Edge of field brightening

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August undefined, 2024

WebJul 12, 2016 · I then bought a 10mm Baader Hyperion, and when using it alone, there was a substantial amount of edge of field brightening, and the field stop was not in focus, so I tried an experiment. I added a 14mm fine tuning ring, and an empty filter cell and now the edge of field brightening is gone, and the field stop now looks to be in focus.

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WebApr 8, 2024 · A bright cloud lies at the cap's edge and a second one is seen at left. ... this created Webb's first deep field view of incredibly old and distant, faint galaxies. ... with a subtle brightening ... WebNov 20, 2006 · According to the magazine, I sum it up : the transmission of the Delos 4.5 mm appears to be slightly behind the Morpheus. This, added to extra FOV and lower cost made the Morpheus the winner for short … raytheon technologies holiday schedule

EOFB - the new eyepiece disease for neurotics - Cloudy Nights

WebJun 17, 2008 · Well, how exactly does RD, rectilinear distortion, affect the edge of the field? Well, it can have two signs: positive or negative. We usually use the terms pincushion or barrel distortion. Pincushion distortion curves straight lines near the edge by … WebAug 1, 2014 · I have a pair of 9mm T6 for binoviewing and I have not noticed the edge of field brightening that you described. Maybe in binos it is not that pronounced, I will have to check that out. With that being said, I had a pair of 11mm T6s that I used for binoviewing and I found them to be excellent but I never used them for mono viewing. WebMay 31, 2009 · Well scratch that plan -- the nosepiece barrel basically acts as the field stop. The flocking paper gave an irregular mess of a field stop. However, when I had the flocking paper on the reflective glare that almost certainly is … raytheon technologies hr contact

APM 18mm Ultra Flat Field Eyepiece - True? - Cloudy Nights

Looking for a 2 inch 82 Fvoc eyepiece - Eyepieces - Cloudy Nights

WebNov 18, 2024 · It could also be that what's really going on is centre of field darkening. After all, central rays travel through the central parts of the lenses, which are thicker. It could … WebJan 19, 2024 · The 4 longer lengths of XWs have positive field curvature, but the 40 has very little, so it should perform quite well. It doesn't quite have the edge performance of the 41mm Panoptic, but, as you mentioned, it's lighter. So we'll see how much they sell for. payner, Sarkikos and R.Kelley like this. raytheon technologies houstonWebDec 10, 2024 · The latter can affect night vision, especially in a light polluted environment and may, perhaps, be mistaken for edge of field brightening. I agree with the bolded part of your statement. I would also add that moisture lower in the atmosphere does tend to induce EOFB in every eyepiece. There has been many nights when I have EOFB in all of … raytheon technologies headquarter address

"WebNov 28, 2005 · Most eyepieces with EOFB have a narrower band around the outside of reduced contrast, and, of course, the edge is round, not square. And often the brightening at the edge is more subtle. But this comes close to the worst case I've seen, and I wanted people who have not seen it to know what it is that those of us who have are seeing. " - Edge of field brightening

Edge of field brightening

7mm Celestron Luminos - Eyepieces - Cloudy Nights

WebSep 23, 2009 · Page 1 of 3 - Eyepiece outer field brightening survey - posted in Eyepieces: I think it might be worth it to see how many people have noticed this effect and with which eyepieces. Ive commented on it a few times and there are a few people that seem to see the same thing I am seeing.The effect Im talking about can be described … WebJul 22, 2024 · The objective of this study was to evaluate long-term change in shortwave irradiance in central Arizona (1950–2024) and to detect apparent dimming/brightening trends that may relate to many other global studies. Global Energy Budget Archives (GEBA) monthly data were accessed for the available years 1950–1994 for Phoenix, Arizona and …

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WebDec 20, 2024 · 13mm--horrible, with the worst edge of field brightening I've seen in an eyepiece. Sharp enough, but who cares? EOFB might not be seen in a bright sky background, though. 8mm--just average for a low priced widefield, with a trace of EOFB at the edge and astigmatic stars 5mm--about the same as the 8mm 3.5mm--I didn't test. WebJun 16, 2004 · It is known that strong negative value of distortion derivative represents brightness increase of image. So eyepieces with corrected distortion (when distortion curve goes to be positive on half of field and then suddenly returns back to zero at FOV edge) shall have certain amount of EOFB.

WebMar 17, 2010 · The thing I'm noticing is that there always seems to be a brightening near the edge of the FOV - say the outer 10% of the field. I notice it in all of my eyepieces although least in my 24mm Brandon. I notice it with both scopes although more strongly in the Celestron achromat as compared with the Antares achromat. Web1 day ago · The field appears to be flat with no need to refocus center to edge. Stray light seems well controlled as is light scatter around bright objects like planets. They work well together as a pair in binoviewers since they are fairly light and compact. There is no noticeable kidney beaning (SAEP), other blackout types, or edge of field brightening ...

WebSep 29, 2010 · Mediocre edge quality, relative to even simple, uncorrected designs like Plossls. Uneven brightness across the field . The one bright spot was the centre was very sharp and contrasty. Very good build-quality. Far better than the crude black anodizing seen on some other eyepieces. WebMay 2, 2012 · Pros - Equal to or less than the edge performance of ES, Slightly better center performance, Less edge-of-field brightening, Possibly better contrast at least under brighter mag 5 sky conditions, Generally more eye relief than ES, Easier (for me anyway) to see the entire field-of-view, Viewing comfort very slightly better than ES, Adjustable ...

WebNov 26, 2006 · Had my 25 BST Starguider out against my 25 Meade HD60 a few nights ago to compare them and noticed the Starguider had a level of Edge of Field Brightening (EoFB) that the HD60 did not. So decided to take the Starguider apart to see if anything looked like it might be the culprit.

WebSep 21, 2013 · Field curvature is an issue with the telescope itself, a short focal length refractor or an non-Edge SCT has significant field curvature. Mark's 4 inch F/5.5 Doublet would be more than a millimeter out of focus at the edge of a 30mm UWA eyepiece. raytheon technologies indeedWebJun 10, 2015 · EOFB stands for edge of field brightening and pertains to eyepieces. It seems that certain eyepieces get brighter toward the edge of the field. I've never seen … raytheon technologies in colorado springs coWebMar 22, 2024 · The 1.25 inch ES 82 degree eyepieces claim 15 mm of eye relief but the eye lens is only 17 mm in diameter and as you say, it's recessed. At the edge of eye lens, a 82 degree eyepiece with a 17 mm eye lens can only have 10 mm of eye relief. The 28 mm UWA has a 27 mm diameter eye lens that's has minimal recess. raytheon technologies huntsville al addressWebAug 7, 2024 · Overall the 9mm expanse was the worst of the three. It had the most difficult eye placement. It had the worst edge performance and some edge of field brightening. If Agena had the BST UWA in stock I would say go with them for $55. simply meg\u0027s greensboro ncWebSep 2, 2024 · I've found the Hyperion's edges too soft, the Radian too narrow and dark, and many modest-priced 82's to be either too short on ER or suffering from edge of field brightening (I'm quite sensitive to EFOB). That seems to leave the options as: 18.2mm Delite (62*) 17.5mm Morpheus (76*) 17mm Vixen LVW (65*) raytheon technologies indeed reviewsWebJun 10, 2015 · EOFB stands for edge of field brightening and pertains to eyepieces. It seems that certain eyepieces get brighter toward the edge of the field. raytheon technologies historyWebJul 3, 2011 · EOFB stands for "Edge Of Field Brightening". The phenomenon being described is one in which the sky background across the field of the eyepiece is not uniform. Instead the background appears darker in the center than near the edges. simply me login