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| Losing the low pass filter - Page 3 | |
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| Posted: Tue Feb 26th, 2013 07:45 |
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21st Post |
Robert
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The hotspot I have at f16 even in the normal, visible spectrum is more pronounced than that Eric. This crop is from the D1x Normal spectrum body, the hotspot is actually in the centre of the frame. Attachment: D1x Normal f16.jpg (Downloaded 20 times)
____________________ Robert. |
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| Posted: Tue Feb 26th, 2013 07:48 |
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22nd Post |
Robert
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This id from the D1x which does not have a low pass filter LPF Again a crop off centre. Attachment: D1x no LPF f16.jpg (Downloaded 20 times)
____________________ Robert. |
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| Posted: Tue Feb 26th, 2013 07:51 |
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23rd Post |
Robert
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Thirdly from the D1 IR converted body. This id a 1:1 crop screen grab from Lightroom. Attachment: D1 IR f16.jpg (Downloaded 20 times)
____________________ Robert. |
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| Posted: Tue Feb 26th, 2013 08:04 |
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24th Post |
Robert
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The hotspots are barely visible at f8 and undetectable below. Minor adjustments to levels and WB to equalise the exposures but otherwise un molested.
____________________ Robert. |
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| Posted: Tue Feb 26th, 2013 08:21 |
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25th Post |
blackfox
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correct if i,m wrong here robert ,but has the hot spot moved left in the bottom pic
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| Posted: Tue Feb 26th, 2013 09:49 |
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26th Post |
Robert
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blackfox wrote:correct if i,m wrong here robert ,but has the hot spot moved left in the bottom pic No Jeff the bottom pic is from the D1 and it only has half the pixels that the D1x has so I cropped it at 1:1. The tripod probably moved while I was having my lunch too.
____________________ Robert. |
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| Posted: Tue Feb 26th, 2013 11:59 |
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27th Post |
Eric
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Robert wrote: The hotspot I have at f16 even in the normal, visible spectrum is more pronounced than that Eric.I appreciate that... but you used the 50mm lens....which, no disrespect, is a £200? lens. The 24-70 is a £1200 lens...and frankly its not good enough to have a weakness like this. Sure we rarely use f16, but that's not the point. IMHO there is an optical defect, that compromises the full range of its potential. Interestingly my oooooold 28-70 AFS which I (fortunately) kept.... doesnt have a hotspot. Similarly the 80-200AFS I used in my test is clear. So not a step forward then?
____________________ Eric |
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| Posted: Tue Feb 26th, 2013 12:35 |
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28th Post |
Robert
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The 50 1.4 and 1.8 were the standard 35mm film lenses, and considered at the time to be pretty good, they were not designed for digital, which wasn't even on the horizon at the time. Even so I don't think cost is really a factor, more the reflective glass in front of the sensor. Film wasn't reflective, a factor which also messed with TTL flash. Where is Kirk? 
____________________ Robert. |
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| Posted: Tue Feb 26th, 2013 14:21 |
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29th Post |
Eric
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Robert wrote:The 50 1.4 and 1.8 were the standard 35mm film lenses, and considered at the time to be pretty good, they were not designed for digital, which wasn't even on the horizon at the time. I totally agree its the amount (maybe type) of glass. But the point I was making was...if they charge £1200 for a lens they need to have overcome these issues. My 28-70 and 80-200 predate digital, have plenty of glass in line and yet don't have hotspots.
____________________ Eric |
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| Posted: Tue Feb 26th, 2013 15:53 |
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30th Post |
jk
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blackfox wrote: correct if i,m wrong here robert ,but has the hot spot moved left in the bottom pic That is what I thought as well. However if Robert says No then he should know as he took the pictures.
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
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