Fwiw turn the grow lights off and turn flash on to get the pic. Ive tried dimming my full spectrum lights and they never give pictures as good as camera flash. Blurples hide the sugar coating. The best way is a cheap evilbay digital microscope.
On another note. Flowering times are relative. I just chopped my amnesia autoflower Sunday night. Out of three autoflowers planted the same day. It was the "longest" flowering time. (9-10 weeks vs 8 the sour diesel and blackberry need at least another week. Theyre right on schedule. All where grown with the same canna coco/perlite mix and fox farms trio