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Forum: Pentax DSLR Discussion 4 Days Ago  
Ambiant light meter on Pentax cameras
Posted By GUB
Replies: 55
Views: 1,283
Can't blame ya , I am amazed at the amount of vitriol directed at a simple and valid suggestion in the OP.
Forum: Travel, Events, and Groups 5 Days Ago  
Kiwi Pentaxians
Posted By GUB
Replies: 15,798
Views: 972,680
Such a senseless act
Forum: Pentax DSLR Discussion 5 Days Ago  
Ambiant light meter on Pentax cameras
Posted By GUB
Replies: 55
Views: 1,283
No I said given how cheaply it could be done it is ridiculous not to incorporate one to work in conjunction with the green button and the brilliant digital preview.
It is offensive to describe these great functions as "poor technique " and not full use of the real camera functions
Forum: Pentax DSLR Discussion 03-15-2019, 02:37 AM  
Ambiant light meter on Pentax cameras
Posted By GUB
Replies: 55
Views: 1,283
My words were"core failure of dslr design" and your comment shows that to be an appropriate term.. not only an issue with tripods also if your glasses hold your eye away and also if you pull back your head to find the green button
Forum: Pentax DSLR Discussion 03-10-2019, 01:08 PM  
Ambiant light meter on Pentax cameras
Posted By GUB
Replies: 55
Views: 1,283
But that is precisely what happens now when you are not in LV.
Just tested the K1 now in case they had done something about this core failure of DSLR design.
Stood in a doorway pointing the camera inside in AV and the metering went from 1/30 to 1.2 sec depending on whether my thumb was over the viewfinder.
I doubt whether having an incident meter would be particularly useful in anything but M mode. It would be for those who put a bit of planning into the exposure rather than those who expect the camera to calculate it.
But as I said earlier the physical cost of it would be miniscule and the application of it would be firmware intended to run as an alternative of what the green button currently does.
Forum: Travel, Events, and Groups 03-10-2019, 12:55 PM  
Kiwi Pentaxians
Posted By GUB
Replies: 15,798
Views: 972,680
It finished at that. I wonder how many K1000 I have ? one lying on my desk now abandoned after hooking the lens off it. If only------:confused:
Forum: Travel, Events, and Groups 03-09-2019, 11:48 PM  
Kiwi Pentaxians
Posted By GUB
Replies: 15,798
Views: 972,680
Happy buyer is going to need happy pills when he susses things!
Forum: Travel, Events, and Groups 03-09-2019, 11:03 PM  
Kiwi Pentaxians
Posted By GUB
Replies: 15,798
Views: 972,680
Oh dear -- presumably another one thinking they are getting a 1.2
Forum: Pentax DSLR Discussion 03-09-2019, 12:59 PM  
Ambiant light meter on Pentax cameras
Posted By GUB
Replies: 55
Views: 1,283
Considering my cellphone has one beside the screen so it knows how bright to make the screen that is accurate and presumably close to free it is ridiculous there is not one on my K1.
Combined with digital preview I could home in on the appropriate setting even quicker that what I currently do - that is - take a guess and see!!
The incident meter could work in conjunction with a EV calculator app on the LCD and interact with shutter etc edials.
Given how shonky the in viewfinder metering can be when you take your eye away from the viewfinder to find the green button it would be a great step forward.
It could be an alternative programmable function of the green button.
Forum: Travel, Events, and Groups 03-03-2019, 04:39 PM  
Kiwi Pentaxians
Posted By GUB
Replies: 15,798
Views: 972,680
The Z7 has been a bit of a wake up call that they stick crappolla over the sensor that the mirror system in a dslr takes care of. If you are critical focussing as in closeups or manual lenses then LV beats the OVF hands down.
Forum: Travel, Events, and Groups 03-03-2019, 12:23 AM  
Kiwi Pentaxians
Posted By GUB
Replies: 15,798
Views: 972,680
Nice work.
The K01 has got to be the best bang for buck camera out there. It is really just a K1 with a stomach staple. Pixel for pixel they perform pretty well the same. For the close uppish bokehish work she has displayed the K01 is the equal of the FF.
Thing is you have a noticeable increase in dof with the crop but still have much the same blur/bokeh as FF.
How much blur? - A visual background blur calculator
And a 50mm on crop is budget and as good a portrait lens as you could want.
Forum: Travel, Events, and Groups 03-02-2019, 09:54 PM  
Kiwi Pentaxians
Posted By GUB
Replies: 15,798
Views: 972,680
Finally got to Castle Point. Forgot my tripod so ya do what ya can. Cruel and unusual treatment of an image here. 135mm handheld 1/15 wide open at f2.8. Iso 100 pushed about 10 stops in post holding back the highlights. So about Iso 100,000. The noise will jump out and bite you if you get too close!
Forum: Travel, Events, and Groups 02-27-2019, 07:24 PM  
Kiwi Pentaxians
Posted By GUB
Replies: 15,798
Views: 972,680
Seeing you were at Iso 100, I would love to see what you can pull up by processing only the darkest Raw, using the histogram to pull up the dark areas and holding the highlights back. I am not a fan of HDR and find I can drag a lot of extra dynamic range by being at Iso 100, exposing for the highlights and stretching it out later. Having said that part of the charm of that image is the HDR texture in the rock isn't it.
Forum: Travel, Events, and Groups 02-27-2019, 04:35 PM  
Kiwi Pentaxians
Posted By GUB
Replies: 15,798
Views: 972,680
Was it in camera HDR?
Forum: Travel, Events, and Groups 02-27-2019, 02:56 PM  
Kiwi Pentaxians
Posted By GUB
Replies: 15,798
Views: 972,680
Awesome shot. I wouldn't say it was oversaturated looking at the sand and the rock. But maybe the red has been clipped slightly somewhere in the process giving the red flare a flatness. It would have been very easy to over expose the red. Out of curiosity did you save in raw and what Iso ?
Forum: Pentax Full Frame 02-27-2019, 12:45 PM  
K-1 ISO internals
Posted By GUB
Replies: 27
Views: 1,156
Amp Iso and ApPP Applying gain at the Iso point in the chain and applying gain at the Post processing point. (PP).
The definition of an Iso invariant sensor revolves around the requirement that there is no significant noise introduced between AmpIso and AmpPP.
It is accepted that such a setup exists in the current Sony sensors amongst others.
Forum: Pentax Full Frame 02-27-2019, 03:22 AM  
K-1 ISO internals
Posted By GUB
Replies: 27
Views: 1,156
The thing is that Black end doesn't seem to clip like the light end. The info seems to just compress up against that end waiting to be drawn out.
OK -- you have an Iso invariant sensor
By definition this means no noise is introduced nor information lost between Amp Iso and Amp PP.
If we accept both Amps are equal in efficiency
Then why can it matter which Amp we use.

If you go online and research you will find general acknowledgement of the Iso invariance principle. Even the Canon people don't dispute it's existence despite their cameras being Iso variant. They just dispute its importance. Here - take a look at a site that loves to dis Pentax and look at their Iso invariance section. Just ignore their dribblespeak about the SonyA7ii.
Pentax K-1 Review: Digital Photography Review
Forum: Pentax Full Frame 02-27-2019, 02:23 AM  
K-1 ISO internals
Posted By GUB
Replies: 27
Views: 1,156
I agree fully with that video with the one exception that I thought that the D850 with its non Sony sensor was not Iso invariant.
Forum: Pentax Full Frame 02-25-2019, 10:00 PM  
K-1 ISO internals
Posted By GUB
Replies: 27
Views: 1,156
Yes you are clear but think about it. The amount of image data collected is at the sensor and achieved before the Iso amplification. Therefore the Iso amplified result going to the ADC contains no more info than the base level info. What Photoptemist seems to be implying is that the analogue amplification at Iso time is somehow superior to the digital amplification at pp time. I haven't heard that argument before nor can I see it in results.
Forum: Pentax Full Frame 02-25-2019, 04:54 PM  
K-1 ISO internals
Posted By GUB
Replies: 27
Views: 1,156
Exactly right. It creates good process in that you start concentrating on the optimum aperture and shutter setting for the situation. So basically if you have the aperture as open as appropriately possible and the shutter as slow as appropriately possible and you have checked that your highlights are not clipped then you are at best practise. How simple is that.
Rather than staying at base Iso you can underexpose by say 3 stops via Iso and end up with a visible image to chimp on and easier pping and still keep most of that control of your dynamic range.
Forum: Pentax Full Frame 02-25-2019, 04:37 PM  
K-1 ISO internals
Posted By GUB
Replies: 27
Views: 1,156
My understanding is on a basic level the process goes from the sensor to analogue gain (Iso) then converted to digital signal which is what you PP on. On a non Iso invariant sensor there is noise input from the anloque/digital conversion that PPing amplifies. In an Iso invariant sensor there is negligible noise input from the conversion which means PPing has to all intents and purposes the same output as Iso. In practise you always end up with a difference between the two processes but neither is necessarily a better IQ image. But of course by using the curve tool in the histogram you can have far more control of dynamic range in Iso 100 images.
EDIT check the link that Adam supplied and you will see a good example of a comparison between the two that I did. (post 18)
Forum: Pentax Full Frame 02-24-2019, 08:37 PM  
K-1 ISO internals
Posted By GUB
Replies: 27
Views: 1,156
I have utilised Iso invariance by staying at base Iso for quite a while now and often have to push 4 or 5 stops in PP. I have never seen any sign of banding or for that matter any indication of it in the histogram. I occasionally used to get a little banding when I was using 8bit Gimp as an editor so I know what I am looking for. The main downside of staying at base Iso is it takes fairly precise control of the histogram in the raw developer to get the best out of it. But then the control you have of the highlights makes it all worthwhile.
Forum: Travel, Events, and Groups 02-23-2019, 03:11 AM  
Kiwi Pentaxians
Posted By GUB
Replies: 15,798
Views: 972,680
Quite a few of the reviews question its AF ability. If that is the case then my K 400 5.6 is probably up with the play.
Forum: Travel, Events, and Groups 02-22-2019, 02:46 PM  
Kiwi Pentaxians
Posted By GUB
Replies: 15,798
Views: 972,680
Don't know what these are selling for out in the international market.
SMC PENTAX-FA 400mm f/5.6 IF&ED LENS | Trade Me
Forum: Pentax Camera and Field Accessories 02-20-2019, 01:59 PM  
Testing Batteries?
Posted By GUB
Replies: 19
Views: 892
When I had a hopelessly mixed set of rechargeable AA batteries I tested them by buying a budget single battery analogue clock. I parallel wired a torch lightbulb into the clock circuit as a load. I set the clock to 12 and then saw how far it got. Worked great but I don't know if it would adapt to the higher voltages of the camera batteries.
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