All Forum Comments
I doubt if it is a problem with the lens or body. It is probably the way the light is being refracted by the subject, water droplets sand etc that is causing this effect.
Comment by kiwao posted on Are these circular highlights ok? at 19/05/2014 - 13:12
Smeggypants wrote:
No the camera focusses at the widest aperture of the lens ( except old non A-button lenses ) . When you press the shutter button the lens stops down and the mirror flips up. Only then the shutter opens to take the picture.kiwao wrote:
If the aperture is set at f2.8, wide open, and the camera focuses using that aperture then the blades would not operate and therefore should be wide open when the shutter operates. I am not sure at what aperture the camera focuses at but I think the aperture closes to f5.6 focuses then adjusts to the set aperture which in this case was f2.8 and if this is the case could it be that the shutter operating before the blades have finished?opening.Smeggypants wrote:
[quote:3496ace15f="JohnX"]I personally think that given you were shooting at 2000th that what you see is as good as it gets. It's a huge ask for a lens to stop down that quickly and settle into a perfect circle; just think of the inertia!
I'd try again at slower speeds and see what results you get then.
By the way, I really like your cherry blossom shots.
Given the shutter doesn't operate until the lens has stopped down the shutter speed is ( or should be ) irrelevant. i.e the shutter speed is how long the shutter is open for NOT how long it takes to open after the button is pressed. [quote:3496ace15f="JohnX"]I personally think that given you were shooting at 2000th that what you see is as good as it gets. It's a huge ask for a lens to stop down that quickly and settle into a perfect circle; just think of the inertia!
I'd try again at slower speeds and see what results you get then.
By the way, I really like your cherry blossom shots.
Quote:
The thing is am I expecting too much to see circular highlights considering the subject but if they should be circular in shape then what is causing this irregularity to happen?kiwao wrote:
But shouldn't the shutter only open when the aperture has finished adjusting.?
yes that's what happens JohnX wrote:
I personally think that given you were shooting at 2000th that what you see is as good as it gets. It's a huge ask for a lens to stop down that quickly and settle into a perfect circle; just think of the inertia!
I'd try again at slower speeds and see what results you get then.
By the way, I really like your cherry blossom shots.
Thanks for your kind comment about the cherry blossom pics,I personally think that given you were shooting at 2000th that what you see is as good as it gets. It's a huge ask for a lens to stop down that quickly and settle into a perfect circle; just think of the inertia!
I'd try again at slower speeds and see what results you get then.
By the way, I really like your cherry blossom shots.
But shouldn't the shutter only open when the aperture has finished adjusting.?
Comment by kiwao posted on Are these circular highlights ok? at 19/05/2014 - 03:38
JohnX wrote:
I personally think that given you were shooting at 2000th that what you see is as good as it gets. It's a huge ask for a lens to stop down that quickly and settle into a perfect circle; just think of the inertia!
I'd try again at slower speeds and see what results you get then.
By the way, I really like your cherry blossom shots.
Thanks for your kind comment about the cherry blossom pics,I personally think that given you were shooting at 2000th that what you see is as good as it gets. It's a huge ask for a lens to stop down that quickly and settle into a perfect circle; just think of the inertia!
I'd try again at slower speeds and see what results you get then.
By the way, I really like your cherry blossom shots.
But shouldn't the shutter only open when the aperture has finished adjusting.?
Comment by kiwao posted on Are these circular highlights ok? at 19/05/2014 - 01:37
Smeggypants wrote:
If the aperture is set at f2.8, wide open, and the camera focuses using that aperture then the blades would not operate and therefore should be wide open when the shutter operates. I am not sure at what aperture the camera focuses at but I think the aperture closes to f5.6 focuses then adjusts to the set aperture which in this case was f2.8 and if this is the case could it be that the shutter operating before the blades have finished?opening.JohnX wrote:
I personally think that given you were shooting at 2000th that what you see is as good as it gets. It's a huge ask for a lens to stop down that quickly and settle into a perfect circle; just think of the inertia!
I'd try again at slower speeds and see what results you get then.
By the way, I really like your cherry blossom shots.
Given the shutter doesn't operate until the lens has stopped down the shutter speed is ( or should be ) irrelevant. i.e the shutter speed is how long the shutter is open for NOT how long it takes to open after the button is pressed. I personally think that given you were shooting at 2000th that what you see is as good as it gets. It's a huge ask for a lens to stop down that quickly and settle into a perfect circle; just think of the inertia!
I'd try again at slower speeds and see what results you get then.
By the way, I really like your cherry blossom shots.
Comment by kiwao posted on Are these circular highlights ok? at 19/05/2014 - 01:33
Glowingblue wrote:
Having difficulty making the links!
click on the lower imgp in both cases and you will get to the linkHaving difficulty making the links!
Comment by kiwao posted on Are these circular highlights ok? at 18/05/2014 - 15:03
This image was taken with the da*200 at f2.8, 2000th shutter speed. I thought that highlights were shaped by the aperture and therefore as the lens is wide open these highlights should be circular. Am I correct?
Other images taken on the same day have similar shaped highlights but only at high shutter speeds above 2000.
IMGP7853 by kiwao, on Flickr" class="comment_image" />
IMGP7853-2 by kiwao, on Flickr" class="comment_image" />
Other images taken on the same day have similar shaped highlights but only at high shutter speeds above 2000.
IMGP7853 by kiwao, on Flickr" class="comment_image" />
IMGP7853-2 by kiwao, on Flickr" class="comment_image" />
Comment by kiwao posted on Are these circular highlights ok? at 18/05/2014 - 13:21
Smeggypants wrote:
breath and a bit of bog roll, but it's a erate occourance . No filters on my lenses either
How does the breath work? Does it make the bog roll softer and therefore basics bog roll can be used as opposed to super soft triple ply Andrex bog roll?breath and a bit of bog roll, but it's a erate occourance . No filters on my lenses either
Comment by kiwao posted on Cleaning lenses/filters at 03/05/2014 - 08:37
I have never read that some lenses did not work well with filters. I have heard that some filters are easier to clean than others. In the video link I posted earlier I think he is a bit heavy handed but maybe that is because I am too careful. This video link has good info about cleaning lenses but some people on line would disagree with the use of rubbing alcohol as suggested in the video.
I myself have fujifilm lens cleaner but when it dries it leaves a residue on the surface of the filter/lens and it is a real pain to remove. What do other people use?
I myself have fujifilm lens cleaner but when it dries it leaves a residue on the surface of the filter/lens and it is a real pain to remove. What do other people use?
Comment by kiwao posted on Cleaning lenses/filters at 03/05/2014 - 05:29
I just thought it was ironic that I should fit the filter so that I would not have to clean the front element and then after about a year when I take off the filter I find that the front element has become filthy despite this. I do not know how. Trapped dirty air or condensation but it means that for I do not know how many months I have been taking pics unaware that the lens had a dirty front element and not questioned the image quality.
Comment by kiwao posted on Cleaning lenses/filters at 02/05/2014 - 13:48
Last weekend I decided to give my lens filter a good clean. I gave it a blow with my bulb blower and then after a little breath I gave it a gentle wipe with a micro fibre cloth. Looked spotless but just to make sure I shone my bright penlight across the surface just so and low and behold there was a small smudge near the centre and a few dust specs. I tried again with breath and microfibre still no joy.
Now when I first bought this lens after giving the front element a blow I fitted this brand spanking new fresh out of the box pristine condition filter to the lens thinking now the front element is protected; will always be virgin clean and I only ever need to clean one face of the filter.
This smudge that I could not remove with a gentle wipe of microfibre was bugging me. Must be on the inside surface. Oh no! I am going to have to remove the filter and risk evil light refracting dust particles attaching themselves to the front element ready to reek havoc with the lens coatings. Holding the lens down I unscrewed the filter and quickly attached the lens cap. Cleaned of course. I then gave the internal surface of the filter a little blow, applied a little breath and a wipe. No joy the smudge was still visible. Time for the lens cleaning fluid and lens tissues. One drop on the tissue a wipe removed the smudge. Success at last I thought but wait what’s this I see on the surface of the filter? Residue from the cleaning fluid. Try again with fluid still a residue is visible so just as I decide to try remove the residue with a lens pen the filter slips from my fingers landing edge first on the floor. Broken. After all this cleaning I have to buy a new filter. Aaagh!
One more thing. My idea that by fitting a new filter to a new lens and not removing it would mean that the front element of the lens would be kept perfectly clean was wrong. When I inspected the front element of the lens that had been protected with this filter from new for nearly a year, I discovered not only dust but all kinds of gunk on the surface.
How do you clean your filters/lenses.
Hears a link to a video for your amusement?
link
Now when I first bought this lens after giving the front element a blow I fitted this brand spanking new fresh out of the box pristine condition filter to the lens thinking now the front element is protected; will always be virgin clean and I only ever need to clean one face of the filter.
This smudge that I could not remove with a gentle wipe of microfibre was bugging me. Must be on the inside surface. Oh no! I am going to have to remove the filter and risk evil light refracting dust particles attaching themselves to the front element ready to reek havoc with the lens coatings. Holding the lens down I unscrewed the filter and quickly attached the lens cap. Cleaned of course. I then gave the internal surface of the filter a little blow, applied a little breath and a wipe. No joy the smudge was still visible. Time for the lens cleaning fluid and lens tissues. One drop on the tissue a wipe removed the smudge. Success at last I thought but wait what’s this I see on the surface of the filter? Residue from the cleaning fluid. Try again with fluid still a residue is visible so just as I decide to try remove the residue with a lens pen the filter slips from my fingers landing edge first on the floor. Broken. After all this cleaning I have to buy a new filter. Aaagh!
One more thing. My idea that by fitting a new filter to a new lens and not removing it would mean that the front element of the lens would be kept perfectly clean was wrong. When I inspected the front element of the lens that had been protected with this filter from new for nearly a year, I discovered not only dust but all kinds of gunk on the surface.
How do you clean your filters/lenses.
Hears a link to a video for your amusement?
link
Comment by kiwao posted on Cleaning lenses/filters at 02/05/2014 - 06:46
