How much does this cost to the nearest dollar?

Optolong L-Extreme 7nm Dual Narrowband Filter (H-Alpha and O-III) (2 )
The Optolong L-eXtreme is a 7nm dual-bandpass filter which can be used with one-shot color cameras like DSLRs and CCD/CMOS astrophotography cameras. It is also more suited for fast systems. The convenience and cost effectiveness of this filter allows amateurs to image emission nebulae even in bright, light-polluted or moonlit skies. The L-eXtreme isolates the H-Alpha and Oxygen III nebula emission lines so that the contrast and signal-to-noise ratio of the nebulae are maximized. For people who are imaging in very light polluted areas or when the moon is out, the

Price is $306.00

Price: $306