Why the Optolong L-PRO 2 filter is one of the most sought-after by astrophotographers
Those who photograph the deep sky from urban or suburban skies often find themselves searching Google for phrases like “which light pollution filter to choose”, “Optolong L-PRO 2 review”, “filter for galaxies from the city”.
The Optolong L-PRO 2 was created for this exact scenario: to reduce the impact of light pollution while maintaining natural color rendering, especially with one-shot color (OSC) cameras and DSLRs/mirrorless cameras.
What the Optolong L-PRO 2 is and what type of filter it is
The L-PRO 2 is a broad-band filter designed to attenuate the main frequencies of artificial lighting (sodium, mercury, and LED lamps) without aggressively cutting the spectrum useful for astrophotography.
This makes it a very different filter from dual-band ones: less selective, but more versatile and natural on a wide range of subjects.
When the L-PRO 2 filter really makes a difference
Deep sky photography from city skies
In the presence of bright skies, the L-PRO 2 helps to darken the sky background and improve the overall contrast of the image, making subsequent processing easier.
Galaxies and star fields
One of the main advantages of the L-PRO 2 is its behavior with galaxies: unlike very selective filters, it does not drastically alter colors and preserves the naturalness of the stars.
L-PRO 2 or dual-band filter? Let's clarify
One of the most common questions is: “is the L-PRO 2 better or a dual-band?”. The answer depends on the type of subject you are photographing.
- L-PRO 2 (broad-band): ideal for galaxies, star clusters, and star-rich fields, especially in moderately polluted skies.
- Dual-band: more suitable for emission nebulae (H-alpha / OIII), especially from heavily polluted skies.
In summary: if you often photograph galaxies and want to maintain realistic colors, the L-PRO 2 is a more balanced choice.
Recommended setup with color cameras (OSC)
The L-PRO 2 is particularly suitable for:
- cooled astronomical color cameras;
- modified and non-modified DSLRs and mirrorless cameras;
- portable setups for balconies or gardens.
A fundamental aspect: flats
When using a light pollution filter, it is essential to take accurate flats. The filter alters the light distribution, and without correct flats, obvious gradients or vignetting may appear.
What NOT to expect from a light pollution filter
- it does not turn an urban sky into a mountain sky;
- it does not replace good focus or stable tracking;
- it is not always necessary under already very good skies.
CTA: buy Optolong L-PRO 2
If you photograph deep sky from imperfect skies and want to improve the sky background without sacrificing colors, the Optolong L-PRO 2 is one of the most appreciated filters in its category.
FAQ
Is the L-PRO 2 suitable for galaxies?
Yes, it is one of the contexts in which it works best: it reduces the sky background while maintaining more natural color rendering compared to highly selective filters.
Is it needed even under good skies?
Not always. In very good skies, it may be preferable to shoot without a filter, especially to maximize the signal.
Is it also suitable for beginners?
Yes, it is one of the easiest filters to use: it does not require complex workflows and easily integrates into color setups.