KEY TECH­NIQUE

Sky at Night Magazine - - THE SKY GUIDE -

FIND­ING THE RIGHT BLEND

Some deep-sky ob­jects are brighter than others and to get the best pho­to­graphic re­sults from them, it’s nec­es­sary to be able to iden­tify this and ad­just your tech­niques ac­cord­ingly. M13 is one of the best glob­u­lar clus­ters vis­i­ble from the north­ern hemi­sphere and falls into the bright cat­e­gory. Take too long an ex­po­sure of it and the core will over­ex­pose to white. Ex­pose cor­rectly for the core and you’ll lose a lot of the out­ly­ing stars that re­ally bring home just how huge this ob­ject is. A high dy­namic range tech­nique al­lows you to deal with this and see both.

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