All Forum Comments
Comment by aminstar posted on Moon shots with DA*300 plus Tamron 1.4x TC at 06/04/2009 - 08:48
johnriley wrote:
Tripods are often the culprit. You need a very heavy solid tripod to be sure there is absolutely no movement.
This becomes most critical in very long distance work (as here) and critical macro work.
Thanks John,Tripods are often the culprit. You need a very heavy solid tripod to be sure there is absolutely no movement.
This becomes most critical in very long distance work (as here) and critical macro work.
That really answers my doubts. I had the impression that my tripod was playing up. Even a minute touch was enough to induce a tremour. And now after reading what you just said it all makes sense. Yhe DA*300 lens sits on the tripod rather than the body of the camera itself, so that by itself might add to that tremour. I just thought that once I leave the camera alone and release the shutter with the remote there might be nothing in the camera moving enough to cause this tremour, but it seems that even that minor shutter release mechanism is causing this tremour.
Its extremely evident in the case of the moon, when I started noticing this I began keeping my eye on the view and following it through after the shutter release and I was amazed at the tremour I noticed after the shutter completed the cycle.
I was starting to get worried that it might be something to do with the lens or even with the camera itself.
Thank you very much for your help on this.
I guess I am off shopping for a good tripod. It was on the books for a while now, something that is light but sturdy and reasonably good quality, something good value for money. Any recommendations anyone?
Thanks again
Amin
Comment by aminstar posted on Moon shots with DA*300 plus Tamron 1.4x TC at 06/04/2009 - 00:39
johnriley wrote:
The moon moves quite quickly, so a reasonably high shutter speed is needed, or a motorised mount that keeps track with it.
It doesn't matter if there is a tremor in the camera as long as the tremor occurs after the exposure is over. Using the 2 second delay is good as the mirror rises, everything has time to stabilise and then the only movement is the actual shutter itself, which is virtually nothing.
A very sturdy tripod is needed though and many are just not much good with very long lenses and/or heavier DSLR cameras.
John,The moon moves quite quickly, so a reasonably high shutter speed is needed, or a motorised mount that keeps track with it.
It doesn't matter if there is a tremor in the camera as long as the tremor occurs after the exposure is over. Using the 2 second delay is good as the mirror rises, everything has time to stabilise and then the only movement is the actual shutter itself, which is virtually nothing.
A very sturdy tripod is needed though and many are just not much good with very long lenses and/or heavier DSLR cameras.
so that tremour I notice in the viewfinder after the shutter closes again is almost certain to be the tripod, right? I had that impression because with the 55-300 also although noticeable but its less intense.
Scott, I have been using remote shutter release so automatically the SR goes off
Amin
Comment by aminstar posted on Moon shots with DA*300 plus Tamron 1.4x TC at 06/04/2009 - 00:28
Mike, thanks for your attempt, its clear it was a hopeless case.
Had one with the settings you gave me yesterday Mike, but bumped up the ISO to 200.
Dont know why they lack sharpness.
John, how did the attempts you did in Spain come up? Was lack of sharpness also the main culprit?
Had one with the settings you gave me yesterday Mike, but bumped up the ISO to 200.
Dont know why they lack sharpness.
John, how did the attempts you did in Spain come up? Was lack of sharpness also the main culprit?
Comment by aminstar posted on Moon shots with DA*300 plus Tamron 1.4x TC at 06/04/2009 - 00:26
I have been using a tripod yes, but I have been noticing a problem, something that I detected for sometime. Not sure if its really supposed to be that way so perhaps you could help me out understanding this: I detect a fraction of movement shake when the shutter is released, Particularly noticeable specially when I keep my eye on the viewfinder and then release the shutter, when the viewfinder opens up again I notice that minor tremour. Is this something normal? It happens with both lenses, the 55-300 also although its slightly lesser compared with the DA*300. And I notice it specialy when the subject is furthest away at a distance, and taking shots of the moon is where I notice it more.
I even release the shutter with the 2sec delay timer, but when I keep the eye on the viewfinder I can clearly see the minor twich and shake, something like a vibration. Can someone please explain me what is this? Is this supposed to occur? I am quite confused. The tremour is of an intensity that it would definitely create a blur. I have been thinking that its my tripod playing, as its not exactly a good quality one, a Velbon 600 I think. Its flimsy enough on its legs at full height that a slight touch induces a minor tremour, but would the mirror of the camera flipping be really strong enough to create such a tremour on the tripod?
Or am I missing something here?
Any help would be much appreciated.
Thanks
Amin
I even release the shutter with the 2sec delay timer, but when I keep the eye on the viewfinder I can clearly see the minor twich and shake, something like a vibration. Can someone please explain me what is this? Is this supposed to occur? I am quite confused. The tremour is of an intensity that it would definitely create a blur. I have been thinking that its my tripod playing, as its not exactly a good quality one, a Velbon 600 I think. Its flimsy enough on its legs at full height that a slight touch induces a minor tremour, but would the mirror of the camera flipping be really strong enough to create such a tremour on the tripod?
Or am I missing something here?
Any help would be much appreciated.
Thanks
Amin
Comment by aminstar posted on Moon shots with DA*300 plus Tamron 1.4x TC at 06/04/2009 - 00:13
Mike, RAW file is here, Please try your hand on this one please.
moon
moon
Comment by aminstar posted on Moon shots with DA*300 plus Tamron 1.4x TC at 05/04/2009 - 22:16
Mike,
Once again the hand of experience shows in the modifications you uploaded . I think I am getting there with the TC now.
All I need now is a good shot at the moon .
It helps seeing the images you modified Mike, so I can try to bring mine closer to them. Good ones.
Shim, thanks for the links, I will have a look at them. The purple ghost not too worrying at the moment I think but as Scott noticed once in a while it does crop its head out, when I photograph against the light, which I am forced to in the mornings in my garden. So I will give it a go if it gets bad.
Thanks
Amin
Once again the hand of experience shows in the modifications you uploaded . I think I am getting there with the TC now.
All I need now is a good shot at the moon .
It helps seeing the images you modified Mike, so I can try to bring mine closer to them. Good ones.
Shim, thanks for the links, I will have a look at them. The purple ghost not too worrying at the moment I think but as Scott noticed once in a while it does crop its head out, when I photograph against the light, which I am forced to in the mornings in my garden. So I will give it a go if it gets bad.
Thanks
Amin
Comment by aminstar posted on DA*300 with Tamron 1.4TC (courtesy of Mike-P) at 05/04/2009 - 21:11
scottthehat wrote:
there cracking amin just need to get rid of the ca,
Scott,there cracking amin just need to get rid of the ca,
Had a go and played around with settings after reading about CA. Tried several ways, including tweaking the RAW file in PP. Interesting stuff. Thanks for pointing me to the issue and for the tips. I will be dwelling further now into this and look to improve my pp.
Had a go with this pic, might not be to the great standard but it was the best I could come up with at this initial learning stage.
Comment by aminstar posted on DA*300 with Tamron 1.4TC (courtesy of Mike-P) at 05/04/2009 - 17:24
scottthehat wrote:
there cracking amin just need to get rid of the ca,
Scott, remind me again please, how do I get rid of that nasty CA?there cracking amin just need to get rid of the ca,
Comment by aminstar posted on DA*300 with Tamron 1.4TC (courtesy of Mike-P) at 05/04/2009 - 15:04
Comment by aminstar posted on DA*300 with Tamron 1.4TC (courtesy of Mike-P) at 05/04/2009 - 14:49
There are three things that move during a shot.
1. The mirror flips up.
2. The shutter passes across the sensor plane
3. The mirror flips down.
And if you use your finger to press the button, that's a fourth - you can't avoid moving the camera when you physically press the button, so remote release is a must.
If you use one of the delayed releases (I prefer the 3s one with the K10D), the vibration induced by the mirror banging up will have died down by the time the shutter opens, unless the tripod is too flimsy.
You can't see anything through the viewfinder during the exposure itself, so it's impossible to see what, if any, movement is caused by the vibration of the shutter itself. However, you can be sure that it is negligible compared with 'Mirror slap', as it's called, which is by far the worst culprit.
Then after the exposure, the mirror bangs down again, and vibrates the camera again. This is the vibration you see in the viewfinder immediately after the exposure, but it's irrelevant, since the exposure is all over by the time the mirror bangs down.
I've had a bit of a go at moon photography, though not for a while. Using an SMC-A 400mm F5.6 on the K10D, I found that it was focusing, far more than shake, that was problematic. Even if focus confirmation was evident, only one shot out of four or five would be crisp enough to use.
Clear air is a must, too. The slightest trace of haze ruins moon shots very satisfactorily.
thank you so much for this explanation. This has been very helpful also in understanding the mechanism of the shutter. Now I am much more comfortable knowing that what I see is what you describe as Then after the exposure, the mirror bangs down again, and vibrates the camera again. This is the vibration you see in the viewfinder immediately after the exposure, but it's irrelevant, since the exposure is all over by the time the mirror bangs down..
I was getting very concerned as this vibration (after the exposure though) is massive, well, in focus terms I mean. And although I understood partly that this part of the vibration wasn't affecting the exposure as you well explained but I was assuming that if this post exposure vibration is so intense and prolonged then surely the vibration might have been as long in duration and intensity during the mirror flipping up to not have died off even after the 3sec (K20 on remote) and the shutter passing across the sensor plane. So I am thinking here its the tripod messing up. Also what brought me to this conclusion, of the tripod being the culprit, is the fact that when I use the 55-300 lens (which is lighter than the DA*300) although there is still that vibration I see but its lesser in intensity and time than the lighter lens.
All this of course its just my assumption, I might be very wrong of course, so your views are really helpful in understanding all this, so that I can improve my shots .
I think one way of finding this out is going to SRS and trying my shots on one of the sturdier tripods .
Thanks
Amin