Pixfra Sirius S435 Thermal Imaging Monocular
384x288, 12µm, <18mK NETD, 35mm
The Pixfra Sirius S435 is a compact yet powerful thermal imaging monocular built for clear, reliable detection in the field. Featuring a 384×288, 12µm, <18mK thermal sensor, a 35mm f1.0 lens, and a detection range of up to 1,800 metres, it delivers impressive thermal performance in a slim ergonomic body. A 1920×1080 OLED display, AI-powered image calibration, 64GB built-in storage, Wi-Fi connectivity, and a quick-release 18650 battery system make it a versatile and user-friendly choice.
#1265
#1266
#1313
#1316
#1319
The Pixfra Sirius S435 is a slimline thermal imaging monocular that combines advanced performance with a streamlined, ergonomic design. Built around a 384×288, 12µm thermal sensor with an impressive <18mK NETD sensitivity, it is designed to pick up even the smallest heat signatures with remarkable clarity. Paired with a 35mm f1.0 objective lens, the Sirius S435 delivers a detection range of up to 1,800 metres, making it an excellent choice for wildlife observation, conservation work, and general thermal spotting.
Image quality is a real strength of the Sirius S435. Its AI-powered image calibration continuously learns from captured images to optimise performance in changing conditions, while the 50Hz frame rate keeps the view smooth and responsive. A 0.49-inch 1920×1080 OLED display produces a crisp, vivid image that remains comfortable to view over longer sessions, helping to reduce eye fatigue. With 2.41x optical magnification and digital zoom settings of 1x, 2x, 4x, and 8x, it offers the flexibility to observe both nearby and distant targets with confidence.
Pixfra’s signature styling gives the Sirius S435 a refined and practical feel. The monocular features a three-button control layout for simple one-handed operation, along with distinctive design touches such as carbon fibre accents, embossed details on the focus wheel, and an illuminated power button integrated into the Pixfra logo. For more discreet use, the light can be switched off completely. A metal lens cover also adds extra protection against dust, scratches, and knocks in the field.
The Sirius S435 is equally strong on features, with built-in 64GB storage, video recording, snapshot capture, Wi-Fi hotspot connectivity, and hot spot tracking all included as standard. Its quick-release 18650 battery system provides up to 6 hours of runtime, allowing batteries to be swapped quickly when needed. Finished with a robust IP67 waterproof rating, a close focus distance of 3 metres, and a lightweight build of just 421g, the Pixfra Sirius S435 is a highly capable thermal monocular that delivers serious performance in a compact package.
- Thermal Sensor 384×288, 12µm, <18mK
- Lens 35mm f1.0
- Focus Control Manual
- Close Focus Distance 3 m (9.84 ft)
- Field of View H
- Detection Range 1,800 m (5,905.31 ft)
- Digital Zoom 1x, 2x, 4x, 8x
- Magnification 2.41x
- Frame Rate 50 Hz
- Display 1920 × 1080, 0.49 inch, OLED
- Colour Palettes 6 (White Hot, Black Hot, Iron Red, Alarm, Amber, Emerald)
- Storage Built-in 64 GB
- FFC Calibration Auto, Manual, External Correction
- Hot Spot Trace Yes
- Wi-Fi Hotspot Yes
- Video Recorder Yes
- Snapshot Yes
- Power Source Replaceable 18650 battery
- Battery Life Up to 6 hours, depending on temperature
- Power Supply 5 VDC / 2 A
- Port USB Type-C
- Operating Temperature –30 °C to +55 °C (–22 °F to +131 °F)
- Protection Rating IP67
- Product Dimensions 194.3 mm × 54 mm × 65.4 mm (7.65″ × 2.13″ × 2.57″) (L × W × H)
- Net Weight 421 g (0.93 lb)
- Slimline, ergonomic design for comfortable handling during longer observation sessions
- One-handed operation enabled by a simple three-button control layout
- AI-powered image calibration that continuously improves image quality across changing conditions
- Crystal-clear viewing experience designed to provide a sharp, comfortable image with reduced eye fatigue
- Quick-release battery system for fast and easy battery changes in the field
- Built-in video recording for capturing observations as they happen
- Snapshot function for saving still images instantly
- Built-in storage for keeping recorded footage and images directly on the device
- Wi-Fi hotspot connectivity for connecting the monocular to compatible devices
- Hot spot tracking to help quickly identify the hottest point in view
- Multiple colour palettes to tailor the viewing experience to different environments and preferences
- Flexible calibration modes to maintain image consistency in varying conditions
- Manual focus control for precise image adjustment
- Protective metal lens cover to guard against knocks, scratches, and dust
- Illuminated logo power button that indicates device status with adjustable brightness settings
- Stealth-friendly operation with the option to switch the illuminated logo off completely
- Pixfra signature styling with premium design details including embossed elements and carbon fibre accents
- Durable, field-ready construction built for dependable use outdoors
- Suitable for a wide range of uses including wildlife observation, conservation, and general thermal spotting
- Pixfra Sirius S435 Thermal Imaging Monocular
What is the Pixfra Sirius S435 used for?
The Pixfra Sirius S435 is designed for thermal observation and is suitable for uses such as wildlife observation, conservation work, and general heat signature detection.
How far can the Sirius S435 detect?
It has a detection range of up to 1,800 metres, allowing it to pick up heat signatures at long distances.
What thermal sensor does it use?
It uses a 384×288, 12µm thermal sensor with a sensitivity of <18mK.
What lens does it have?
The Sirius S435 is fitted with a 35mm f1.0 objective lens.
Does it have zoom?
Yes, it offers 2.41x magnification and digital zoom settings of 1x, 2x, 4x, and 8x.
What is the image quality like?
It features AI-powered image calibration and a 1920×1080 OLED display, which helps deliver clear and detailed thermal images.
Is it comfortable to use for long periods?
Yes, it is designed with an ergonomic slimline body, a simple button layout, and a display intended to reduce eye fatigue during extended use.
Can it be operated with one hand?
Yes, the Sirius S435 has a streamlined three-button layout designed for comfortable one-handed operation.
Does it record video and take photos?
Yes, it includes both video recording and snapshot functions.
Does it have internal storage?
Yes, it has built-in 64GB storage for saving recordings and images.
Can it connect to other devices?
Yes, it features a Wi-Fi hotspot for connectivity.
Does it have different colour palettes?
Yes, it offers 6 colour palettes: white hot, black hot, iron red, alarm, amber, and emerald.
How is the focus adjusted?
The Sirius S435 uses manual focus control.
What is the close focus distance?
It has a close focus distance of 3 metres.
How long does the battery last?
Battery life is up to 6 hours, depending on temperature.
What type of battery does it use?
It uses a replaceable 18650 battery and features a quick-release battery system.
Is it suitable for harsh weather conditions?
Yes, it has an IP67 protection rating and an operating temperature range of –30°C to +55°C.
Does it have a protective lens cover?
Yes, it has a metal lens cover to help protect against dust, scratches, and impacts.
Does the power button light up?
Yes, the power button is integrated into the Pixfra logo and can glow in five brightness settings. It can also be switched off when needed.
How big and heavy is it?
The Sirius S435 measures 194.3 mm × 54 mm × 65.4 mm and weighs 421 g.
- Pixfra 3 year warranty
Our aim is to ensure that your order arrives with you as soon as possible and in the safest, most cost-effective means.
Please Note: Shipping charges may be subject to additional surcharges if out of area or over weight restrictions.
Please Note: DPD SHIPMENTS REQUIRE THE CUSTOMER TO SHOW A PIN CODE ON DELIVERY - READ MORE: HERE
COURIERS
 |
 |
 |
 |
We use DPD , RoyalMail, TNT and UPS courier services for all our orders whether dispatching to the UK or International. As soon as your order has been dispatched you will receive an email with your unique tracking number. We are unable to add delivery notes to your order regarding safe spaces or neighbour deliveries. If you require this service it can be arranged directly with the courier once the parcel is in their network.
IN-STORE ITEMS
These are items that we have in-stock and will be sent out for delivery as soon as possible. We aim to dispatch all orders within 1-2 working days, but during busy periods dispatch may be delayed by a day or so. If you would like to purchase the item in person then please call ahead to arrange an appointment: 01803 611 895.
PRE-ORDER ITEMS
These are usually items that are going to be out-of-stock for a number of weeks or are in short supply. By purchasing a Pre-Order Item you are in effect paying a deposit for your goods. As soon as the item is back in stock yours will be dispatched within 24 hours where possible. Please see individual product pages for current back-in-stock dates. In rare occasions, these dates can be changed by the manufacturers so we recommend staying in contact with Optics Warehouse depending on the product lead time.
INTERNATIONAL DELIVERY & TAXES
In addition to the above information If your delivery address is outside of the UK you may be subject to import duties and taxes, which are levied once a shipment reaches your country. Any such additional charges for customs clearance must be borne by you. You should note that customs policies vary widely from country to country. Optics Warehouse advises each customer to contact their local customs office for further information if they are in any way unsure of local duties or liabilities. Cross border shipments are subject to opening and inspection by customs authorities which means some packages may be opened and re-sealed.
NEED HELP?
If you require any further assistance, please call us on 01803 611 895 or email sales@opticswarehouse.co.uk
-
A NOTE ABOUT DPD SHIPMENTS:
- Please be advised that we have now introduced DPD Pins to all DPD orders from Optics Warehouse.
- If your shipment is being sent from Optics Warehouse via DPD you will be sent a Pin Code that must be shown to the courier upon delivery.
- The pincode is sent VIA email & TEXT message. A valid email address and mobile number must be provided at checkout. Emails will be sent from "Riviera House 3PL" - if you do not receive this email please check your junk or spam folders.
- Please note that if you do not display your pin code to the courier driver upon delivery, you will not be able to have your item and you may need to schedule another delivery date to show a valid pin.
- Please view the attached slides HERE for further information!