Nikon Camera D7500a Full Range (77637)

The small "a" in a camera model stands for "astromodified." In standard cameras, a filter is installed to reduce the red spectral range, allowing the sensor to capture colors similar to what the human eye perceives during the day. However, this filter also blocks the crucial H-alpha wavelength, which is important for capturing astronomical gas nebulae. During astromodification, this filter is removed to increase the camera’s sensitivity to red light, particularly in the H-alpha and SII ranges.

An astromodified DSLR is therefore more sensitive to these wavelengths than the original version, making it possible to photograph gas nebulae that would otherwise be difficult to capture. Because these nebulae are often very large, the full-frame sensor of a DSLR is especially advantageous for astrophotography.

Advantages of an Astromodified DSLR for Astrophotography

• Ideal for capturing extended nebulae due to the large sensor and increased sensitivity in the H-alpha range.

• Built-in computer functionality: No need for a laptop or external power supply, which means fewer cables and easier setup.

• Wide range of accessories and versatile uses.

• Monitor with LiveView for easy focusing and framing.

The astromodification is performed by AstroHobby in Italy by replacing the original Canon filter. There are several types of astromodification available:

Baader Astromodification: Uses the Baader Planetarium BCF filter, developed in Germany, which allows light from 420-680 nm to reach the sensor. This results in four times higher sensitivity to H-alpha light compared to an unmodified camera.

Super UV/IR-Cut Astromodification: Similar to the Baader filter, but with an even wider transmission range (400-700 nm), allowing the camera to capture all visible light.

Full Range Astromodification: The camera becomes sensitive to ultraviolet, visible, and infrared light starting at 300 nm. This makes the camera highly flexible-by using additional filters, it can be used for standard daylight photography, pure infrared imaging, or advanced astrophotography.

The astromodified camera is delivered with the same accessories as the original manufacturer: camera body, battery, charger, USB cable, and manual.

Please note: For astromodification, the original camera packaging is opened and the camera is tested, so the shutter count will not be zero. However, these cameras are not used; any used items are clearly marked as such in the shop.

Specifications

Capacity

• Designation: D7500