All Forum Comments
Comment by Tyr posted on Which camera mode with Metz flash at 09/02/2011 - 15:14
Smeggypants wrote:
Harbours are good.
That must be from a K10D Green one one side of the frame and purple on the other. I really hate the long exposure and high ISO banding and gradient problems with the K10D.Harbours are good.
The K-5 should do much better.
I've not given this type of photography a go yet because I have a K10D.
Would really like to go out to the middle of Dartmoor with a telescope and a K-5 and take some photos.
Comment by Tyr posted on How to do Night-time Photography? at 09/02/2011 - 15:11
Algernon wrote:
Exposure Test Constant shutter speed of 1/800th sec.
50mm A f/1.4 Lens 100ISO
Apertures decrease by 1/3 stop between each frame (set in K20D)
Shot RGB Centre Aperture
1 111 f/1.4
2 116 f/1.6
3 111 f/1.8
=========================First Change in Density
4 99 f/2.0
5 82 f/2.2
6 72 f/2.5
7 57 f/2.8
The first sign of the shots getting darker was between f/1.8 and f/2.0
So basically using a constant shutter speed of say 1/800th sec you can use any aperture in manual from f/1.2 to f/1.8 and the shots will all have the same exposure
The lens vignettes below f/2.8. At f/2.8 the exposure is almost constant across the frame.
You get no extra light at the sensor but there should still be an effect on DoF. At least this makes me happier about low light shooting with lenses from f1.7 to f2 which provides the best light collection capability on digital.Smeggypants wrote:
I've just run the following quick test which clearly shows no change from f/1.4 to f/1.8 using an Expodisc pointed at the grey sky. Lens focused on infinity.Algernon wrote:
.... digital sensors can't see f/1.4 they can only see it as f/1.7
This is clearly untrue. Sensors can see the difference between 1.2 and 1.4, never mind 1.4 and 1.7.... digital sensors can't see f/1.4 they can only see it as f/1.7
Exposure Test Constant shutter speed of 1/800th sec.
50mm A f/1.4 Lens 100ISO
Apertures decrease by 1/3 stop between each frame (set in K20D)
Shot RGB Centre Aperture
1 111 f/1.4
2 116 f/1.6
3 111 f/1.8
=========================First Change in Density
4 99 f/2.0
5 82 f/2.2
6 72 f/2.5
7 57 f/2.8
The first sign of the shots getting darker was between f/1.8 and f/2.0
So basically using a constant shutter speed of say 1/800th sec you can use any aperture in manual from f/1.2 to f/1.8 and the shots will all have the same exposure
The lens vignettes below f/2.8. At f/2.8 the exposure is almost constant across the frame.
I know what to go for in low light situations now, my A50 f1.7. Amazing lens sharp from f1.7.
Comment by Tyr posted on Difference between Pentax f/1.4 and f/1.7 at 06/02/2011 - 21:20
Well, I've tried the wireless P-TTL and found it to be really unreliable. I would not use it for an actual shoot as it is so bad. If it is dark then it is ok but as soon as there is a little light it is almost impossible to use.
I'd rather set the flashes to manual and make adjustments in small steps. Hopefully I can test these out soon and report back.
Plus with Metz flashes you can go down to 1/256th power compared to 1/32 or 1/64 with Pentax units.
I'd rather set the flashes to manual and make adjustments in small steps. Hopefully I can test these out soon and report back.
Plus with Metz flashes you can go down to 1/256th power compared to 1/32 or 1/64 with Pentax units.
Comment by Tyr posted on New Cactus V5 flash radio triggers announced at 06/02/2011 - 21:09
Smeggypants wrote:
My Canon shooting buddy took some pics of his zither at 1.2, 1.4, 1.7 an 2.0 - Canon 5D MK1 and 50mm/1.2 lens
Mr Luminous Landscape is talking bollox
My Canon buddy mentioning something about each pixel of the sensor having a small lens which focuses the light on the receptor behind it. Beyond my scope of knowledge but it would seem an arrangemnt would make sense to accommodate light arrive from different angles
A 35mm camera may behave slightly differently, tests on an APS-C would be better.Algernon wrote:
It's been documented on this board previously that digital sensors can't see f/1.4 they can only see it as f/1.7 anyway
Well here's proof that a sensor CAN see the differences between wide apertures.It's been documented on this board previously that digital sensors can't see f/1.4 they can only see it as f/1.7 anyway
My Canon shooting buddy took some pics of his zither at 1.2, 1.4, 1.7 an 2.0 - Canon 5D MK1 and 50mm/1.2 lens
Mr Luminous Landscape is talking bollox
My Canon buddy mentioning something about each pixel of the sensor having a small lens which focuses the light on the receptor behind it. Beyond my scope of knowledge but it would seem an arrangemnt would make sense to accommodate light arrive from different angles
Vignette could explain the difference as light will be bouncing all over the place and not be well focused on the sensor at very wide apertures.
They are called microlenses, they don't work perfectly though.
Comment by Tyr posted on Difference between Pentax f/1.4 and f/1.7 at 04/02/2011 - 10:25
Well, I'm going to give them a go when I can afford it. Would be good to be able to use all three flashes we have reliably with wireless operation.
Comment by Tyr posted on New Cactus V5 flash radio triggers announced at 04/02/2011 - 10:20
Yep, sending stuff by post is very expensive if you are a normal customer. Businesses have big contracts that mean they get reduced rates because of a single collection point and bulk shipping. I know if you find a staples you can send stuff by DHL from there. Citylink only deal with contract customers.
Comment by Tyr posted on Postage - How Much!!! at 24/01/2011 - 17:07
They are out on the 24th, that is Monday next week.
Total price for a set of 4 including shipping, VAT, import duty, etc is... £120!!! I'm going to see if I can order some at some point.
Total price for a set of 4 including shipping, VAT, import duty, etc is... £120!!! I'm going to see if I can order some at some point.
Comment by Tyr posted on New Cactus V5 flash radio triggers announced at 19/01/2011 - 13:35
That is a good price, I could definitely got for 4
At the current exchange rate that is £40 per pair!
At the current exchange rate that is £40 per pair!
Comment by Tyr posted on New Cactus V5 flash radio triggers announced at 14/01/2011 - 13:08
Hopefully by the time I can afford a K5 the stock problems and stain issue would have gone completely.
I've never seen a new camera with 0 shutter actuations.
I've never seen a new camera with 0 shutter actuations.
Comment by Tyr posted on K-5 out of stock? at 13/01/2011 - 15:35
I tend to shoot manual when using flash to get the exact effect I want. Otherwise the camera and P-TTL combination can do things you don't want (too slow a shutter speed, etc.).