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Indeed found mine Thanks JohnX !
Comment by y_vigourel posted on Issue with ND filters on Pentax 12-24mm with Pentax K3 at 19/12/2016 - 21:19
Hello guys,
A short message to comfirm you, that the interferences where due to some light leaking from the viewfinder! So next step: buy a viewfinder cover.
A short message to comfirm you, that the interferences where due to some light leaking from the viewfinder! So next step: buy a viewfinder cover.
Comment by y_vigourel posted on Issue with ND filters on Pentax 12-24mm with Pentax K3 at 19/12/2016 - 19:15
Hello guys,
First of all thanks for all your answers.
-Indeed I am using 77mm round filters, and when stack together they block the field of view, so I am good to buy a 16 stops ND filter (more difficult to find, any recommendation ?) That's explain the "vignetting".
- Meanwhile regarding the aberration or interference I retain the explanation given by Northgrain... I will do some tests with some tape..I keep you posted!
First of all thanks for all your answers.
-Indeed I am using 77mm round filters, and when stack together they block the field of view, so I am good to buy a 16 stops ND filter (more difficult to find, any recommendation ?) That's explain the "vignetting".
- Meanwhile regarding the aberration or interference I retain the explanation given by Northgrain... I will do some tests with some tape..I keep you posted!
Comment by y_vigourel posted on Issue with ND filters on Pentax 12-24mm with Pentax K3 at 14/12/2016 - 18:11
Yes what I meant by physical vignetting, was indeed that the second filter is intruding the field of view. No solution there but it is a bit too bad...
No problem with the lenshood, but I noticed that it is shaped quite tight, at 12 mm if the lenshood is not properly set in place ( i.e slighty rotated ) it intrudes immediately.
But still what concerns me the most is the strange "Moiré" in the bottom..
No problem with the lenshood, but I noticed that it is shaped quite tight, at 12 mm if the lenshood is not properly set in place ( i.e slighty rotated ) it intrudes immediately.
But still what concerns me the most is the strange "Moiré" in the bottom..
Comment by y_vigourel posted on Issue with ND filters on Pentax 12-24mm with Pentax K3 at 13/12/2016 - 21:01
Dear Pentaxians,
I recently bought a used Pentax 12-24mm f4 lens to start into wideangle photography, so far very good results with this lens mounted on my K3.
As I wanted to start taking long exposure shots during daylight, I bought two ( expensive...) brand new 77mm ND filters, one ND8 and one ND1000 from the Hoya PRO ND series.
In order to reach 30 seconds of exposure during daylight without need to stop down up to f22, I mounted ND8 and ND1000 together on the lens, but then the results are quite surprising at 12mm as you can see in the attached image:
-There is a physical vignetting from the second ND filter ( which remove all the interest from the wideangle lens...)
-Worse there is a kind of chromatic aberration or more likely interference/Moiré that occurs on the lower end of the picture !
Important to note that both ND Filters works fine when used separately.
Do you have any solution or explanation ?
I did a quick seach, but I did not found such issue reported before...so any help will be very appreciated!
Cheers from Toulouse, France
I recently bought a used Pentax 12-24mm f4 lens to start into wideangle photography, so far very good results with this lens mounted on my K3.
As I wanted to start taking long exposure shots during daylight, I bought two ( expensive...) brand new 77mm ND filters, one ND8 and one ND1000 from the Hoya PRO ND series.
In order to reach 30 seconds of exposure during daylight without need to stop down up to f22, I mounted ND8 and ND1000 together on the lens, but then the results are quite surprising at 12mm as you can see in the attached image:
-There is a physical vignetting from the second ND filter ( which remove all the interest from the wideangle lens...)
-Worse there is a kind of chromatic aberration or more likely interference/Moiré that occurs on the lower end of the picture !
Important to note that both ND Filters works fine when used separately.
Do you have any solution or explanation ?
I did a quick seach, but I did not found such issue reported before...so any help will be very appreciated!
Cheers from Toulouse, France
Comment by y_vigourel posted on Issue with ND filters on Pentax 12-24mm with Pentax K3 at 13/12/2016 - 19:51
