DayStar Filters QUARK Quick Start Manual - Page 8

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Solar Imaging Tips:

Daystar

recommends

MONOCHROME

imaging

possible for best results.

The recent availability

CCD came ras and DSLR

cameras has o ffered a

simple op

portunity for

solar ob servers t o imag e

the Sun in Hydroge

Alpha with a Digital SL R

camera. Ple ase b e advi sed, ho wever, that due

monochromatic light and it s effe cts o n a CCD came ra, certain ne gative

effects are likely to occur.

The DSLR i mager mu st be a ware t hat mo st ca mera manufacturers

(Canon a nd Nikon) u se a n IR blocking filter which greatly re duces the

transmission of Hyd rogen Alpha light. DSL R cameras without this IR

blocking filter will have better sensitivity imaging in Hydrogen Alpha.

The imag er shoul d also app reciate that even after co

blocking filters, that the COLO R CCD chip i s con structed in a way that

only 1 in 4 pi xels detect red light. The other 3 sensors only detect blue

and green b ecause the p ixels are a ctually perm anently covere d with a

colored dye for each corresponding color. So a co lor CCD chip (in a

DSLR o r a CCD camera) will only offer 1/4 the sensitivity and 1/2 the

resolution of a monochrome chip.

in afterm arket adapte rs of fer a si mplified solution f or th e i ssue. This

effect is a concern for both color and monochrome sensors.

An optional accessory is available from DayStar (MG-0408) which can be

used between the DSLR and Quark to adjust the lig ht angle and extinct

the interference pattern.

CCD

whenever

Another eff ect pre sent in CCD i

monochrome light of Hydroge

interference pattern -

effect is similar to interference testing of an optical

surface b etween two flat surfa ces. The sen sor

and cover slip cause a small interfe rometer inside

the came ra and cau se a Newto n's Ring moire'

pattern. The CCD chip m ust be tilted to a mino r

degree to p revent this pa ttern. Recent advances

to the nature of

nsidering IR

n Alp ha is the

or Ne wton's Rings.

maging of

The