Lens type: Fisheye (Diagonal on crop sensor, Circular on full frame)
Focus type: Manual only
Aperture range: f/3 – f/22
Filter size: n/a
Dimensions (with caps on): 105mm high, 90mm wide
Height (from camera front to lens front; caps off): 85mm
Weight (with caps on): 580g / 1 lb. 5 oz.
Weight (with caps off): 524g / 1 lb. 3 oz.
Other: removable plastic lens shade
The big disappointment with this lens was moving the manual focus ring did very little in terms of changing focus. The fixed focal plane was not set to infinity, but just short of it, so the stars never really would come in to focus. For a very wide-field shot like this, it doesn’t matter too much in a single exposure until you zoom in, and can see all the stars and details are a bit blurry. I hope to modify this lens to see if I can get it to focus. If successful, I will update this review.
$160 USD (December 2020)
Opteka 6.5mm f/3.0 HD
Reader Rating0 Votes
Removable lens hood
Would not come to focus at infinity
Could not fully test lens since it wouldn't come to focus