Pier 4

Sigma Art 105mm f/3.2 Ultra-Widefield Lens

Telescope

Sigma 105mm F/1.4 ART lens stopped down to F/3.2 when combined with the ZWO ASI-2600MC Pro OSC APSC sensor this has a crop factor of 1.5 which gives an effective focal length around the 160mm mark.

We could use this lens wide open but stopped it down because of potential filter bleed issues as well as it tightens up the corners a small amount, it’s an exceptionally well corrected lens that will deliver stunning detail that requires ridiculously short exposures.

Pier-4 is a fast Unguided system

The telescope is F/3.2 and is fitted with a low noise CMOS camera set to unity gain, even the dimmest object can be imaged with subs of this length. if you book subs longer than this Roboscopes will contact you to alter them to more suitable lengths that suits the system!

CMOS Camera

Just in case you have never used CMOS and have been using CCD like the rest of us for the last million years then let me tell you it requires a different approach, you can forget long subs as the are not needed and at most times detrimental to your image quality. Allowing for CMOS’s sensitivity, higher dynamic range and super low read noise broadband imaging typically 30/60s and 120s is more than ample enough for narrowband, you just needs a lot more of them of course.

The ZWO ASI-2600MC Pro Colour CMOS is one of Sony's new generation zero ampglow sensors, so no need to worry on that count :)

This camera is set to Unity Gain as our default, if you have any special gain and offset requirements for CMOS imaging please discuss and we will do our best to accommodate you.

Equipment List

Telescope	Sigma 105mm F/1.4 Art Lens Stopped down to F/3.2
Mount	Paramount MX
Camera	ZWO ASI-2600MC Pro Colour CMOS 1x1 Binned
Filter Wheel	N/A
Filters	N/A
Guide Camera	ZWO ASI-120 Mini - 1x1 Binned (Back-up not used)
Guider	ZWO Mini Guide Scope
Focuser	Astromechanic Lens Focusing System
Power Control	HitecAstro MHP V4

Sony IMX571

Back illuminated CMOS Sensor
23.5x15.7mm
6248x4176pixels
3.76µm

Bayer Matrix Parameters

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12.82° x 8.57°
7.64 "/px @ 1x1 Binning
101.7mm Focal Length
F/3.2
20º Imaging Horizon Limits
Camera Position Angle: 179°

Recommended sub lengths

Broadband Imaging

	Filter	Bright	Dim
	OSC	60-60s	120-300s

Imaging subjects with brighter cores will of course require shorter sub lengths for HDR, your personal experience will be needed to gauge this yourself.
Please remember this is only a guide above, we are just trying to help you have the best experience possible remote imaging with Roboscopes.
Although we have taken Bias frames we do not recommend using them with CMOS sensors.
Roboscopes supply the site and control the equipment but you choose everything else from filters, object/co-ordinates to sub lengths. So you need to exercise due diligence and experience when booking because if you fill the booking form out with incorrect details then you will get precisely that.
It is not Roboscopes responsibility to check your detailed requirements after you have booked. Basically garbage in garbage out!!

Filter weights

Get accurate star colours with recommended colour balance

	Filter	Weight
	Red	N/A
	Green	N/A
	Blue	N/A

Calibration Files

The following calibration files are available as standard with this system. Other darks are available upon request.

5s Darks
10s Darks
20s Darks
30s Darks
45s Darks
60s Darks
90s Darks
120s Darks
180s Darks
240s Darks
300s Darks
Flat Frames

Field of view examples

Image courtesy of Roboscopes member Mark Large

M16 The Eagle Nebula

M31 The Andromeda Galaxy

M42 The Orion Nebula

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Planewave

10 Micron

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Company Details:

Roboscopes

802 Kingsbury Road
Birmingham
B24 9PS
United Kingdom

Pier 4

Sigma Art 105mm f/3.2 Ultra-Widefield Lens

Telescope

CMOS Camera

Telescope

Camera

Mount

Telescope

Camera