View single post by Eric
 Posted: Sun May 18th, 2014 03:25
Eric



Joined: Wed Apr 18th, 2012
Location: United Kingdom
Posts: 4186
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jk wrote:
And a quick retake at ISO200 rather than ISO3200 and then processed.
Post processing is nothing more than a convert to B&W and sharpen in Lightroom.

Eric, definitely no hotspot!!

Taken with XE1 rather than XPro1, again with Hoya R72 filter.
2.5secs, f8 at ISO200


Frankly Jonathan I wouldn't expect a hotspot from using a front mounted filter. It this were the case there would have been an outcry from the many people who use front filters of all sorts.

This is down to the way the internal filter behaves with closer proximity to the rear of the lens and the sensor.

I don't pretend to be able to explain why.

But I do remember that the 50mm f1.8 AND 1.4 primes can exhibit hotspots working normally without filters in colour mode!

I shot some black boots against white background some years back now, and got a blue fog hotspot on the boots. It was very small thought it was a boot defect but as it was catalogue work and I noticed all the boots with the same mark. Changed to the 105mm lens and the marks disappeared!

Its not until you do repetitive shots from same position and lighting that these sort of issues show up.

I have some time on my hands now so I will turn the files to jpg format on the XE and take some example shots......be prepared to be horrified!



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Eric