Most Common Cause Of Flashing Check Engine Light

but it is unsettling to have the upstream light flashing

Most of my caps are the slip-on type that's more common in large-format stuff, but I got these for some of my vintage Nikkors. I use a combination of a custom step up ring from SK Grimes and a B+W filter then I cap them with these caps. These look very slick, and they work well. I've tried some of the cheaper more generic brands, and these Nikon caps have smoother edges, have less wiggle, fit more flush, and have small details like the fact that the pinch flats taper outwards slightly so your fingers don't slip off the caps when you pick them up or remove them that make them so much better to use if you're busy and have things to do. Many vintage rangefinders have cloth shutters, so you can just cover the lenses with this to protect them when you're out and around.

Step-up rings are a common tool for fitting lenses and filters of different sizes. Most any will do, but some are better than others. Good thread fit is essential, but that's usually achieved. What the PRO Sensei rings add is a slight knurl-like grip which can be a help when unscrewing sticky filters. (Hint: don't over tighten them in the first place!)

The possibilities with this light are amazing. You should check it out.

This is a very nice headlamp, without two levels of white light, a red light and a flashing red light.  Having the battery pack on the back makes it much easier to balance and the straps are adjustable over a wide range.

Great size, love the built in light (it has flashing mode for some reason, just if you need to give someone a seizure on a film set?) I have always wanted this Porta Brace bag but kept talking myself out of it. I finally pulled the trigger on buying one and I'm glad I did. Sometimes I have a small lens in it if i am shooting an event with a smaller camera, but on a full set I kit it out with all the tools I'll need. for camera department. If you are on the fence about it, do it.

This flashing is amazing. The variable light settings to the strobe. No concerns on purchasing the light at all. I would love to give one to every person in my family. BUY IT YOU'LL LOVE IT!!!!

Very useful product because it is not like the regular flash. It has several functions that allow you to change such like: dimmer, lighter and even flashing. The flash level is used still not has a very strong light like regular flash. The image looks more nature light and hard to tell that is use flash or not.

With the press of a button-focus, zoom (variable), and flashing light showing camera is filming. It is so easy, light weight, hook up in seconds. This is a must have item. At the cost is inexpensive compared to the older version of this kind of equipment. Good investment and will make you smile.

Works as advertised! It's responsive and easy to use. My only minor complaint is the flashing blue light which can be a little annoying in a dark venue But, I realize there has to be some way to know that it's on