Problems with lens?

hadgo · 6th of May 2012 (Sun)

I have the pentax 50mm f2 reversed on extension tubes. Before that I was using the nifty fifty and it was fine. This gets me close but I seem to get a haze type effect sometimes like this

weird effect by Tom Hadgett, on Flickr

It is bugging me as I don't know what to do, this is my set up which has been working great with the nifty fifty

Macro Setup by Tom Hadgett, on Flickr

1 - Pringles can diffuser
2 - Body
3 - 49mm of extension tubes
4 - Reverse ring
5 - Pentax 50mm f2

Any help?

tonylong · 7th of May 2012 (Mon)

Gosh I don't know -- if it were me I'd do a whole series of bracketed MF shots -- it looks to me like you are maybe just not nailing your focus, but without seeing some shots with something definitely in focus, well then I just down know whether there are IQ problems or not!

LordV · 7th of May 2012 (Mon)

Wondering if you might be getting some light from the flash directly hitting the lens. Is this setup shorter than with the nifty fifty?
Brian v.

hadgo · 7th of May 2012 (Mon)

It is shorter and the flash hangs over the lens. I have cut it back today so it is behind to see if that help. The nifty fifty's front element is deep set back so I guess that helps it but with the pentax reversed its on show. I did test it out on a picture of a leaf and I didn't get any haze. I am going to take a picture of my eye again to see if it works.

hadgo · 7th of May 2012 (Mon)

This is a picture of a tarantula spiderling shed. It is in focus but I get this haze again. I tried with my eyes after I cut it back and it was still there but not as much. It is more prominent on the out of focus area but still there on the in focus areas.

Lens problem by Tom Hadgett, on Flickr

iLvision · 7th of May 2012 (Mon)

LOL! funny DIY setup... creative... money saver :P

hadgo · 7th of May 2012 (Mon)

Quote:

Originally Posted by iLvision

LOL! funny DIY setup... creative... money saver :P

hahaha less that £35 wish it would work though. The nifty fifty on the end of it gets super sharp pictures

tonylong · 7th of May 2012 (Mon)

Try it without the flash. Flash can do funny things to macro shooting. If the haze goes away without the flash, then you'll want to work on ways of, well, dealing with that, maybe getting the flash off-camera in creative ways.

If it's not the flash, well, hmm...keep testing!

hadgo · 7th of May 2012 (Mon)

I does keep happening, I think it has something to do with the aperture blade cause reflections when stopped down. It is really bugging me and I don't think I can do anything about it

gmillerf · 7th of May 2012 (Mon)

Those extension tubes don't have any flocking in them and cause the brighter spot in the center of your second image. Add some felt and it'll help. But there's certainly something else going on too, and I'm with everyone else, it seems to be glare from the flash.

hadgo · 7th of May 2012 (Mon)

Quote:

Originally Posted by gmillerf

Those extension tubes don't have any flocking in them and cause the brighter spot in the center of your second image. Add some felt and it'll help. But there's certainly something else going on too, and I'm with everyone else, it seems to be glare from the flash.

But I put it on live view and there is still something there? No flash is happening then?

gmillerf · 8th of May 2012 (Tue)

I would still start with adding some felt inside the extension tubes. It might all be due to the lack of flocking. Or try it without the tubes at all.

Your two images look a bit different as far as the haze is concerned, but the second one looks exactly like what you get when you have light bouncing around inside the optical pathway.

6th of May 2012 (Sun)	#1
hadgo Member Join Date: May 2012 Location: Newcastle - Under - Lyme Posts: 69	Problems with lens? I have the pentax 50mm f2 reversed on extension tubes. Before that I was using the nifty fifty and it was fine. This gets me close but I seem to get a haze type effect sometimes like this weird effect by Tom Hadgett, on Flickr It is bugging me as I don't know what to do, this is my set up which has been working great with the nifty fifty Macro Setup by Tom Hadgett, on Flickr 1 - Pringles can diffuser 2 - Body 3 - 49mm of extension tubes 4 - Reverse ring 5 - Pentax 50mm f2 Any help? __________________ Gear Canon 550d : 18-55mm IS II : 50mm 1.8 II : 70-200mm f4L : 17-40mm f4L

7th of May 2012 (Mon)	#2
tonylong ....winded Join Date: Sep 2007 Location: Vancouver, WA USA Posts: 47,196 IMAGE EDITING OK	Re: Problems with lens? Gosh I don't know -- if it were me I'd do a whole series of bracketed MF shots -- it looks to me like you are maybe just not nailing your focus, but without seeing some shots with something definitely in focus, well then I just down know whether there are IQ problems or not! __________________ Tony Two Canon cameras (5DC, 30D), three Canon lenses (24-105, 100-400, 100mm macro) Tony Long Photos on PBase Wildlife project pics here, Biking Photog shoots here, "Suburbia" project here! Mount St. Helens, Mount Hood pics here

7th of May 2012 (Mon)	#3
LordV Macro Photo-Lord of the Year 2006 Join Date: Oct 2005 Location: Worthing UK Posts: 46,029 IMAGE EDITING OK	Re: Problems with lens? Wondering if you might be getting some light from the flash directly hitting the lens. Is this setup shorter than with the nifty fifty? Brian v. __________________ http://www.flickr.com/photos/lordv/ http://www.lordv.smugmug.com/ Macro Hints and tips http://photography-on-the.net/forum/...d.php?t=807056 Canon 20D, Canon 40D, Canon 5D mk2, Sigma 105mm EX macro, Tamron 90mm macro, Canon MPE-65,18-55 kit lens X2, canon 200mm F2.8 L, Tamron 28-70mm xrdi, Other assorted bits

7th of May 2012 (Mon)	#4
hadgo Member Join Date: May 2012 Location: Newcastle - Under - Lyme Posts: 69	Re: Problems with lens? It is shorter and the flash hangs over the lens. I have cut it back today so it is behind to see if that help. The nifty fifty's front element is deep set back so I guess that helps it but with the pentax reversed its on show. I did test it out on a picture of a leaf and I didn't get any haze. I am going to take a picture of my eye again to see if it works. __________________ Gear Canon 550d : 18-55mm IS II : 50mm 1.8 II : 70-200mm f4L : 17-40mm f4L

7th of May 2012 (Mon)	#5
hadgo Member Join Date: May 2012 Location: Newcastle - Under - Lyme Posts: 69	Re: Problems with lens? This is a picture of a tarantula spiderling shed. It is in focus but I get this haze again. I tried with my eyes after I cut it back and it was still there but not as much. It is more prominent on the out of focus area but still there on the in focus areas. Lens problem by Tom Hadgett, on Flickr __________________ Gear Canon 550d : 18-55mm IS II : 50mm 1.8 II : 70-200mm f4L : 17-40mm f4L

7th of May 2012 (Mon)	#6
iLvision User is banned from forums Join Date: Oct 2011 Location: Western pot hole city, Massachusetts Posts: 5,766 IMAGE EDITING OK	Re: Problems with lens? LOL! funny DIY setup... creative... money saver :P

7th of May 2012 (Mon)	#8
tonylong ....winded Join Date: Sep 2007 Location: Vancouver, WA USA Posts: 47,196 IMAGE EDITING OK	Re: Problems with lens? Try it without the flash. Flash can do funny things to macro shooting. If the haze goes away without the flash, then you'll want to work on ways of, well, dealing with that, maybe getting the flash off-camera in creative ways. If it's not the flash, well, hmm...keep testing! __________________ Tony Two Canon cameras (5DC, 30D), three Canon lenses (24-105, 100-400, 100mm macro) Tony Long Photos on PBase Wildlife project pics here, Biking Photog shoots here, "Suburbia" project here! Mount St. Helens, Mount Hood pics here

7th of May 2012 (Mon)	#9
hadgo Member Join Date: May 2012 Location: Newcastle - Under - Lyme Posts: 69	Re: Problems with lens? I does keep happening, I think it has something to do with the aperture blade cause reflections when stopped down. It is really bugging me and I don't think I can do anything about it __________________ Gear Canon 550d : 18-55mm IS II : 50mm 1.8 II : 70-200mm f4L : 17-40mm f4L

7th of May 2012 (Mon)	#10
gmillerf Member Join Date: Jan 2012 Posts: 116	Re: Problems with lens? Those extension tubes don't have any flocking in them and cause the brighter spot in the center of your second image. Add some felt and it'll help. But there's certainly something else going on too, and I'm with everyone else, it seems to be glare from the flash.

8th of May 2012 (Tue)	#12
gmillerf Member Join Date: Jan 2012 Posts: 116	Re: Problems with lens? I would still start with adding some felt inside the extension tubes. It might all be due to the lack of flocking. Or try it without the tubes at all. Your two images look a bit different as far as the haze is concerned, but the second one looks exactly like what you get when you have light bouncing around inside the optical pathway.

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