eric_bowles1

The other common error could be your nose or check is hitting the AF selector button. That's a common issue on some of the Nikon cameras and for people who shoot with their left eye.

<p>Sorry about the late response, but wanted to clarify a bit.<br> It depends on your camera and the amount of reflected light.<br> Modern sensors - such as my D800E - have about 14-15 stops of filtering of IR light on the sensor. This is a tested result comparing exposure times on a converted IR camera with a filter to an unconverted camera. <br> An IR filter such as the R72 blocks visible spectrum below 720nm - all the visible spectrum. But blocking is a relative term. If you are using a conventional camera in bright sun, you may get some light leakage through the viewfinder or the distance scale. Be sure to shade the camera and cover the viewfinder during the exposure to prevent light leakage.<br> Live View and Auto Focus won't work with an R72 filter on a conventional digital camera. It works great on a converted camera.<br> With a current camera in bright sun, I'd expect exposure times in the 15-30 second range at base ISO with an 81C filter (an 810nm filter that is for pure IR spectrum). You can increase ISO for a faster shutter speed. You'll have to try some test images and look at the histogram. You may have some light leakage in the red spectrum - some visible light - and that would shorten exposures. <br> The R72 filter will allow a little visible spectrum to pass through, so I would expect a 2-3 second exposure as a starting point. The exposure is likely to be dominated by leaking red light from the visible spectrum since the sensor blocks 14 stops of IR and your filter does not block the 700-730nm range of barely visible spectrum very effectively. You want visible spectrum with a 720nm filter - it's just that it dominates IR on an unconverted camera. (Blocking 10 stops of visible light with an R72 filter is 99.9% - it's just that you still have 10 times more visible light than IR in your image. This is known as false IR since it is mainly red light.)<br> There is a big difference in exposures with less than full sun. Subject matter does make a difference as it influence reflection of IR spectrum. Bright green foliage or synthetic fabrics are highly reflective of IR spectrum.</p>

<p>Sorry, but it does not work. The problem is you'll have a filter edge showing. You might get away with an edge in the middle of the image if you hand hold the filter and move it around enough, but the technique is difficult. <br> If you ever try handholding a filter, you'll see how easy it is to see a filter edge.<br> Just buy a Reverse Grad ND filter. Most of the major vendors sell reverse filters. They are very helpful to block brighter light on the horizon around sunrise or sunset. The work better with a level horizon or a level cloud layer.</p>