Andrea B. Posted July 28, 2018 Share Posted July 28, 2018 [Filter Test SEU Gen2 #1] Introduction to the SEU Gen2[Filter Test SEU Gen2 #2] White Balance, Raw Histogram & Andrea's "White Signature"[Filter Test SEU Gen2 #3] Filter Speed & A Windy Bull's-eye[Filter Test SEU Gen2 #4] Dealing with the Usual Dichroic Effects[Filter Test SEU Gen2 #5] Landscape Interlude[Filter Test SEU Gen2 #6] Monochrome Museum Comparison[Filter Test SEU Gen2 #7] Measured Filter Transmission[Filter Test SEU Gen2 #8] Dichroic Reflection Detour[Filter Test SEU Gen2 #9A] Longpass Stack Wandering Discussion. See #9B for results.[Filter Test SEU Gen2 #9B] Longpass Stack Results[Filter Test SEU Gen2 #10] What good is a filter test without a Rudbeckia?[Filter Test SEU Gen2 #11] A Fascinating New Rudbeckian View[Filter Test SEU Gen2 #12] Summary Summary of SEU Gen2 Tests Thank you to vendor-member Reed Curry of UVR Optics for offering the new SEU Gen2 dichroic UV-pass filter to me for review. I like the filter. I'm going to buy my test copy. B) Speaking of which, there is a temporary discount on the SEU Gen2 which I want to mention to you as part of UVP's permitted one-time-announcement of a new product. Scroll down on that SEU Gen2 link I just gave you to find the price. Required Boilerplate: Ultravioletphotography.com (UVP) is an independent website which has no affiliation with any vendor of photographic gear. We are a non-monetized website. Thank you to Jonathan Crowther (JMC) for contributing Test #6 and to Ulf Wilhelmson (UlfW) for contributing Test #7. Your efforts are much appreciated. I hope all the UVP members and readers have enjoyed reading the 11 or so SEU Gen2 tests. I would like to thank you all for your comments and for your interest. I did try to provide some variety of subject matter and some different lighting conditions, but we still need a SEU Gen2 portrait. So now it is your turn, OK? Exposures times under the SEU Gen2 are faster than with other well-known UV-pass filters, all other factors being equal, because the filter's highest transmission rate, between 60-73%, is in the 370-400 nm range where sunlight provides the most UVA. This aids outdoor UV captures under hazy or overcast conditions when there is less UV reaching ground level.The SEU Gen2's 70-73% transmission between 380-400 nm is very useful for non-specialist, UV-capable lenses many of which do not reach past 370 nm or so.The SEU Gen2 nicely preserves the sharpness and detail offered by the lens in use. It is impressive on a lens like the UV-Nikkor 105/4.5 (rig on tripod, remote shutter triggering). I was not able to fully explore monochrome comparisons, but I really liked the Black & White conversions from the SEU Gen2.There is no Visible or IR leakage in photos made under a UV-cutting longpass filter (420 nm) stacked over the SEU Gen2 and given the same exposure as the UV-only frame. There is a very good transmitance chart on the product page showing the out-of-band blocking.31 October 2018 This comment has been corrected. The word "potential" has been added in two places.The SEU Gen2's potential small passage of violet light (.2% between 400-406 nm) does not affect the UV capture. We already know this from using other UV-pass filters having a potential minor passage of violet light. Light around both sides of 400nm, say approximately 390-410 nm, is recorded similarly by our cameras.The SEU Gen2 is well made. Protective screw-on caps are included in the purchase and should be used for storage to protect the mirrored surfaces.The D610-mod white-balanced false colour in a finished SEU Gen2 landscape photo is a very pleasant mix of false-blue and false-green. False-yellow may also show up in some photos. As with any other UV-pass filter, the SEU Gen2 false colours are dependent on subject distance, white balance algorithms and converter used in addition to the camera and lens used.The higher transmission peak of the SEU Gen2 at 392nm and high transmission between 380-400 nm may - for some subjects - offer a slightly different UV view than what is captured by a filter such as the BaaderU with a peak at 350 nm. This will be fun to explore further for an amateur botanist like me.Like all other dichroic UV-pass filters, the SEU Gen2 can cause concentric discoloration when used over a wide-angle lens. Interestingly, this discoloration can sometimes be mitigated in a finished photograph by converting the photo to monochrome or split-tone and perhaps also applying vignetting tools. So the SEU Gen2 is certainly not precluded from use on wide-angle lens. Any concentric dichroic effect is significantly reduced when using a lens with longer focal length such as the UV-Nikkor 105/4.5. The photographer might also consider framing the subject so that some cropping could be applied.I did not find any consistent veiling flare with the SEU Gen2 such as occurs with the hard-coated Edmund 340/10 at all apertures and at all illumination angles. However, using a lens hood, always good practice, is mandatory with a dichroic filter such as the SEU Gen2. The photographer should also have a willingness to reframe the subject to avoid confronting direct sunlight (unless flare is wanted as an artistic enhancement!).Any dichroic, mirrored filter can produce the occasional wacky outlier result. With the dichroic BaaderU, I get the occasional ring reflections of an inner lens barrel. The SEU Gen2 and EL-Nikkor 80/5.6 (old metal version) sometimes produced a doubling of a portion of a very UV-bright subject photographed against a UV-dark background. I don't know why that EL-Nikkor does that. Link to comment
Andrea B. Posted July 28, 2018 Author Share Posted July 28, 2018 [Done 2018.07.28 14:55 EDT] Please let me know of any errors, typos or confusing statements I might have written. Thanks !! :D Link to comment
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