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Pixfra Sirius S635 Thermal Imaging Monocular
The Pixfra Sirius S635 Thermal Imaging Monocular combines exceptional image clarity with a refined, ergonomic design that remains comfortable for accurate heat detection from distances up to 1800 metres.
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Key Features
- 640x512, 12µm thermal sensor with =18mK NETD
- 35mm f1.0 objective lens with up to 1800m detection
- 2.41x maximum digital magnification
- 0.49” 1920x1080 OLED display
- Streamlined ergonomic design with three-button layout
- Illuminated logo power button with 5 brightness levels
- Quick-release battery system with up to 6 hours runtime
- Metal lens cover for added protection
Pixfra Sirius S635 Thermal Imaging Monocular Summary
The Pixfra Sirius S635 is a high-performance thermal imaging monocular that combines exceptional image clarity with a refined, ergonomic design. It features a pro-grade 640x512, 12µm thermal sensor with =18mK NETD sensitivity and a powerful 35mm f1.0 objective lens, delivering sharp detail and accurate heat detection up to 1800 metres away.
A 0.49” 1920x1080 OLED screen provides a clear and comfortable viewing experience, helping reduce fatigue during extended use. With a maximum 2.41x magnification, distant objects can be inspected in greater detail, whether observing wildlife or monitoring movement at long range.
The S635 includes Pixfra’s signature styling, with carbon fibre accents, an integrated logo power button, and a compact three-button layout for intuitive one-handed operation. It’s lightweight, robust and designed for practical outdoor use. The quick-release battery system supports up to 6 hours of use per charge, allowing fast swaps to stay out for longer. For those looking for a compact yet capable thermal solution, the Sirius S635 delivers professional-grade results in a highly portable form.
Pixfra Sirius S635 Thermal Imaging Monocular in More Detail
High-Sensitivity Thermal Sensor
The Sirius S635 is built around a 640x512, 12µm thermal sensor offering =18mK NETD sensitivity, which allows for clearer, more defined imaging even in poor conditions. Combined with a fast 35mm f1.0 lens, it can detect and display distant heat signatures up to 1800 metres away. A maximum 2.41x digital magnification helps reveal greater detail at long range.
OLED Display for Comfortable Viewing
Its 0.49” OLED screen provides a full-HD 1920x1080 resolution image, offering a broad and immersive view of the scene. The crisp visuals reduce eye strain, making the S635 suitable for extended viewing sessions in the field.
Refined Build and Operation
The design reflects Pixfra’s attention to usability, with carbon fibre-style detailing, a metal lens cap for protection, and a simplified button arrangement for quick access to settings. The backlit power button is integrated into the Pixfra logo and can be dimmed or turned off when observing in complete darkness.
Quick-Swap Battery
The Sirius S635 uses a fast-release battery mechanism, supporting up to 6 hours of operation per charge. Extra batteries can be carried for continuous use without needing to pause or find a charging point.
What's in the Box
- Pixfra Sirius S635 Thermal Imaging Monocular
Thinking of choosing finance?
Finance is a great way to spread the cost of your purchase. To make it easy we have teamed up with Omni, one of the UK’s leading finance specialists, so that you can apply for and complete a loan application quickly, easily and informatively.
Omni Capital Retail Finance Ltd which is a credit provider/ lender regulated by the Financial Conduct Authority whose finance options are best suited for you and your purchase.
Simply add the items you love to your basket. Once you are at the checkout select the finance option that suits you and choose Omni. The quick application form is simple and should take no more than a couple of minutes to complete and you will receive a decision instantly. Easy!
Use our finance calculator to check the impact of various loan values, terms and interest rates on the total amount you need to pay and the monthly repayments.
Representative example:
Buy a £1,200.00 camera and pay a 10% deposit of £120. You'll borrow £1,080 over 24 months with an annual interest rate of 14.9% (fixed) with a first payment of £52.04 followed by 23 monthly repayments of £51.83. The total amount payable will be £1,244.13 14.9% APR Representative.
Finance available See options |
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Check your eligibility
To be considered for finance, you will need to meet all of the following criteria:
- Are at least 18 years old
- Are in regular full or part-time employment (minimum 1 hour per week or £10,000 income per annum), unless you are retired and receiving a private or company pension, or you are in receipt of disability living allowance
- Are a permanent UK resident and have lived in the UK for at least 3 years
- Have a UK bank account capable of accepting Direct Debits
- Have a good credit history with no late payments, Debt Relief Orders, County Court Judgments or bankruptcies.

Please note that, due to calculations, your monthly repayment may differ very slightly from what you were expecting. Please check your monthly repayment figure before proceeding
Missed or late payments will result in fees and additional interest on your loan and can also affect your credit file and your ability to obtain credit in the future.
Credit is subject to status, UK only, 18+
Park Cameras Limited is a credit broker, not a lender and is authorised and regulated by the Financial Conduct Authority (FRN 680161). We do not charge you for credit broking services. We will introduce you exclusively to finance products provided by Omni Capital Retail Finance Ltd.
Omni Capital Retail Finance Ltd which is a credit provider/ lender regulated by the Financial Conduct Authority, Firm Reference Number: 720279. For more information please go to www.omnicapitalretailfinance.co.uk/contact/customer or visit www.omnicapitalretailfinance.co.uk.
Find out more about paying with finance here and Omni Capital Retail Finance Ltd terms here
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Condition guide
Our used products are subject to wear and tear in comparison to brand new products. This also applies to accessories that are supplied with the camera including batteries which may have a lower optimum performance level/life expectancy.
- Like New – The equipment is in a condition as if you have just bought it from the manufacturer. The item is still considered to be ‘Like New’ even without the original packaging and accessories. The product has been fully tested and is in perfect working order. Lenses are optically clear. There may be light dust present that will not effect the imagery.
- Excellent – The equipment should be close to being ‘Like New’ but there may be some small cosmetic blemishes that lower its grade. The product has been fully tested and is in perfect excellent order.
- Cameras – Should have no marks on the LCD screen
- Lenses – Should have no marks on the elements and optically clear. There may be light dust present that will not effect the imagery.
- Very Good – The equipment may have some slight cosmetic wear to the paintwork and cosmetic blemishes with only light signs of use and the product has been fully tested and is in great working order.
- Cameras – The LCD screen may have small signs of wear that does not affect its display
- Lenses – The mount of the lens will start to show signs of wear
- Good – The equipment is showing more obvious signs of cosmetic wear and blemishes, but the product has been fully tested and is in great working order.
- Cameras – LCD screen may have scratches or wear that is starting to affect the display.
- Lenses – May have slight dust inside that does not affect images. The mount shows signs of use.
- Well Used – The equipment will show significant signs of wear. The paintwork will be coming away in large areas exposing the metal work, but the product has been fully tested and is in great working order.
- Cameras – LCD screen is heavily worn either by de-lamination or has scratches to it. Rubber grips are starting to come away from the body.
- Lenses – The lens has dust inside that may affect images. The rubber zoom/focus ring is coming away from the barrel of the lens.
*All of our used items are listed with the accessories that are included. If they are not listed, then they will not be supplied at the point of purchase.
Peace of mind with our 6 month warranty
This product has been thoroughly tested by our team of photographers and we are happy to give a 6 month warranty as a result. The number of tests depends on the individual product but we are confident in this product having tested all the major functions. Anything that isn’t as you would expect, we then make a note of and show this in the condition notes on the page.
So you can be confident you are buying a great piece of kit that’s been looked after by a fellow photographer and seen many extraordinary sights, tested by our team of photographers and now looking forward to being set free to capture more great images!