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Astronomik ProPlanet 742 IR-pass Filter XL Clip Filter for Nikon Z
Model: ak_pp_742-ir_125Part Number: 10225125
The ProPlanet IR 742 only allows infrared light with wavelengths of more than 742 nm to pass. In this wavelength range the effects of seeing are significantly lower than in the visible spectrum of the human eye. This allows much sharper images than are usually obtained from your device and location. Another advantage is that the sky background of advanced dawn is dark and so the filter even allows photography of the planets and the Moon at daylight.
The Astronomik ProPlanet IR 742 cuts off the visible part of the spectrum and allows the light of wavelengths longer then 742nm to pass. Due to this behavior the part of the spectrum that is most sensitive to bad seeing is rejected. This approach does a big improvement to the imaging of planets and the Moon. The image is more steady than the image in the visible light with nearly identical exposure times.
When the seeing is very bad and the instrument is 10" (250 mm) or larger, the Astronomik ProPlanet IR 807 may be the better choice.
The major emission lines of artificial light pollution:| Hg 435,8nm | Hg 546,1nm | Hg 577,0nm | Hg 578,1nm || Na 589,0nm | Na 589,6nm | Na 615,4nm | Na 616,1nm |The major emission lines of nebulas:H-β 486,1nm | OIII 495,9nm | OIII 500,7nm | H-α 656,3nm
Sadly, I haven't yet been able to try this out (clouds, humidity, wind and other commitments) but the service was excellent, and it's hard to believe that the filter won't be fun to use.
I bought this filter as part of a set of four for a full spectrum converted Nikon Z6 to allow normal photography (with a UV-IR block filter) and IR photography with this IR Pass filter. As soon as I received them, I put one into the Z6 but found that contrary to the Astronomic sales video the filter dropped out at the slightest nudge of the camera. I've tried other full frame Z bodies with the same results. Yes, the filters stay put in the bodies, just, but it only requires the slightest nudge for them to drop out, I certainly cannot replicate what the video shows of multiple reasonably forceful taps without dislodging the filters. Obviously, a lens or T mount holds any filter in place so for Astrophotography or where you want to fit a lens for a whole shoot it is not a big problem. So, if you are willing to accept a loose fit they are good.Iíve watched the install video several times to check Iíve not missed anything subtle in the fitting and have tried multiple times with the same result. There are no sprung pieces on these filters that engage with the ridges in the Z body cavity, so they rely on the size being correct for an interference fit - other manufacturers Z clip-ins have a form of spring retention on the upper edge that does work.I did take the time to test and check all four filters received and as far as filter quality is concerned, they are great but fitting wise and staying in place is concerned they are no good for me. Other clip in filters, not Astronomik, fit and stay fitted fine, so, I have returned them and will buy alternatives. I've given three stars as the filter quality is good, but the fitting is not.
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