Because of the color shift that may occur due to the wide spectrum of light cut by the filter, using Kenko Astro LPR Type I for photographic purposes is not recommended. Images will require serious post-processing work to correct color balance of the image. For photographing use we suggest using Kenko Astro LPR filter Type II that is designed for this purpose.
Notes: Before using Kenko Astro LPR filter Type I we recommend to obtain basic knowledge about astronomic filters.

 Why you need astronomic filters?

Often, long exposure images of the night sky are of low contrast or highlighted. This happens due to the light coming from nearest city or different sources of artificial light (for example, street lamps).

Astro filters depending on type and purpose of use can eliminate those unwanted lights thanks to the specific features of filter coating aimed to cut off unnecessary span of light spectrum.

Every astronomical filter has its own purpose of use and differs by specifications or light transmittance characteristics.

Light transmission

According to the graph below, Kenko Astro LPR filter Type I transmits only 3 main light spectrums that come from the comet - green, red and blue. Red graph reveals the light transmission of Kenko Astro LPR Type I. White graph shows light spectrum of the comet. As you can see, spans of spectrum that are transmitted by filter are covering the light peaks that are reflecting from the comet thus providing clear and natural view.

Coating technology

Kenko Astro LPR Type I adopts precision coating based on Ion Assisted Deposition technology. In order to achieve the desirable coating specification each coating layer is sprayed on the surface of the filter with the help of ion particles creating coherent multilayer surface more durable, more harder comparing with the common coating.

The filter transmits OIII, Hβ, C2 coma, HII, H alfa, CN and C3 factors thanks to its band-pass technology.

 Limitations

Because of the color shift that may occur due to the wide span of light spectrum that is cut off by the filter using Kenko Astro LPR Type I for camera shooting is not recommended. Color balance has to be corrected by software that might be difficult and low performance routine. For camera shooting Kenko Astro LPR Type II can be used instead. Kenko Astro LPR Type II is modified for astrophotography and its coating prevents color shift.
    Because of the color rampage that might occur in peripheral areas of the image due to the coating specifications, Kenko Astro LPR Type Iis not recommended using with middle or wide angle SLR lens.

We recommend using Kenko Astro LPR Type I with SLR lenses focal distance of whose is 100mm or more (converting 35mm film).

Below are the examples shot with wide angle SLR lens (16mm) showing the result of color shift in peripheral areas of the image.