| Joined: | Mon Aug 13th, 2012 |
| Location: | Copenhagen, Denmark |
| Posts: | 442 |
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novicius wrote:Ah that explains it , so then when the rear element is very close to the sensor there should be a hot spot , do not have that with the 55 f1.2 which has a rather large rear element very close to the sensor , have n`t noticed anything sofar , but then the slrN has no AA filter , which makes it susceptible to moir¨ tho`.
I thought that " hot spot " would only occur with Infra Red shooting and only with some old glass , according to Bj¸rn R¸rslet , I have n`t encountered that phenomina , but I have no I R kit , thinkin´ about converting either the D1 or the D1x , have n`t decided yet ,
Hotspots can occur in normal photography in the wrong conditions for exactly the same reasons as for IR.
The light reflects from the glass sensor cover/hot mirror filter onto the rear element of the lens, and back, repeatedly, if you are familiar with audio you will have heard of feedback squeal, lens hotspots might be described as an optical equivalent.
There are several of us here on the forum who take IR photographs, if you do decide to have a go, I am sure we can give you some guidance.
I definitely want to get on with IR , there `s a company in the USA that offers several kits , incl. a tutorial how to install in both the D1.. D1x ,..can n`t decide which camera t` rebuild , as the D1 has that nifty shutter , the D1x has more resolution , and which filter kit , or maybe the UV kit ,.. any recommendations ?
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