DayStar Filters QUARK Краткое руководство по эксплуатации - Страница 9

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Exposure time:

Imaging solar vs. nighttime astrophotography is very different. Dark sky

imaging requ ires lo ng exp osure time s to capture e nough light. Solar

imaging offers a mple light , so expo sures should be very short.

fluctuations in seeing dictate that short <1/10 second frame rates will be

better, a s seeing cells mo ve quickly to distort th e im age a nd can come

and go during a long exposure.



Short exposure webcam imagers are better than l ong exposure

CCD cameras when imaging the sun.



Because the sun ha s a range of

exposure doesn't work well. A softwa re interface that allows the

user to control the exposure settings manually is very important.

Exposures for promi nences taken th rough a DayStar with a we

style camera might be ab out 1/15 – 1/ 100

surface detai l woul d be even shorte r exposure with about 1/ 300 to

1/500

of a second.

Bit depth:

Solar activity encompasses a wide dynamic brightness range from bright

solar flares to faint eruptive or floating prominences quite a distance from

the solar limb. In order to capture all these features, we recommend the

use of 1 2 bit or 16 bit cameras. No rmal 8 bit came ras can be u sed, but

will typically only be able to image ei ther the surface or prominences,

necessitating multiple

recombination in a computer. 12 bit or 16 bit cameras enable capturing

these features in the same exposure, simplifying the image processing.

Focal reducers:

Because of the long effective focal length at the outp ut of the Qua rk, the

image scale will be quite l arge and small (1/2" o r below) image sensors

will only ca pture a fractio n of the whole sola r disk in one fram e. Larg e

pixel sizes (9 microns and above) will enable a larger field of view.

Alternatively, a focal re

between th e Quark an d th e came ra. Simple 1.2 5"

screw in focal redu

camera nosepiece to allo w a wider field of view wit h

small (1/2", 1/3", ¼"

distance b etween the focal re

surface will result in more focal

bracke

ted expo

ducer can be em ployed

cers can be atta ched to the

) sensor cameras. Mo

ducer and came ra

r eduction and l arger fiel d of view.

brightnesses, automatic

of a se cond. Exposure s for

sures and

Plus,

bcam

bsequent