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Forum: Non-Pentax Cameras: Canon, Nikon, etc. 06-13-2021, 07:54 PM  
Wildlife in front of the full frame
Posted By Ian Stuart Forsyth
Replies: 99
Views: 17,855
Wren


2 young bucks


And a woody

Forum: Non-Pentax Cameras: Canon, Nikon, etc. 06-12-2021, 08:44 PM  
Wildlife in front of the full frame
Posted By Ian Stuart Forsyth
Replies: 99
Views: 17,855
D800 and the 200-400 F4



Yellow Headed Blackbird Sport with the D800
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 06-06-2021, 11:52 PM  
Wildlife in front of the full frame
Posted By Ian Stuart Forsyth
Replies: 99
Views: 17,855
Another of the Great Grey







Forum: Pentax K-3 III 06-03-2021, 11:08 PM  
Pentax k3 mark 3 - bad copy of the camera at dpreview - ??
Posted By Ian Stuart Forsyth
Replies: 178
Views: 10,323
With the JPEG image they are setting the exposure as to what the camera is metering so that the final image will appear at the correct lightness.
For the raw they are standardizing the exposure for the iso setting so that every camera will capture the same size of exposure for that given iso
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 05-31-2021, 09:29 PM  
Wildlife in front of the full frame
Posted By Ian Stuart Forsyth
Replies: 99
Views: 17,855
Thank you

---------- Post added 05-31-2021 at 09:47 PM ----------

Cliff Swallow taken with the D800 and 70-200 F4


Taken with the D800 and 200-400 F4





Forum: Non-Pentax Cameras: Canon, Nikon, etc. 05-31-2021, 08:50 PM  
Wildlife in front of the full frame
Posted By Ian Stuart Forsyth
Replies: 99
Views: 17,855
Thank you

The new 150-600 both from sigma and Tamron are very good lenses for their price ;)
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 05-30-2021, 09:31 PM  
Wildlife in front of the full frame
Posted By Ian Stuart Forsyth
Replies: 99
Views: 17,855
Another Great Grey with the D4 and Sigma Sport



Forum: Pentax News and Rumors 05-23-2021, 09:27 PM  
DA* 400mm F4 coming!
Posted By Ian Stuart Forsyth
Replies: 234
Views: 54,019
My point was that these so called shallow DOF lenses that someone has no use for can do 2 things give you better subject isolation while still giving that user the ability to capture the same DOF and add to that it allow the user to gather more light for the same framing
Forum: Pentax News and Rumors 05-22-2021, 04:10 PM  
DA* 400mm F4 coming!
Posted By Ian Stuart Forsyth
Replies: 234
Views: 54,019
No DOF is not what makes isolation work, DOF is what DOF is that portion of the image that appears as sharp.

We can have a image with the same DOF and the isolation of the subject is independent of the DOF. This is why a person may want to use a 500mm f4 @ f4.5 and will be able to shoot a subject with the same DOF as a person using a 300mm F6.7 but the subject isolation of the 500 mm lens at that F4.5 will have very different amount of subject isolation so as you can see its not always about DOF as DOF is what it is ( area that appears to be sharp) and isolation is how much of the background is blurred.
Forum: Pentax News and Rumors 05-21-2021, 09:28 PM  
DA* 400mm F4 coming!
Posted By Ian Stuart Forsyth
Replies: 234
Views: 54,019
There is also the ability to use it for subject isolation more so than for shallow DOF, while the DOF is smaller not by much more, I am after the isolation that it offers









I also like how it can be used to draw the attention to they eye of your subject



As someone who also uses 200-400 f4 and 300 f2.8 they are my staple for wildlife and action, I don't find them to be monsters just a tool that can be used
Forum: Pentax News and Rumors 05-16-2021, 09:49 PM  
The challenge of the new Pentaprism
Posted By Ian Stuart Forsyth
Replies: 119
Views: 8,052
But it is a nice lens

---------- Post added 05-16-2021 at 10:02 PM ----------



I for myself like to have the subject isolation that one has with a 300 2.8
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 05-16-2021, 06:55 PM  
Wildlife in front of the full frame
Posted By Ian Stuart Forsyth
Replies: 99
Views: 17,855
Thank you

That is the whole reason why I like photographing wildlife in their habitats
There is nothing like being there to witness them out in the wild and it is even more grandeur than having them allow you to be present
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 05-15-2021, 07:32 PM  
Wildlife in front of the full frame
Posted By Ian Stuart Forsyth
Replies: 99
Views: 17,855
Thank you
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 05-11-2021, 10:28 PM  
Wildlife in front of the full frame
Posted By Ian Stuart Forsyth
Replies: 99
Views: 17,855
Great Grey

Giving the D4 and the 150-600 sport a workout














Over all I am impressed with how well it tracked
Forum: Pentax K-3 III 05-11-2021, 07:41 PM  
K3iii vs D500 vs 7Dii
Posted By Ian Stuart Forsyth
Replies: 53
Views: 3,998
What I have found with the 200-500 is that its best AF is for subjects that are closer to the photographer. with the sigma 100-400 it work really well at med to longer distance very similar to the 150-600 sport.
It would be interesting to see the 150-450 compared to the 150-600 sport. I know with the sport it works extremely well with the D800, D810 and the D4. The hit rate with the lens at very close working distance you may have 1 out of 15-20 shots that are OOF when tracking a moving subject.
Forum: Pentax DSLR Discussion 05-08-2021, 03:32 PM  
K-3 III - Photons to Photos sensor DR measurements
Posted By Ian Stuart Forsyth
Replies: 154
Views: 6,666
For how they tested the cameras the difference between the Nikon and the Tamron lens really would not be noticed. While using the Tamron and the Nikon on the D4 the hit rate for was the same, where I noticed the difference is in the extremes that the Nikon did much better.
When I say extremes this is when trying focus on subject much closer and moving much faster than the subjects shown in the video.
I could have used the my Sigma 150-600 and obtained similar results to the Nikon 70-200 4 for those tests
Forum: Pentax K-3 III 05-06-2021, 11:03 PM  
K-3 III's "Accelerater Unit II" Optional?
Posted By Ian Stuart Forsyth
Replies: 107
Views: 3,298
Show me how the color difference is not a result of the raw converter used in the conversion of those images into a working color space and that it is the accelerator unit resulting in the color differences you see
And as for noise you do realize that an image captured with more light will be less noisy
Next I would ask you to review the images using the same exposure and tell me what differences you see.
Forum: General Photography 04-28-2021, 07:36 PM  
Northern lights
Posted By Ian Stuart Forsyth
Replies: 21
Views: 769
For the last few times I was out shooting the NL how much of the sky was lite up I really wanted to show how much of the NL there was





[IMG][/IMG]

So much of the sky was un fire with the green light I really would have liked to have something in the 8mm for my FF camera
Forum: General Photography 04-27-2021, 10:43 PM  
Northern lights
Posted By Ian Stuart Forsyth
Replies: 21
Views: 769
It really depends on the day and how you are shooting the NL
The last few times I was out photographing the NL I was shooting 10mm and even then this was not wide enough for that day. If they are high in the sky even using the 10mm and in portrait orientation I wound up clipping much of the NL in the FOV
Forum: Pentax K-3 III 04-11-2021, 08:42 PM  
Pentax K-3 III 1.3x Crop
Posted By Ian Stuart Forsyth
Replies: 52
Views: 3,099
The only time that would use an in camera crop mode is to increase either the frame rate or the size of your buffer. If nether of these are needed or the camera does not do this then I see no benefit and if you are using to increase the edge to edge AF point coverage you really have not changed what will fall within the AF coverage area with relation to your subject, However using the crop you run the risk of having the subject fall outside of area recording the image and clipping the subject in some of the frames.
Forum: Video and Pentax HDSLRs 04-02-2021, 11:58 PM  
JordonDucks CroPPY video about Pentax video.
Posted By Ian Stuart Forsyth
Replies: 113
Views: 5,768
Pentax

For the times when you need it

Never be without one

Also check out our selection of
Off With Her Head Guillotines when only the best will do.

( sorry not available in France)
Forum: Pentax News and Rumors 04-01-2021, 08:10 PM  
This is the Pentax K-3 Mark III
Posted By Ian Stuart Forsyth
Replies: 636
Views: 50,859
I have used a camera with face detect while using an OVF and the camera will focus using the nearest AF point to that eye

Ones that I am familiar with pick the eye closet to the camera


It will go for the face closet to the main selected AF point and then will track that face while giving the user feed back in the OVF


Well it was not using face detect first of all
Face detect is only available in Auto AF-C and Auto AF-S. It is not available in DR groups that the D500 was tested using. It is also not available In 3D tracking unless the user targets the eye first and then the camera can track it based on its shape and color just as you can with any other object you can select and have the camera track for you
Forum: Photographic Technique 03-28-2021, 01:11 PM  
Inspiring video. (panoramic techniques)
Posted By Ian Stuart Forsyth
Replies: 8
Views: 681
When doing pano it is also helpful to know the Nodal point of your lens and camera body, while this is not a must it does help when your frame is full of lines. Panning your camera around the nodal point can make it a lot easier when shooting.

Another alternative is to use a shift lens and shift the FOV rather than rotating the camera. This can be useful for lens that are wider 50mm
Forum: General Photography 03-13-2021, 10:16 PM  
I feel an explosion in megapixels coming now
Posted By Ian Stuart Forsyth
Replies: 179
Views: 6,054
One of the problems is that the iso setting listed on the bottom is not base on the exposure size so indeed they can be deceiving in that one would assume they are based on the size of the exposure being equal while most of the time they are not. When we normalize shift the bottom scaling for the exposure size then the data is relatively accurate.

The only reason why I introduced the shadow improvement graph was to show that with many cameras as you increase the iso that in fact can reduce noise and also increase the DR that camera can produce when you are shutter speed limited.

---------- Post added 03-13-2021 at 11:55 PM ----------



Most of the time for the lighting conditions we normally shoot in the red channel is the furthest from clipping if you are shooting raw.

Most of the clipping is done by the combination of the color space and how the raw data is being converted into a workable color space mainly what happens with the white balance, One only has to look at the white balance setting to see as to what is happening

For normal WB in daylight shooting conditions the Red channel is usually under exposed by about 1 stop difference to the green channel, so in fact the green channel is the one that can give us the most problems well before the red channel. What this means is that the green channel usually as no offset while the red channel can be offset at least 2 times to achieve the correct WB

Here is an image that was ETTR


Here is what the raw file looks like



Many times as to what people associate the reds in an image to clip are the furthest from clipping, most of the time where we see clipping starts in the whites followed by the yellows and then the reds
Forum: General Photography 03-13-2021, 02:43 AM  
I feel an explosion in megapixels coming now
Posted By Ian Stuart Forsyth
Replies: 179
Views: 6,054
While I like to use this ap for DOF calc's I like to use it with some cavities.

I always like to decide based on my captured resolution and the details I am looking to display, often times these ap tell us one thing while in reality they maybe influencing us to make incorrect decisions in how to use our equipment.

If we follow the instructions from these ap's they don't tell us what we need to know. For example for a 24mp and if I want to display the finer details in the grass I may need to keep my lens open @ /8 to capture this detail for the amount of MP's of that camera.
In doing this I could be accepting less DOF to capture that grass detail.

Here is where it gets tricky, if i go back to the same scene but this time using a higher resolution camera for the very same amount of captured resolution grass detail but using this higher resolution camera at /16 I don't need to sacrifice DOF for that same captured resolution.



If we look at it @ /14 it tells us we have a blur spot of around 28 but in reality one camera can deliver more resolution stopped down even further than the camera with less MP's
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