Dust in a Teleconverter and it's effects

auspentax · 10-14-2011, 09:06 PM

I sometimes use a 2x converter on my K100d, not very often as I reckon it softens things a bit, but handy sometimes.
Now my question is, if the converter has dust specks in it, will these be visible at twice normal size in the picture ?
At the moment I'm using a 18-200mm Sigma zoom, if I aim this at the sky either zoomed or wide, no specks are
noticable in the picture.
Enter the converter and many spicks and specks appear, so my thinking is that the dust is in the converter as all is
fine without it.
So if the image comes through a nice clean lens, through a maybe dusty converter and onto a clean sensor, do you
think the dust in the converter will affect or show in the image.

Adam · 10-15-2011, 06:14 PM

Generally you can only see dust that's on the sensor - at least that's been my experience!

Basie · 10-16-2011, 08:20 AM

It would be the same as dust or fingerprints or whatever on any of the reflective and refractive surfaces that is away from the focal plane (sensor) and will not show up directly on pictures, but would manifest with lower contrast, flare and maybe even reduced sharpness

10-14-2011, 09:06 PM	#1
auspentax Junior Member Join Date: May 2010 Location: Melbourne Posts: 42	Dust in a Teleconverter and it's effects I sometimes use a 2x converter on my K100d, not very often as I reckon it softens things a bit, but handy sometimes. Now my question is, if the converter has dust specks in it, will these be visible at twice normal size in the picture ? At the moment I'm using a 18-200mm Sigma zoom, if I aim this at the sky either zoomed or wide, no specks are noticable in the picture. Enter the converter and many spicks and specks appear, so my thinking is that the dust is in the converter as all is fine without it. So if the image comes through a nice clean lens, through a maybe dusty converter and onto a clean sensor, do you think the dust in the converter will affect or show in the image.

10-15-2011, 06:14 PM	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,594	Generally you can only see dust that's on the sensor - at least that's been my experience! Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Pentax K-7 Dust Alert and Dust Removal Functions	brosen	Pentax DSLR Discussion	9	02-09-2016 04:43 AM
Filter effects from the K-5	PALADIN85020	Pentax K-5 & K-5 II	3	11-08-2010 12:01 PM
What effects is this?	PNTXFTW12	Digital Processing, Software, and Printing	8	09-02-2010 09:35 AM
Help with lighting effects??	Sara Hanna	Pentax DSLR Discussion	12	08-07-2010 01:55 PM
Effects of TC on aperture?	Kguru	Pentax SLR Lens Discussion	24	08-02-2010 02:20 PM

10-16-2011, 08:20 AM	#3
Basie Pentaxian Join Date: Aug 2011 Location: Windhoek, Namibia Photos: Gallery Posts: 989	It would be the same as dust or fingerprints or whatever on any of the reflective and refractive surfaces that is away from the focal plane (sensor) and will not show up directly on pictures, but would manifest with lower contrast, flare and maybe even reduced sharpness

Thread Tools	Search this Thread
	Search this Thread: Advanced Search