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  • Newton 300CF f4 Newton 300CF f4

Newton 300CF f4

Product code: N300CF4

Quick Overview

The Newton 300CF f4 telescope with carbon fiber tube is a great telescope for long-exposure astrophotography: the large diameter combined with the low focal ratio makes it ideal for those who want to record even the faintest objects. Recommended with EQ8 type mounts (load capacity at least 40 Kg), thanks to the large diameter it can be used with great satisfaction even by those who want to make visual use. Large diameter and great optical quality make it excellent also for lunar and planetary photography at high magnification.

Diameter is important: when we want to photograph the smallest details of the planets, using a large diameter telescope makes the difference. In addition, to record the weaker nebulae or galaxies, a fast focal ratio is recommended to avoid too long and too difficult exposure times. The Newton 300CF f4 telescope offers all of this along with other first-class features. Telescope collimation and optics test included in the price!

Availability: available on request in 40 days

Order €3,850.00
VAT 22% incl.
if you pay by bank transfer €3,734.50
Free shipping product


Newton 300CF f4 reflector, 300mm diameter, 1200mm focal length (f4), carbon fiber tube, OrionOptics (UK) UltraGrade optics lambda/10, 2" Hybrid-Drive focuser with 1:11 fine focus, PLUS support rings.


The Newton 300CF f4 telescope offers all of this along with other first-class features.

Carbon fiber tube, rigid and lightweight

Our Newton 300CF f4 telescope is made of a carbon fiber tube, lighter and more rigid than the classic aluminum tubes. By reducing the weight of the optical tube, the mount on which it is installed can deliver more precise tracking (essential for astrophotography). The high rigidity of the construction allows to maintain perfect alignment of the optics while the very low thermal expansion coefficient of the carbon helps to maintain the position of the focal plane during long exposures.

Built with the utmost attention to detail, this optical tube features a beautiful glossy finish outside and matte finish inside, to minimize unwanted reflections.





Certificated optics lambda/10 Ultra Grade

Buying a Newton 300CF f4 telescope you are guaranted of the utmost optical quality. The optics are in fact made in England by OrionOptics and are supplied with a Zygo optical report that certifies the high quality. Compared to other similar telescopes of same diameter, our Newton 300CF f4 offers higher brightness and contrast.

One of the parameters most commonly used to indicate the quality of a mirror is the correction in fractions of lambda (in simplified terms, the lower the value, the better the mirror quality): if cheap telescopes hardly reach lambda/4 and mid-range telescopes usually offer optics with lambda/5-6, our Newton 300CF f4 telescope is equipped with OrionOptics Ultra Grade optics with with lambda/10 optical correction! Other important technical values (which the majority of manufacturers of telescopes does not provide because too difficult to reach) are a Strehl ratio with typical values around 99% and RMS values of the order of 0.02PV.

What does all this mean? Better pictures, more contrasted and rich in details that will allow you incredible performances.



Mirrors with 97% reflectivity for brighter images

Usually normal telescopes mirrors have a reflectivity that can hardly reach 90%. This means that, with a Newton telescope equipped with 2 mirrors, only some 80% of the light reaches the CCD camera or the eye of the user. Our Newton 300CF f4 telescope is equipped with HiLux optical coating that increases the reflectivity to at least 97% across the visible spectrum! This feature allows the Newton 300CF f4 telescope to provide brighter images than other similar instruments of the same diameter.

Further advantage of the HiLux coating is the duration in time: in fact, thanks to the incredible protection that this coating provides to optics, your telescope will not show the decrease of performance that is usually known in cheap instruments, even after several years!

Precison mechanics for mirrors support cells

The best optics require high mechanical precision to deliver maximum performance and maintain (or make it easier) collimation. In order to do this, our Newton 300CF f4 telescope uses anodized aluminum primary cells made with high precision CNC machines. The 9 points mirror holder uniformly distributes the weight of the mirror throughout the cell. The cell is completely anodised not only to provide protection to the metal against corrosion but also to reduce the risk of scratches.

The primary cell has 3 fans (12V) which, when turned on, significantly reduce the risk of fogging and decrease the time of acclimatization of the primary mirror (the telescope provides the best performance when the mirrors temperature reaches the ambient temperature).

The precise collimation system allows to maintain the collimation longer compared to other telescopes. The collimation is also easier to perform thanks to the mechanical precision with which the cells are built.



Hybrid-Drive 50,8mm focuser

Often the Newtonian telescopes are provided with Crayford focusers suitable for visual use but not for astrophotography. In fact, during the long exposures required by astrophotography, this type of focuser can cause camera slippage moving the sensor out of focus. For this reason we have chosen to provide our Newton 300CF f4 telescope with the new 50.8mm Hybrid-Drive focuser that adds, under the focuser tube, a rack and pinion thereby maintaining in position even heavy cameras (capacity of up 8 Kg). Below the focuser there's also a locking screw: closing it, you will be sure that your camera will not move any more!

The 50.8mm Hybrid-Drive focuser presents the connection for 50.8mm and 31.8mm accessories (comes with a handy 31.8mm reducer). It also features a convenient 1:11 fine focus gear, particularly useful when you need to focus at high magnification (for example, when photographing the Moon or planets).

The focuser body has a low profile and the focus point exits 65mm from the focuser. In this way it is possible to use many photographic instruments such as digital SLR cameras or CCD cameras with filter wheels or filter wheels. For visual use, a convenient extension built into the focuser allows a quick extraction of the focuser tube to reach focus with eyepieces (without requiring an additional extension).

PLUS system support rings:

Forget about the uncomfortable and weak support rings that are often found in cheap telescopes! Our Newton 300CF f4 telescope comes with beautiful aluminum anodized support rings, made with high precision CNC machines, which are part of the PLUS (Prima Luce Universal System). This system allows you maximum freedom in adapting the telescope to your requests, and at the same time, it has all the threaded holes, holes and slots suitable for connecting all the PLUS compatible elements.

For example, you can choose to install either a Losmandy or Vixen plate type, or you can use the holes in the upper part of the rings to install a telescope in parallel (through the guide rings PLUS compatible) or a second bar equals to one located below the telescope (to position where you prefer want guide rings or to allow the sliding Vixen + Losmandy dovetail clamp).

The security of your purchase: Q-certified

We often hear users are not sure about purchasing: the telescope is collimated? The operation has been verified? Does the focuser work?

For this reason, we have developed Q-certified, a comprehensive control system that we perform in our laboratory prior to shipment and delivery of the product you ordered. In fact, in addition to providing the Newton 300CF f4 telescope with a Zygo certificate on the quality of the optics, we test the collimation and the perfect functioning of all mechanical components.

In addition, we pay much attention to shipping, carrying a sturdy packaging and giving the package to the courier service. We want to be sure that you will receive your new Newton 300CF f4 not only in the shortest possible time but also with utmost care.

NEWTON 300CF f4 reflector - equipment:

- NEWTON 300CF f4 optical tube (D: 300mm F:1200mm f/4)

Carbon fiber tube

50,8mm Hybrid-Drive focuser with 31,8mm reducer and 1:11 fine focus

Aluminum support rings, CNC machined, part of the PLUS system

Finder support shoe



Wizard Nebula (NGC7380) recorded by Daniel Beyeler with NEWTON 300CF f4, SBIG STF 8300c camera and LPS filter.



Crescent nebula (NGC6888) recorded by Daniel Beyeler with NEWTON 300CF f4, SBIG STF 8300c camera and LPS filter.

Technical specifications

Optical Design Newton
Optics Parabolic mirror
Diameter (mm) 300mm
Focal Length (mm) 1200mm
Focal Ratio 4
Field flattener/corrector Not included (optional)
Optical Tube Carbon
Secondary Mirror Obstruction 25
Focuser 2" Crayford, micrometric
Eyepiece holder 50,8mm with 31,8mm reducer
Weight 22
Hard/soft case No

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  1. 300CF Newton - big, bright, beautiful review by Daniel on 9/5/2015

    The tube is big, really big. But it is just still handy enough that I heave it any time when a clear sky lures. Particularly, as soon as I have seen the bright picture which this reflector delivers - really bright, with a breathtaking richness of well resolved details. By the way, there will not be a lack of suitable stars for off-axis-guiding any more, also supported by a perfectly tuned coma-corrector, which I ordered together with the scope. It keeps the stars in shape until out to the prism of the off-axis-guider. This is considerably beyond the image field of my mid-size-ccd (KAF8300 sensor). The entire combination offers a field-diagonal of 65 arcmin. That’s just enough for M33 or the Leo Triplet. If using a DSLR, note that the backfocus of 55mm leaves no space for other adaptations (e.g. oag) between the corrector and the M48-ring of the camera.
    This powerful newton is a winner in meteorologically underprivileged regions and will collect enough light for an impressive picture in less than 2 hours, just before fog and clouds return. And finally, it is a beautiful telescope with a flawless finish, excellently assembled from best parts. Congratulations to the team, which produced it, and thanks a lot for the always great support.

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