Optolong L-Pro Filter 2" Nebula Filter for Astrophotography

The L-Pro filter improves the contrast of deep-sky objects and reduces the sky background.

♦ blocks UV and IR (700 - 1100 nm)

♦ high transmission at passband

♦ improved color balance for DSLRs and One-Shot Color Astro Cameras, e.g. ASI Color Cameras cooled or uncooled by ZWO.

♦ high optical quality

♦ in 2" filter cell

♦ The L-Pro Nebula filter permits roughly 3x longer exposure times than without a filter and therefore improves contrast significantly.

 

Optolong L-Pro Filter 2"

These filters allow for astrophotography close to a city and deliver optimal results. Optolong L-Pro nebula filters cause a significant contrast enhancement and therefore enable longer exposure times with DSLRs, color and mono astro cameras.

The exposure time can be multiplied by a factor of 3. This means, that you are able to expose three times as long than without a filter, before the sky background becomes visible. On the contrary, the light which the nebula emits passes unhindered. This results in a significant contrast enhancement and makes nebula photography possible, where it otherwise would not, even close to cities. Galaxy and cluster photography also greatly benefits from the L-Pro.

 

Substrate:	High-quality optical glass
Thickness:	1.85 mm
Surface Treatment:	Fine-optically polished
Surface Polish Quality:	60/40 (Refer to MIL-O-13830)
Surface Quality:	1/4 wavefront
Transmission:	approx. 95% at passband
Cell:	Filter cell 2", black anodized, laser engraved
Clear Aperture:	45 mm
Cell height:	5 mm without external thread, 7 mm with M48 external thread