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ONAG at work:

Guiding with a long focal

The images below are 1 minute (bin 1x1) unprocessed luminance frames taken with an Apogee U8300 (5.4x5.4 microns) at prime focus of a Hyperion (f =2.54m @ f/8).
Both have been cropped the same way.
Field of view: 224x224 arcsec near NGC 2683.

There are 38 minutes apart.
credit: Frank Colosimo
Blue Mtn Vista Observatory

Mount: Paramount ME
Guider: ONAG+SBIG ST402
Seeing: Average

The reference star is marked with a cross (not the guide star).


 demo

Initial image (t=0'), reference star:
FWHM=2.44 arcsec
Centroid X=80.71 Y=171.83 pixel

 

Star 3D profile (Maxim DL) 

 


 

2nd image (t=38'), reference star:
FWHM=2.36 arcsec
Centroid X=81.38 Y=171.40 pixel

The reference star is offset by 0.79 pixels.
With the U8300 pixels (0.43x0.43 arcsec) this translates to 0.34 arcsec.
This is a total offset including all sources of error.

Below both images have been combined, without any registration and alignment, to provide an easy estimation and visualization of the total tracking performance.



Average image, reference star:
FWHM=2.43 arcsec
Centroid X=81.08 Y=171.54 pixel


Star 3D profile (Maxim DL) 

The result shows no visible guiding effect.

To know more about guiding error
and near infrared (NIR) visit:

How much guiding error is too much?

Guiding with NIR

   

Heavy duty focuser:

Full body compressing ring

The ONAG features a low profile 1.25" guider focuser (GF) associated with a T-thread (M42 x0.75mm) and integrated with the ONAG's X/Y stage.

It has been designed to remove any possible flexure even with a heavy camera. The focuser uses a full length compressing ring mechanism made of high grade 6061 aluminum alloy. It applies a considerable pressure (on 360 degrees) all the long the focuser drawtube insuring a constant and efficient grip.

As a matter of fact when the focuser screw is hand tighten the all system is as rigid as an unique solid piece of aluminum.

The next image shows the full body compression ring element and its screw.

GF compressing ring alone

Unlike thumb screws used with low cost systems, the stain less steel focuser screw compresses the all focuser body against the drawtube. The mechanism is lubricated with an extended temperature range anti-seize grease. It is designed with 2 groves and set screws to insure the drawtube will not leave the focuser by accident.

Should you want, or need, to use any 1.25" nosepiece just remove the set screws and replace the focuser drawtube by your  piece of equipment. A very handy solution if your guider camera nosepiece does not come off.

Below the compressing ring with the focuser drawtube in place.

GF compressing ring and drawtube


 

 

 

 

Products

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On-axis guider ONAG

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Hot product 2012 S&THot product 2012 S&T


The ONAG comes in standard with 3 T-thread (M42 x 0.75mm) extension tubes (8, 16, and 24 mm), as well as a 2" and SCT to T-thread adapters.

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Product Specifications:

without extension tube

Over all dimensions:

123 x 92 x 83 mm

ONAG weight:

770 g

Imager back focus:

66 mm

Guider back focus, half way extended:

90 mm

X/Y stage, full X travel:

37 mm

X/Y stage, full Y travel (excepted low profile):

28 mm

X/Y stage, maximum off-axis offset:

23 mm

X/Y stage maximum exploration circle:

46 mm

Low profile SCT adapter thread:

2” 24 tpi

Low profile SCT adapter ring inner depth:

12.5 mm

Low profile SCT adapter back focus:

7.5 mm

2” tube adapter outside length:

30 mm

2” tube adapter back focus:

0 mm

Guider focuser type:

Compression ring

Guider focuser travel:

9 mm

Scope port:

T-thread (M42 x 0.75)

Imager port:

T-thread (M42 x 0.75)

Guider port:

T-thread (M42 x 0.75)

T-threaded extension tubes outside:

Fully knurled

T-threaded extension tube useful lengths:

8, 16, 24 mm

Dichroic beam splitter coating:

Fully multi-coated

Dichroic beam splitter protection (both sides):

Optical grade quartz

Dichroic beam splitter reflection (visible):

> 95%

Dichroic beam splitter visible range:

> 370 nm to 750 nm

Dichroic beam splitter transmission (NIR):

> 90%

Dichroic beam splitter NIR range:

> 750 nm to 1200 nm

Anodizing:

Black, low reflection

Anodizing spectral range (R < 2%):

500 nm to 2500 nm

Anodizing outgassing:

None

Download the user manual

SBIG AO-8 adaptor plate

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Allow to connect the ONAG to the SBIG AO-8 adaptive optic unit.

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Product Specifications:

IF provides the adapter based to SBIG specifications (http://sbig.com/sbwhtmls/online.htm) and can not be held responsible to any possible changes made by SBIG to their product that could impact the interface between the ONAG and the OA-8. Please visit SBIG for the latest information http://sbig.com.
Adjustable focal reducer AFR

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Adjustable focal reducer AFR


IF provides a near infrared (NIR) optimized adjustable focal reducer (AFR) made with aspheric optics.
This reducer is used with your guider when you want to place a focal reducer/corrector in front of your imager, at the ONAG's imager port (IP).

The AFR allows your guider to reach focus with a short optical path at the ONAG's guider port (GP). It increases the guider FOV as well.

The AFR works with most FRs, including the Celestron, Meade 0.63x, 0.33x, Starizona SCT corrector, Optec, ...

See the FAQs section and the ONAG user manual in our website for further information.

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For further information, contact us at:

 +1-215-885-3330, FAX: +1-215-884-0418, or email

 
Male SCT - female T-threaded adapter

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Male SCT to female T-threaded adapter


IF provides a male SCT to female T-threaded adapter for connecting the ONAG imager port (IP) to products such as filter wheels, focal reducers, or camera bodies using a female SCT thread. 

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For further information, contact us at:

 +1-215-885-3330, FAX: +1-215-884-0418, or email


Custom ONAG's adapters



Should you need any specific adapter for using the ONAG with your equipment
Innovations Foresight is partner with PreciseParts to offer you a solution for virtually any scopes, cameras, accessories, and set-ups, just visit:

 
ONAG adapter solutions

 

 Or contact us at:

 +1-215-885-3330, FAX: +1-215-884-0418, or email

 
 

 

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