor Dimension] ÷ [Telescope Focal Length]
Always use the same units for measurements in the formulae eg focal length in mm, sensor size in mm.
For example, with a 1000mm focal length, an APSc sensor diagonal has a 1.6 degree field while a full frame has a 2.35 degree field. A 31mm Nagler, one of the widest field eyepieces has a 2.5 degree field of view but an average 30mm Plossl will only have a 1.6 degree field. Easiest thing is to just do the calculations to work out true angle of view.
Joe
Amateur astronomer since 1978...................Web site : http://joe-cali.com/
Scopes: ATM 18" Dob, Vixen VC200L, ATM 6"f7, Stellarvue 102ED, Saxon ED80, WO M70 ED, Orion 102 Maksutov, ST80.
Mounts: Takahashi EM-200, iOptron iEQ45, Push dobsonian with Nexus DSC, three homemade EQ's.
Eyepieces: TV Naglers 31, 17, 12, 7; Denkmeier D21 & D14; Pentax XW10, XW5, Unitron 40mm Kellner, Meade Or 25,12
Cameras : Pentax K1, K5, K01, K10D / VIDEO CAMS : TacosBD, Lihmsec.
Cam/guider/controllers: Lacerta MGEN 3, SW Synguider, Simulation Curriculum SkyFi 3+Sky safari
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Re: Zooming in without a lens
It gives you a starting point.
Obviously, different
Star Adventurer
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www.midcheshireastro.co.uk for astro company
- planecrazzzy
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Re: Zooming in without a lens
This is something I was thinking about... with a electronic filter wheel...
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Re: Zooming in without a lens
planecrazzzy wrote: ↑Tue Apr 02, 2024 12:47 am https://www.highpointscientific.com/zwo ... asi533mm-p
This is something I was thinking about... with a electronic filter wheel...
This is how you would see the Moon with that camera using different telescopes with focal lengths of 660mm 1000mm 2800mm.
You can put your actual telescope into the First Light Optics Astronomy Tools.
Graeme
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Re: Zooming in without a lens
Cheers,
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- planecrazzzy
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Re: Zooming in without a lens
JayTee wrote: ↑Tue Apr 02, 2024 7:06 pm I don't mean to dampen your spirit, and what I'm about to tell you can be disregarded, but with your limited experience starting with a mono camera and filter wheel is like being put in the middle of a whirlpool in the middle of the Pacific Ocean when you don't know how to swim. Can you survive, maybe, will it be fun, probably not. There are easier routes to start your AP journey.
Cheers,
I probably need to find a club to get a better idea about it.... So far it's online searching...
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Re: Zooming in without a lens
planecrazzzy wrote: ↑Fri Apr 05, 2024 12:22 am I probably need to find a club to get a better idea about it.... So far it's online searching...
Most of us started with a visual set up. A lot of the complications of astrophotography are easier if you are already familiar and proficient using your telescope.
Then when you move into astrophotography most would recommend starting with a colour camera, either a
There is an excellent colour version of the camera you listed:
https://www.highpointscientific.com/zwo ... asi533mc-p
The ASI533 has a square sensor and so produces a square image rather than the usual rectangular. There's a few here that use one.
Have you got, or got your eye on any particular telescope yet?
Graeme
Celestron 9.25 f10 SCT, f6.3FR, CGX. Sky-Watcher Evostar-120, HEQ5
ASI1600MM Pro, ASI294MC Pro, ASI224MC
ZWO EFW, ZWO OAG, ASI220MM Mini.
APM 11x70 ED APO Binoculars.
https://www.averywayobservatory.co.uk/
- planecrazzzy
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Re: Zooming in without a lens
The other was Mono gives better results... So that's why I choose a filter wheel... auto or not...
Spending alot of money on these ? yes... but skipping the cost of the cheaper stuff to get to this...
In the long run , that's saving money....
Basically it's learning the computer...
My Telescopes guiding and tracking are in place... Just add camera
Cooled
Mono
Filters
So with THOSE three .... What's the suggestions ?.... Anything else I don't want to hear.
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Re: Zooming in without a lens
https://telescopes.net/zwo-asi1600mm-co ... undle.html
.
This is what I really want.... the 1600.... So I thought I WAS starting slow .... By the time I save the money...
I probably WILL buy this one
I don't know why anyone would say not to...
.
Yes.... it will take some learning.... That's what I'm here for.
.
Gotta Fly...
.
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Re: Zooming in without a lens
Will you be using a separate guide telescope or an off axis guider?
Graeme
Celestron 9.25 f10 SCT, f6.3FR, CGX. Sky-Watcher Evostar-120, HEQ5
ASI1600MM Pro, ASI294MC Pro, ASI224MC
ZWO EFW, ZWO OAG, ASI220MM Mini.
APM 11x70 ED APO Binoculars.
https://www.averywayobservatory.co.uk/
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Re: Zooming in without a lens
My system....It has star plates and locates itself ...By phone or computer... Then it locates and tracks...
Right now I'm mainly looking for a house before I set things up again....Meanwhile I keep throwing money into a savings account set aside for the Camera and accessories to go with it.... I think everything else is in place.
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Re: Zooming in without a lens
I followed your link... Nice observatory... and great links for different subjects......HelpfulGraeme1858 wrote: ↑Sun Apr 14, 2024 11:27 pm That's the camera and filter set I'm using.
Will you be using a separate guide telescope or an off axis guider?
Graeme
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Re: Zooming in without a lens
planecrazzzy wrote: ↑Sun Apr 28, 2024 12:49 am I followed your link... Nice observatory... and great links for different subjects......Helpful
Glad you liked it!
We have a similar list of links here on the Forum:
viewtopic.php?t=30344
Graeme
Celestron 9.25 f10 SCT, f6.3FR, CGX. Sky-Watcher Evostar-120, HEQ5
ASI1600MM Pro, ASI294MC Pro, ASI224MC
ZWO EFW, ZWO OAG, ASI220MM Mini.
APM 11x70 ED APO Binoculars.
https://www.averywayobservatory.co.uk/
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