raytoei@gmail.com
Veteran
hi,
To recap: I experienced white patch in some of my outdoor photos with a FED-2 and Industar-26m.
see:
http://www.retro.ms11.net/fed2-c.jpg
http://www.retro.ms11.net/fed2-a.jpg
Some suggested weak curtains or light leaks, while other suggested flare of the lens, or even lens defect. When I checked my curtains using a torch light in pitched darkness, I could not find any white spots indicating holes.
Today, I did several tests using different positions and different lens, all in a 30mins period at Noon.
Shot Left, Middle, Right angle all at infinity focus and at the Table at close range. Repeated the tests for Industar-50 collapsible, a different Industar-26m, and a Industar-61 L/D.
I then proceeded to test Indoor shots with the same three lens but at distances 1m, 1.5m, 2m and 2.5m
The noon shots were mainly 1/500s at F/11 or F/16 while the indoor shots were 1/30s and f/2.8 except for the industar-50 which max aperture is f/3.5.
Here are the abridged versions where I cramped 3 photos for each lens in each outdoor and indoor scenario:
http://retro.ms11.net/i-50-outdoors.jpg
http://retro.ms11.net/i-50-indoors.jpg
http://retro.ms11.net/i-26m-outdoors.jpg
http://retro.ms11.net/i-26m-indoors.jpg
http://retro.ms11.net/i-61-outdoors.jpg
http://retro.ms11.net/i-61-indoors.jpg
Observations and Questions:
----------------------------------------
a. My new shiny Industar-50 is a problem kid. I am not sure if it is faulty or I did not extend the collapsible lens fully resulting in poor focus. (Can someone comment on this ?)
b. The Industar-26m seemed to flare in the outdoor photo, the first photo looked overexposed and the Sun was overhead on my left. (Or this could be a light leak due to lens change ?)
c. The Industar-61 L/D performed the best, the first photo was accidentally overexposed, ( I changed lens and forgot to set the aperture). (The first photo and 3rd photo are the same angle with the Sun overhead on my left).
Indoors, my 3 lens performed similarly to the outdoors with the I-61 being the sharpest.
Conclusion: I did not experienced the White Spot ever since I stopped using the previous I-26m lens. Perhaps this is a lens defect in the old I-26m. I shot during Noon at 3 angles and it did not experience flare except in the first photo with the new I-26m lens which showed a flare but did not occur again in the subsequent photos. I also need to do more tests for my I-50.
thanks!
raytoei
To recap: I experienced white patch in some of my outdoor photos with a FED-2 and Industar-26m.
see:
http://www.retro.ms11.net/fed2-c.jpg
http://www.retro.ms11.net/fed2-a.jpg
Some suggested weak curtains or light leaks, while other suggested flare of the lens, or even lens defect. When I checked my curtains using a torch light in pitched darkness, I could not find any white spots indicating holes.
Today, I did several tests using different positions and different lens, all in a 30mins period at Noon.
Shot Left, Middle, Right angle all at infinity focus and at the Table at close range. Repeated the tests for Industar-50 collapsible, a different Industar-26m, and a Industar-61 L/D.
I then proceeded to test Indoor shots with the same three lens but at distances 1m, 1.5m, 2m and 2.5m
The noon shots were mainly 1/500s at F/11 or F/16 while the indoor shots were 1/30s and f/2.8 except for the industar-50 which max aperture is f/3.5.
Here are the abridged versions where I cramped 3 photos for each lens in each outdoor and indoor scenario:
http://retro.ms11.net/i-50-outdoors.jpg
http://retro.ms11.net/i-50-indoors.jpg
http://retro.ms11.net/i-26m-outdoors.jpg
http://retro.ms11.net/i-26m-indoors.jpg
http://retro.ms11.net/i-61-outdoors.jpg
http://retro.ms11.net/i-61-indoors.jpg
Observations and Questions:
----------------------------------------
a. My new shiny Industar-50 is a problem kid. I am not sure if it is faulty or I did not extend the collapsible lens fully resulting in poor focus. (Can someone comment on this ?)
b. The Industar-26m seemed to flare in the outdoor photo, the first photo looked overexposed and the Sun was overhead on my left. (Or this could be a light leak due to lens change ?)
c. The Industar-61 L/D performed the best, the first photo was accidentally overexposed, ( I changed lens and forgot to set the aperture). (The first photo and 3rd photo are the same angle with the Sun overhead on my left).
Indoors, my 3 lens performed similarly to the outdoors with the I-61 being the sharpest.
Conclusion: I did not experienced the White Spot ever since I stopped using the previous I-26m lens. Perhaps this is a lens defect in the old I-26m. I shot during Noon at 3 angles and it did not experience flare except in the first photo with the new I-26m lens which showed a flare but did not occur again in the subsequent photos. I also need to do more tests for my I-50.
thanks!
raytoei
julio1fer
Well-known
The Industar-50 collapsible is a very sharp lens. It has to be extended fully out, and then rotated to lock. If not, you'll get unsharp results (don't ask how I know).
Are you using a tripod for these tests, and measuring with tape to set focus?
Are you using a tripod for these tests, and measuring with tape to set focus?
raytoei@gmail.com
Veteran
Julio1er,
Yes to Tripod, Measuring Tape and Shuttle release cable. The tripod mount isn't very good because I add the attachment for the old mounts and it is sort of loose
thanks for the tip on the I-50.
Yes to Tripod, Measuring Tape and Shuttle release cable. The tripod mount isn't very good because I add the attachment for the old mounts and it is sort of loose
thanks for the tip on the I-50.
raytoei@gmail.com
Veteran
julio 1 fer,
Thanks. I tested the I-50 on my FED-3 yesterday and it works perfectly!
raytoei
Thanks. I tested the I-50 on my FED-3 yesterday and it works perfectly!
raytoei
martinsmith99
Established
I have found the same on my I-26. It was used on a bright sunny day. I even have the lens hood attached, but it seems the slightest bit of stray light and it flares. My J-11 & J-8 do not suffer the same problem.
Incidentally, I've just got the Industar 61 for my M42 SLRs. Fantastic lens!
Incidentally, I've just got the Industar 61 for my M42 SLRs. Fantastic lens!
Last edited:
Valkir1987
Well-known
Dear Raytoei,
Check the surface of the I-26 for scratches with another lens or magnifier. I had the same haze/flare with an I-22 that had scratches on the front element.
Check for dust and oil on the aperture blades that can reflect light.
A hood and 'uv or skylight' filter may help as well.
Keep up with your Fed Succes!
Check the surface of the I-26 for scratches with another lens or magnifier. I had the same haze/flare with an I-22 that had scratches on the front element.
Check for dust and oil on the aperture blades that can reflect light.
A hood and 'uv or skylight' filter may help as well.
Keep up with your Fed
Succes!