Askar SQA55 Quintuplet Refractive Astrograph (SQA55) energy rejection filter Often called a Nebular or

Often called a Nebular or ALP (anti-light pollution) filter

The slots drilled along or vertical to the length provide more possible spacing so the users may have more options and versatility in practical attachments

and 1/4”-20

Introducing the HEM44 and the HEM44EC

When the lens tube is contracted

Askar SQA55 Quintuplet Refractive Astrograph (SQA55) energy rejection filter Often called a Nebular orIntroducing the Askar SQA55 55mm f 4. 8 Petzval Astrograph, where precision optics meet cutting edge design to redefine astrophotography. Engineered for celestial enthusiasts and professionals alike, this revolutionary lens combines the classical Petzval design with modern optical advancements, delivering unparalleled clarity and breathtaking detail in capturing the wonders of the night sky. SQA55 Features Petzval Lens Structure: Self flattened