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Forum: Lens Clubs 6 Hours Ago  
*Macro* lens club
Posted By normhead
Replies: 4,169
Views: 564,697
Or maybe a less fidgety girlfriend. :D
Forum: Welcomes and Introductions 8 Hours Ago  
Howdy... From Texas...
Posted By normhead
Replies: 12
Views: 308
Welcome to the forum.
Forum: Contest Voting 8 Hours Ago  
Walking in Venice at night
Posted By normhead
Replies: 12
Views: 108
Great work.....
Best use of artistic use of noise I've seen a very long time.
Forum: Post Your Photos! 8 Hours Ago  
Landscape Boring Light
Posted By normhead
Replies: 15
Views: 240
Awe, that's so sweet. :D
Forum: Pentax SLR Lens Discussion 9 Hours Ago  
DA 16-85 WR,show us what it can do.
Posted By normhead
Replies: 1,218
Views: 188,477
Just visiting, don't plan to live here, but who knows? :D
Forum: Post Your Photos! 9 Hours Ago  
Landscape Boring Light
Posted By normhead
Replies: 15
Views: 240
Did you miss me?
Forum: Mini-Challenges, Games, and Photo Stories 23 Hours Ago  
Thematic Forest-walks_Lichen-Fungi-Moss-dead-leaves
Posted By normhead
Replies: 2,090
Views: 127,954
Hey Walter, check it out.

Today's dog walk.
We picked up a used 16-85 from a forum member, because Tess was constantly borrowing my 28-105, and her Tamron 17-50 has become unreliable.

So I took it out today, she had some suspicions about de-centreing, but it tested out fine.
I don't know if I'll ever get to use it again but I was mine today. :D

Tripper runs ahead, and had a rest in the middle of the path.
2021-03-07-Forest-walk-8 by Norm Head, on Flickr

You can always find few dead leaves for test shots.
2021-03-07-Forest-walk-7 by Norm Head, on Flickr

The beech tree forest.
2021-03-07-Forest-walk-6 by Norm Head, on Flickr

2021-03-07-Forest-walk-5 by Norm Head, on Flickr

2021-03-07-Forest-walk-4 by Norm Head, on Flickr

Another leaf.
2021-03-07-Forest-walk-3 by Norm Head, on Flickr

2021-03-07-Forest-walk-2 by Norm Head, on Flickr

Shadow and light
2021-03-07-Forest-walk-1 by Norm Head, on Flickr
Forum: Pentax K-3 23 Hours Ago  
K3 sample shots ... post here !
Posted By normhead
Replies: 11,525
Views: 1,447,142
Today's dog walk.
We picked up a used 16-85 from a forum member, because Tess was constantly borrowing my 28-105, and her Tamron 17-50 has become unreliable.

So I took it out today, she had some suspicions about de-centreing. It tested out fine.
I don't know if I'll ever get to use it again but it was mine today. :D

Tripper runs ahead, and had a rest in the middle of the path.
2021-03-07-Forest-walk-8 by Norm Head, on Flickr

You can always find few dead leaves for test shots.
2021-03-07-Forest-walk-7 by Norm Head, on Flickr

The beech tree forest.
2021-03-07-Forest-walk-6 by Norm Head, on Flickr

2021-03-07-Forest-walk-5 by Norm Head, on Flickr

2021-03-07-Forest-walk-4 by Norm Head, on Flickr

Another leaf.
2021-03-07-Forest-walk-3 by Norm Head, on Flickr

2021-03-07-Forest-walk-2 by Norm Head, on Flickr

Shadow and light
2021-03-07-Forest-walk-1 by Norm Head, on Flickr
Forum: Pentax SLR Lens Discussion 23 Hours Ago  
DA 16-85 WR,show us what it can do.
Posted By normhead
Replies: 1,218
Views: 188,477
ha ha... There's people who st here who I'm sure thought I'd e her with picture well heck freezes over... :D

Today's dog walk.
We picked up a used 16-85 from a forum member, because Tess was constantly borrowing my 28-105, and her Tamron 17-50 has become unreliable.

So I took it out today, she had some suspicions about de-centreing. It tested out fine.
I don't know if I'll ever get to use it again but I was mine today. :D

Tripper runs ahead, and had a rest in the middle of the path.
2021-03-07-Forest-walk-8 by Norm Head, on Flickr

You can always find few dead leaves for test shots.
2021-03-07-Forest-walk-7 by Norm Head, on Flickr

The beech tree forest.
2021-03-07-Forest-walk-6 by Norm Head, on Flickr

2021-03-07-Forest-walk-5 by Norm Head, on Flickr

2021-03-07-Forest-walk-4 by Norm Head, on Flickr

Another leaf.
2021-03-07-Forest-walk-3 by Norm Head, on Flickr

2021-03-07-Forest-walk-2 by Norm Head, on Flickr

Shadow and light
2021-03-07-Forest-walk-1 by Norm Head, on Flickr
Forum: Pentax K-1 1 Day Ago  
Post your K-1 pictures!
Posted By normhead
Replies: 31,452
Views: 2,901,684
Nice starburst.

It's always nice to see something a little different.
Forum: Post Your Photos! 1 Day Ago  
Landscape Boring Light
Posted By normhead
Replies: 15
Views: 240
I concur....
Not enough fog to be "atmospheric".
Not enough colours besides blue to have any colour contrast

No doubt enough light to count coos however.
Forum: General Photography 1 Day Ago  
I feel an explosion in megapixels coming now
Posted By normhead
Replies: 138
Views: 3,624
Photographic Dynamic Range versus ISO Setting

Nice site. Look at the company the K-1ii holds in the ranking list below. It punches way above it's weight.

The suggestion is that the K-1ii maintains a rating of 11.43 in low light. The best phase 1 is rated 13.11.

The only question unanswered is can anyone really tell the difference. When you consider the human eye can take in about 20 (7 EV but your eye adjusts very quickly and stitch an image together in your brain.) Does this mean anything at all to the people viewing the images? Practically.

When I've tried to test my K-1 against my K-3 even though technically my K-1 is 11.43 DR and my K-3 is rated (at least on this site) as 10.28, I have been unable to produce those magic images to demonstrate that one image is better than the other in real life shooting situations. (Or as I've heard Canon shooters say "Dynamic Range? We don't need no stinking dynamic range.)

Just wondering if anyone has been successful at showing the value of the extended DR above say 10 EV. Based on the chart posted, I would never consider buying any of the camera rated above my K-1 for dynamic range, because almost all the importance of dynamic range to date has been largely hypothetical without back up empiracle evidence. We know The Phase 1 is marginally better on a graph, But not one knows what it means in the real world. We only have projections, not images. The problem for me being very few images require a lot of dynamic range. And that tells me dynamic range is applicable in very few images, once you're over 10 EV.

My Panasonic ZS100 rated at 9.80 in the other hand shows clear clipping shadows and highlights in the same image on every day images.

The thing that stands out looking through the list, for maximum PDR is the absolute dominance of 645 sensors over FF sensors for DR, and the absolute value of Pentax gear, in giving you the best DR to cost/performance ratio of anything out there.

I look down their list and it doesn't make sense given my own experience with the cameras that I own that are listed. This compounded by the fact that I have often blacked out viable sections of sunsets etc, not because they lacked shadow detail, but because the image just looked better overall with some areas left dark. The whole black /white balance thing.

Even when I have great DR, I sometimes choose not to use it.

The Canon R5 is just ahead of the Pentax 645Z in dynamic range. I think we can assume everyone is doing what they can to expand dynamic range at the moment, but as far as I can tell only the Canon EOS R5 and Sony 7R have managed to make it up into 645 range, but the bottom end of 645 range, barely better than the 5 plus year old 645z.

The chart shows all of the top 5 in DR 12 EV or over as Medium Format high res cameras. But the bottom of those top 5, at 12 EV is only marginally better than that whole slew cameras 11.60 0r better. So what photographically does that mean?

To me it suggests that high res medium format is better but costly. DR is costly. $4k to the sky...unless you guy a K-1ii, or D610 with limited resolution. The evaluation of what the added DR means to you is worth more to you than the charts. So, I'd like to see someone with an ultra high DR image tell us what they think they gain.

The one thing I do notice, you get fewer portraits and almost no action shots, no birding shots, few macros, few wildlife images with a Phase 1, and many shots where there's lot of time to set up and shoot. And for many on the forum and many photographers in general, that's a big deal. These are cameras that do things other cameras don't, but they also are apparently cameras that aren't good for what a lot of photographers do most of the time. They seem unlikely they will be good for doing the things a lot of FF shooters use their gear for.

So really, how bad do you want that 1.5 extra stops of DR?

From my reading of the list, the current front runner for the average Pentax user who wants high res would be the Fuji 100 MP camera. Though I have no idea what the lens environment would be for that camera. ( It appears be 250mm which on large format is pathetic.) And hopefully Pentax will move ahead with their new 645 incarnation. If Pentax can match resolution, price and DR the legacy lens environment will give Pentax the edge, but that's lot of ifs. The Fuji looks like it could be the best action 645, if it has the lenses to support that kind of work, and if they don't cost as much as my house. :D

Just another thread that ends up with Fuji being the best choice for people unhappy with the rate of Pentax advancement.

Thanks guys, interesting stuff.
Forum: General Photography 1 Day Ago  
Is it bad to store lenses and equipment in a pelican case long term?
Posted By normhead
Replies: 13
Views: 629
The pelican cases for cameras come with square punch outs so you can custom build the interior to suit your lens collection. There is no need for extra padded dividers. All at least until you change what lenses are stored in the case. There's little left of my original interior because there have been so many different combination of lenses and cameras in it.

camera-cases by Norm Head, on Flickr

However I don't use these for long term storage..... I keep all my lenses in this cabinet, where they are available for use. I do know clients who do store their equipment in rather massive Pelican cases however. How ever, they also use those cases when they travel. So they are travel cases as well as storage cases.
Photography-corner by Norm Head, on Flickr

The main disadvantage of Pelican type cases would be the expense, well at least compared to Tupperware.

After all, a pelican case could be considered a really well made practically indestructible piece of Tupperware with customizable padding and handles.

So bottom line Pelican cases are an option for long term storage with proper care and expense, but they are designed for the traveller. Air flow around the lenses is restricted, although how critical that is depends on how long you go without opening the case. If there is any rubber in your lenses , water seals or whatever, restricting the presence of oxygen is a good idea.

https://www.bhphotovideo.com/explora/photography/tips-and-solutions/8-ideas-...ur-camera-gear

So given that the OP's choice was Tupperware or Pelican case, the best answer is Pelican Case. Whether it's worth the extra money, which will be considerable is a personal decision.
The great thing about articles like this, everything is covered. Negative feedback is directed at others. Nothing like trying to help some one out and getting dumped on for it.

As well, if there are rubber elements in your lenses as expressed above
[quote]Natural rubber, especially if not blended or filled with carbon black, is particularly prone to oxidative deterioration due to reaction with oxygen in the air. Oxidation, however, can be retarded by storing the object in an oxygen-free environment (Shashoua and Thomsen, 1993; see below under 'Oxygen').[/QUOTE

https://www.canada.ca/en/conservation-institute/services/conservation-preser...r-plastic.html

Also I looks like modern plastics need much less care than older ones.


But it occurs to me that the use of plastics bring a whole new dimension to the storage game than all metal and glass storage did. If the exact deterioration characteristics of the materials used in the lenses are not known,

But some general guidelines.


So essentially, it's probable you aren't going to go for museum quality storage. It's a question of what will do. Pick the one that suits you from the B&H solution above and anyone of them is being used by photographer somewhere. You pretty much can't go wrong. But no matter what you do, absolute perfection is not going to happen. It's all about what you can live with. Things decay and corrode, nothing you can do about it. There's little in this world oxygen won't break down over time. So part one for long term storage would be restricted airflow. I'm pretty sure that doesn't involve "well ventilated." But if someone else has a link saying different, I'd be happy to give it a read.

Given the information above, Metal cases without coatings might be the best choice as all plastics give off gasses when they degenerate that could damage the lenses. But for most of us, the performance of our older lenses would suggest not much special care is needed for photographic equipment, as some of us have 40 year old lenses that are still functioning as designed. Some of it just stored in old camera bags. If there really isn't much of a problem, it's hard to find a solution.
Forum: General Photography 1 Day Ago  
Does one need fisheyes to fully appreciate the Point of View?
Posted By normhead
Replies: 10
Views: 586
Great images, of scenes most of us have never experienced.
Forum: General Photography 1 Day Ago  
Is it bad to store lenses and equipment in a pelican case long term?
Posted By normhead
Replies: 13
Views: 629
Are you expecting us to take your word for this?

I have 30 year old lenses that have never been stored in anything but a glass fronted display case. SO I could make the argument that any storage case is un-necessary. But the OP wants a case.



That depends entirely on where you live. There have been many posts from people who live in humid environments who had problems. But tell me how you came up with this idea... I'm curious. We do have a few forum members who have controlled temperature and humidity cases. They might disagree with your opinion.

---------- Post added 03-06-21 at 10:07 PM ----------



I'm really curious as to whether the OP is asking about never opening his cases for 10 years that seems extreme.
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 1 Day Ago  
Canon R1 leaked. Unreal specs
Posted By normhead
Replies: 11
Views: 477
They already have one that's tested about the same as the K-1 (but slightly higher.). They aren't the old Canon any more.
Forum: Welcomes and Introductions 1 Day Ago  
Hi, still debating I what I should buy
Posted By normhead
Replies: 34
Views: 855
We actually own a Sigma 18-250 which was great lens, until it became decentred and was sent to Sigma to no avail. But it did do very well in one of the IQ polls I ran where I put up images from 6 or 7 lenses and ask forum members to judge their quality. I believe if memory serves me well it actually won in one category against much more expensive lenses, prime and zooms. We tend to be pretty hard on our gear, but non-the less, I expect more ruggedness for my gear. Lenses like my DA*60-250 have taken everything I could hand out and are still working great. We also have a Tamron 17-50 which has become decentred, replaced recently by the DA 16-85. So we have two lenses, a Sigma and a Tamron that we will no longer use. They can both produce good images but they aren't reliable.

Both Tess and I have used the 18-250 with acceptable results. But we carry our lenses in Pelican cases over hill and dale. Someone a little less demanding of their lenses could have better results and more longevity.
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 1 Day Ago  
Fuji GFX100s - 100MP Cropped Medium Format for under $6,000??
Posted By normhead
Replies: 168
Views: 6,739
Thanks for the answer.
Keep us informed, this is interesting stuff.
Forum: General Photography 1 Day Ago  
I feel an explosion in megapixels coming now
Posted By normhead
Replies: 138
Views: 3,624
OK, reading the article posted above....
8, 12, 14 vs 16-Bit Depth: What Do You Really Need?!



Pretty much what I said.
Anyone else have some practical stuff, that doesn't agree with my posts, this one was right up my alley.
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 2 Days Ago  
Fuji GFX100s - 100MP Cropped Medium Format for under $6,000??
Posted By normhead
Replies: 168
Views: 6,739
I'm not sure if you process for high contrast or there's a distinct lack of dynamic range?

Any comment?

Apart from that it looks like a great an functional camera that's solved many of the problems that kept me from buy-in a 645z. Size, clunkiness, no IBIS, etc.

But $2000 is as stretch for my budget. $6000 US is completely beyond reach.

I'm going off to lick to see if they have some images.

https://www.flickr.com/search/?text=Fujifilm%20GFX%20100

Is it just me, or does everyone of these images appear to be oversaturated and too high contrast? That's going to be personal preference of course. I'd have to have the camera for a while to see if I can actually produce output more to my liking. It appears to encourage the Velvet Elvis school of photography. :D

Images that appear like that usually lack the tonal distinctions needed to produce life like high DR images. As expected, the 100 MP means next to nothing, I'd make the decision to buy based on it's rendering, maybe just all these shooters don't like what I like, and I could do it different, but right no my opinion is .
Forum: General Photography 2 Days Ago  
Is it bad to store lenses and equipment in a pelican case long term?
Posted By normhead
Replies: 13
Views: 629
As opposed to hard rubber and flakey plastic you get when you store in a ventilated area? You're kind of picking your poison there.

Storing items for 10-20 years.... now were into some kind of serious expense. But that would never happen with most camera gear, because we take them out to use them from time to time. If we're talking long term archival storage, now we're getting into a very expensive category, not really appropriate to camera gear for most of us. You'd need a controlled moisture environment and possibly a gaseous environment and knowledge of the optimum humidity requirement for each component. And the rubber would likely be different from the plastic. That's a minefield that requires serious expertise. I thought we were talking off the shelf solutions.

You do realize our OP is talking bout storing his lenses in Tupperware dont' you? Nothing suggests he's willing to go for a controlled environment solution.

I'm sure there's somewhere that makes controlled cases with temperature and humidity controls and the knowledge to tell you how to set the parameters for you camera gear. That's a big step up from Tupperware. :D
Forum: Post Your Photos! 2 Days Ago  
Architecture Madawask, pioneer Anglican Church
Posted By normhead
Replies: 15
Views: 527
Wow, the things you find out when you ask a few questions.
Thanks

In my mind you can never ind out too much local history.
Forum: General Photography 2 Days Ago  
I feel an explosion in megapixels coming now
Posted By normhead
Replies: 138
Views: 3,624
Exactly, it has little to do with the number of bits recorded. It's an output feature.
Where as a sensor with more sensitive pixel sites and deeper wells that would have more DR in it's input, could be translated to 8,12,14 or possibly even 16 bit depending on application demands.
Forum: General Photography 2 Days Ago  
I feel an explosion in megapixels coming now
Posted By normhead
Replies: 138
Views: 3,624
So what empirical evidence is there that these differences are significant to the human eye?

if there are areas significance, what are the parameters that would define them?

The obvious criticism of this type of graph is that 8 bit images can be quite acceptable. Dynamic range is more determined by the DR capability of the sensor than the number of bits in capture. My ZS100 will never have the DR of my K-1 and K-3 no matter how many bits the output is.

Looking at the top graph, the obvious (to me) question is how does a K-1 achieve a measured 14.9 stop DR on a 14 bit sensor? The hypothesis is disproved by actual scientific measurements.

It all depends on this.


That's a pretty bold hypothesis. It will definitely need an empirical evidence before I buy in to it.

Not everything that can be graphed is graphing useful significant data.

14 bit (36 MP)
2020-03-17-male-ruffed-grouse-6 by Norm Head, on Flickr

12 bit (12 MP)
Bird-1-Ruffed-Grouse by Norm Head, on Flickr

I'm going to venture that there is so little difference between 12 bit and 14 bit it makes absolutely no difference to anything.
And the corollary to that will be , going from 14 bit-16 bit will provide even less benefit I any.

The difference in these use shots is more about 12 MP vs 36 MP. Any DR differences are minor.

But I'm open to any real world world proof of concept photos anyone cares to share.

The assumption that camera makers didn't decide 12 bit was suficient, but went to 14 bit as a bit of redundant capacity, making 16 bit just more redundant capacity, is unwarranted.

The notion that 16 bit would provide DR the sensor doesn't support, is just silly.

And the benefits of 16 bit images are unsupported by empirical data.

The "more is always better" folks seem to think their reference for more of whatever somehow translates into better. Even too much water and there things critical to life can kill you. More is not always better. That needs to be established with sm kind o data. Speculative graphs based on unknown data samples (assuming there were any data) and this graph isn't just a hypothesis) don't count as data. Real world applications count as data. You can't make an image with a graph. We need t be able to evaluate the rigour of the graph maker.

Bottom line, once optimal is achieved, "improvements" after that are by definition less than optimal. I see little evidence that 12-14 bit isn't optimal. But hey convince me with images. I'll be happy to change my mind.

What I'm saying is it looks like a bunch of pseudo scientific gobbledygook to me.

What seriously needs to be addressed by the "more is always better crowd, is the hypothesis that competing systems, AD conversion, bit depth , human perception etc will lead to an optimal convergence, and that going above or below those setting produces a decrease in performanence... when you something like proposing 16 bit , bit depth, you really have to demonstrate in the real world, that's even useful, forget about optimal. Addin another 5 horse power to a 395 horse power engine does practically nothin g int erms of power prod but 400 sound a lot better that 395 to a possible purchaser. Not all "bigger is better" is about performance.

My guess is those currently selling 16 bit cameras are using it as marketing hook to justify overpriced product.
Forum: Welcomes and Introductions 2 Days Ago  
Complete newbie
Posted By normhead
Replies: 12
Views: 259
Welcome to the forum.
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