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Optolong Venus-U Filter 1.25"

Name: Optolong Venus-U Filter 1.25"
Brand: Optolong
SKU: OPL-VENUS1
Price: 189 EUR

The Venus-U filter makes it possible to obtain photographs, CCD, CMOS or video images in the UV-A (320-400 nm) and observe Venus’ cloud structures.

high transmission at pass-band

quality glass substrate, quality finish (fine-optically polished), quality coating

comes with protective box

Manufacturer: Optolong

Product number: OPL-VENUS1

EUR 189,00

incl. 19 % VAT (DE)

The VAT indicated refers to that applicable in Germany. After logging in, the VAT amount is adjusted to the applicable VAT of the stored delivery country. Therefore, the final price may vary accordingly.

excl. 6.95 € shipping costs (DE)

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Optolong Venus-U Filter 1.25"

The Venus-U filter makes it possible to obtain photographs, CCD, CMOS or video images in the UV-A (320-400 nm) and observe Venus’ cloud structures.

high transmission at pass-band

quality glass substrate, quality finish (fine-optically polished), quality coating

comes with protective box

Details..
Technical data..
In the box..
Reviews..

Optolong Venus-U Filter 1.25"

The Venus-U filter makes it possible to obtain photographs, CCD, CMOS or video images in the UV-A (320-400 nm) and observe Venus’ cloud structures.

Use with monochrome CCD/CMOS cameras and you need to remove the cover glass of sensor and internal UV-IR blocker in order to pass UV light. The same holds true for mono DSLRs that its built-in low pass filter needs to be removed. What’s more, you need a special UV lens together with camera body. All-reflecting telescopes like Newtonians and RCs (without corrector) will also work if the reflective layers are made of aluminum. The sensor of CCD or CMOS cameras is capable of detecting light in the 350-1100 nm range.

WARNING: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.

Coating Parameter

Multi-layers anti-reflection coating

Non-cementing optical substrate coating

Electron-beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL (central wavelength) no deviation affected by temperature change.

Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and optical density of off-band.

Substrate:	High-quality optical glass from Germany
Thickness:	2.0 mm
Surface Treatment:	Fine-optically polished
Surface Polish Quality:	60/40 (Refer to MIL-O-13830)
Surface Quality:	1/4 wavefront and < 30 seconds parallelism over the both surfaces
Transmission:	80% maximum transmission at spectral region 320-370 nm
Blocking:	Precision off-band blocking on ultraviolet wavelength 200-280 nm, visible and infrared spectral region
Cell:	1.25" filter cell
Clear aperture:	26 mm

Filter

Protective Box

Which side of the filter needs to face towards the telescope?

Optolong has a good explanation on their page with a check on unmounted filters. With mounted filters, it´s easy. The side with the external thread must face the camera.

Link to iOptron page: Should Optolong filters be installed in a certain orientation? (external link)
You can download the generated PDF from our own server.

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