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77mm-DSLR-Camera-filter-unmounted-Bahtinov-Mask-FP443-0

58mm DSLR Camera filter unmounted Bahtinov Mask, FP439

$12.95 $12.95 (as of April 20, 2017, 11:18 am)


Bahtinov Focusing Mask for DSLR Camera Lenses with 58mm filter threads
Snaps into a UV or Skylight filter [NOT INCLUDED]
Works with all DSLR cameras

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Description

Focusing with your Bahtinov mask is simple. Start by snapping the Bahtinov mask into an affordable UV or Skylight filter that fits your camera lens. [FILTER NOT INCLUDED, MUST BE PURCHASED SEPARATELY] Center a somewhat bright start in your camera and achieve a rough focal point, then loosely screw the filter holding the mask onto your camera lens. Take a short exposure. The image of the star will show diffraction spikes. The “center” set will in all probability be shifted to one side or the other. This is showing the defocus. Adjust the point of interest of your camera and re-expose the star, once again showing the diffraction spike pattern. Iterate the process until you get the central diffraction spike centered against the star and the other spikes. Whilst you achieve a symmetrical pattern, you have achieved the most efficient imaginable focal point. Dispose of the mask, center your target object and take your images!
Bahtinov Focusing Mask for DSLR Camera Lenses with 58mm filter threads
Snaps into a UV or Skylight filter [NOT INCLUDED]
Works with all DSLR cameras
Best for focal lengths greater than 100mm
Made in the united states by Farpoint Astro

Additional information
Binding

Electronics

Brand

Farpoint

EAN

0022099907077

EANList

0022099907077

Label

Farpoint Astronomical Research

Manufacturer

Farpoint Astronomical Research

Model

FP439

MPN

FP439

PackageDimensions

200, hundredths-inches, 900, hundredths-inches, 19, hundredths-pounds, 600, hundredths-inches

PackageQuantity

1

PartNumber

FP439

ProductGroup

Photography

ProductTypeName

CAMERA_LENS_FILTERS

Publisher

Farpoint Astronomical Research

Studio

Farpoint Astronomical Research

UPC

022099907077

UPCList

022099907077

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