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Forum: Pentax SLR Lens Discussion 2 Days Ago  
Is this the rarest K-Mount lens? (Sigma 800mm f5.6)
Posted By bdery
Replies: 13
Views: 2,097
Certainly rare, and with AF no less!

Rarest is a bold statement. I've once owned a lens that I didn't know existed, and had rarely seen listed anywhere, the Vivitar 120-600mm. The Pentax 35mm F1.4 is also a good example. Some other lenses come to mind. "Among the rarest" is a safer phrasing :)
Forum: General Photography 3 Days Ago  
Selling regrets
Posted By bdery
Replies: 18
Views: 1,354
If he tested it for half an hour, you're golden. I wouldn't have accepted that long a test.

I'm sure he simply turned on Clarity, or he's using an older, slow memory card. Or he can't live with a 12 years old camera with less than 10k accuations.

I'd say these things to him, politely, then leave it be.
Forum: Pentax SLR Lens Discussion 06-22-2022, 06:40 AM  
Replace DA 16-85 or get another lens
Posted By bdery
Replies: 15
Views: 884
Do you use the K-1 more than APS-C cameras? this should drive your decision I think. The 16-85 and 28-105 are essentially similar lens for different formats.
Forum: Pentax Camera and Field Accessories 06-22-2022, 06:39 AM  
Recommend Backpack for 150-450 + K3 III/KP + Tripod
Posted By bdery
Replies: 12
Views: 588
I tended to agree with this. However in the last years camera bags have improved so much that I don't agree anymore. There are now many excellent backpacks.

A great suggestion.

Anything by Mindshift Gear, Shimoda, Atlas, F-stop is excellent for hiking. The long lens will be a bit more challenging but there are solutions. Even a Peak Design Everyday Backpack with optional hip strap and well-positioned dividers would work.

There are many in-depth reviews of backpacks on Pentaxforums, this can give you a good start.
Forum: Repairs and Warranty Service 06-22-2022, 05:36 AM  
Should I fix my 40?
Posted By bdery
Replies: 55
Views: 1,584
I have a lot of respect for that lens. I just don't love its focal length. To me 43 is the most natural and comfortable focal length ever.
Forum: Welcomes and Introductions 06-21-2022, 05:39 AM  
I've inherited a massive camera collection from my father
Posted By bdery
Replies: 23
Views: 851
You you plan to

1-keep the collection as is?

2-use it?

3-sell it or some of it?

On a usability standpoint, I'm guessing that a collector took good care so apart from stuff wearing out (the foam around light boxes in some cameras, for instance), it should be in working order. That being said, keep in mind that in this day of automated cameras and mobile phones, using older gear will take some dedication. Manual focusing, manual exposure, etc. It's not a problem, but the learning curve will be a bit steeper.

Also, it's probable that many of the items in the collection will have low to average monetary value. There is bound to be some fantastic items there, but some will have more sentimental value than monetary value. Even if they are optically very good. So if your plan is to sell some of it, you'll have highs and lows.

In any case, sorry for your loss, the enthusiasm with which you write makes me think you had a great relationship with your dad. That's the best treasure.
Forum: Repairs and Warranty Service 06-20-2022, 04:59 AM  
Should I fix my 40?
Posted By bdery
Replies: 55
Views: 1,584
They should be ashamed of themselves, truly.

B) maybe, but maybe not at a price covering the cost of repairs.

As I mentioned above regarding sunk cost, the OP needs to consider the cost of repair vs the cost of a replacement (which could be zero if the lens isn't needed) or the resale value. Past value of the lens is moot.
Forum: Pentax Camera and Field Accessories 06-20-2022, 04:56 AM  
Cosyspeed Photohiker 24/48 - Kickstarter
Posted By bdery
Replies: 17
Views: 1,345
Yep, I use Peak Design's Capture Clip myself.

Even with my wife and kids, patience is short...
Forum: Digital Processing, Software, and Printing 06-17-2022, 07:09 AM  
THIS is why I don't trust AI image processing software...
Posted By bdery
Replies: 50
Views: 2,128
That's a good way to put it.

Agreed again.

I think part of the problem is a dialogue of deaf between people who think photography should represent , document the world, and those who feel that photography is art and everything is fair game.

I see dangers in blindly following the second, but I see unnecessary limitations in doing only the first.

I tend to dislike anything close to a deepfake, and in this POV I don't really like replacement.

Not being informed enough accounts to being wrong.

Having an agenda brings inaccurate and misleading opinions and "facts".
Forum: Pentax SLR Lens Discussion 06-17-2022, 06:03 AM  
What happened to Bellows?
Posted By bdery
Replies: 29
Views: 1,357
Coatings would play a larger role, beyond a certain basic level of quality for the glass.

I think the relative abundance of 2x macro lenses also gives another, simpler solution to people who would otherwise have looked at bellows.
Forum: Photographic Equipment for Sale 06-13-2022, 05:28 AM  
For Sale: REDUCED Michael Kors Fossil Gen6 Bradshaw watch and many accessories, new
Posted By bdery
Replies: 2
Views: 607
Forum: Repairs and Warranty Service 06-13-2022, 05:10 AM  
Should I fix my 40?
Posted By bdery
Replies: 55
Views: 1,584
I disagree about the mixed reviews. I was in your shoes, with the question of switching between the two. In my case I was also switching to full frame so the corners of the 40mm were a problem. Still, regarding rendering, I never looked back.

Your previous posts led me to understand that you intended to let go of the 40 anyway. If you DON'T want to do that, then by all means get it repaired!
Forum: Repairs and Warranty Service 06-10-2022, 05:25 AM  
Should I fix my 40?
Posted By bdery
Replies: 55
Views: 1,584
You need to consider this in the perspective of sunk cost. As is, you've already paid for the lens, that money is spent. Now, if you pay 100$ (sorry I don't think I have a pound sign on my keyboard, bear with me) will it let you resell the lens for more than that? You already say you don't need it and might look at the 43 as a replacement (fine reasoning I might add).

So as you don't intend to use the lens, you should only consider the price you can resell it, nothing else. By the way, 100$ to repair a lens isn't unfair I would think.

For the record, I had a similar problem with my DA21, a local repair shop opened it, replaced a few things, and it was back to being perfect. If you decide you don't want to pay for repairs, maybe you can have a go yourself, otherwise the lens has zero value, so you don't risk much.
Forum: Pentax Camera and Field Accessories 06-08-2022, 05:21 AM  
City / Travel Backpacking Nerds - New Pack...
Posted By bdery
Replies: 18
Views: 768
All good choices. Clik Elite are out of business, sadly. Think Tank and Mindshift Gear are two product lines in the same company.

A longer-term review/article about that bag if you're interested.
Forum: Pentax Camera and Field Accessories 06-07-2022, 05:10 AM  
City / Travel Backpacking Nerds - New Pack...
Posted By bdery
Replies: 18
Views: 768
Almost every bag will be ok.


That's by far the trickiest requirement. For this long lens, I have to disqualify the Mindshift Gear rotation180, they can't accommodate it, except maybe if you're willing to get their top insert. Even then, we'd have to measure I'm not sure it fits.

Easy peasy.


Most bags have an external pocket for this. Several also accept water bladders.

No problem there.

Sooooo... regarding that long lens.

One avenue is to get either a Nomatic MacKinnon or a Peak Design travel backpack, and with the proper insert configure the interior properly. In both cases you'll have some room left for the rest. But these bags are not truly meant for hiking.

another option is a Peak Design Everyday Backpack 30L, and place the lens vertically on one side thanks to the adjustable dividers. I've done something similar often and loved it. With the optional hip strap, the bag is comfortable for 1-day hiking.

Another avenue still (with bags I personally haven't used) is to go full-fledged multi-day setup with an Atlas or a Shimoda bag. You'll have to measure up stuff but clearly these companies should have a bag which fits that lens. Same for F-Stop. The price will scale quickly however.

Another yet, Mindshift Gear offers some bag (the UltraLite I think?) with full internal organization for photo gear. Again, configure it properly, and leave some of the volume for non-photo stuff.

These suggestions should get you pointed in the right direction.
Forum: Pentax Camera and Field Accessories 06-06-2022, 06:05 AM  
City / Travel Backpacking Nerds - New Pack...
Posted By bdery
Replies: 18
Views: 768
You seem to be looking at large bags. Will you be carrying only stuff for one day, in addition to what you listed? Otherwise these are probably too large.

My go-to travel bags, depending on the situation, are either:

Mindshift Gear Rotation180 34L Backpack Review - Introduction | Reviews

This one is my favourite for hiking, traveling with the family, when I expect to benefit from the water bladder, or when I expect to change lenses often. It's fantastic. I'd love if they made a slightly smaller version but with space for a water bladder.

Peak Design Everyday Backpack V2 and Backpack Zip Comparison Review - Introduction | Reviews

I use the Zip as my daily driver for work, but for slightly larger loads I prefer the EDB, especially with its top access. What a bag. Not as quick to change lenses (it needs to sling over one shoulder) but pretty good still, and the design on that bag is out of this world.

It really depends if you want more of a hiker's backpack or an everyday backpack. For the record, I've hiked with the Peak Design, and I toured Disney World with the Mindshift Gear, so both are possible.

An honorable mention is

Think Tank Urban Access 15 Review - Introduction | Reviews

Close to the Peak Design, not as quick to reconfigure but still excellent.

If you ARE looking for a larger bag, here are two options:

Wandrd Fernweh Hiking Backpack Review - Introduction | Reviews

(the company's Prvke could also be considered, I never warmed up to it but some love it)

Peak Design Travel Backpack Review - Introduction | Reviews

(they also now have a slightly smaller version without side access, except a review to be published soon).
Forum: Welcomes and Introductions 06-06-2022, 05:57 AM  
hello de france
Posted By bdery
Replies: 8
Views: 231
Bonjour et bienvenue à partir de Québec!
Forum: General Photography 05-31-2022, 05:41 AM  
Crazy Overpriced Items on Craiglist/Ebay etc
Posted By bdery
Replies: 188
Views: 19,865
I would say the original bears no link to the current asked price. The asked price is way overboard but it COULD have been fair regardless of the original price.
Forum: Pentax SLR Lens Discussion 05-31-2022, 05:39 AM  
Finally rolling it back to SLR. Seeking answers on FA Limited lenses
Posted By bdery
Replies: 15
Views: 886
There's an in-depth comparison review answering all your questions and then some:

HD vs. SMC Pentax FA Limited Lenses Review - Introduction | Reviews
Forum: Pentax SLR Lens Discussion 05-30-2022, 05:43 AM  
Focusing speed by lenses D FA 2.8/70-200 * and D FA 150-450
Posted By bdery
Replies: 13
Views: 751
You beat me to it. This forum offers in-depth reviews, with AF tests you can read and compare.
Forum: Pentax SLR Lens Discussion 05-27-2022, 05:36 AM  
Why no real lens measurements at
Posted By bdery
Replies: 69
Views: 2,288
You didn't make me feel uncomfortable! :) Just that I'm wary of myself or anyone else claiming a higher intelligence than other people.

I'll take your point of view as the compliment it's intended to be. Cheers!

Design, pre-production and full-scale production are quite different things. I fully agree that during design and pre-production phases, you'll want as much data as possible, and as detailed as you can. For production, you won't want to wait until a lens is assembled to learn you've made a mistake on step 2 of 37. So you'll get either strict tolerancing, with error margins you know about and can live with, or intermediate testing steps.
Forum: Pentax SLR Lens Discussion 05-26-2022, 05:31 AM  
Alone, All Alone
Posted By bdery
Replies: 14
Views: 989
Sigma and Tamron have deserted, but Irix, Laowa and others are still there!
Forum: Pentax SLR Lens Discussion 05-26-2022, 05:30 AM  
Why no real lens measurements at
Posted By bdery
Replies: 69
Views: 2,288
I would correct one thing: I doubt production lines frequently measure MTF. They probably measure tolerancing in other ways, with intermediate steps.

Or maybe just better trained in optics? :) Knowledge and brightness aren't the same. I feel comfortable saying I'm competent in optics (having a PhD in the field helps) but I'm not comfortable claiming I'm brighter than you or anyone else here :)
Forum: Photographic Equipment for Sale 05-25-2022, 05:08 AM  
For Sale: REDUCED Michael Kors Fossil Gen6 Bradshaw watch and many accessories, new
Posted By bdery
Replies: 2
Views: 607
Quick bump!
Forum: Pentax SLR Lens Discussion 05-24-2022, 05:17 AM  
Why no real lens measurements at
Posted By bdery
Replies: 69
Views: 2,288
Imagine what I had to do to test the 150-450mm with 1.4 TC for Pentaxforums! Asked permission to use a subterran garage with a 65m line-of-sight, used the heaviest tripod I could gain access to, use flashes daisy-chained to trigger optically (I didn't have a remote with enough range at that time), use 10 seconds mirror lock-up with ES, and take many many shots to get a valid one. Rinse and repeat for all apertures, center/edge/corner. Fun times.

When the photonics university R&D lab was developed at Laval university where I did my PhD, they:

1-physically separated the building from the rest of the university, classes, offices, etc, even though there were connecting corridors
2-separated the elevator which was on its own concrete slab, separate from the rest
3-pur all the ventilation machinery on another building
4-braced the building with concrete "arms" extending as far as the building's length
5-study natural vibration frequencies of the ground, as well as that generated by cars on nearby streets, and account for those
6-create dirt walls to further dampen unexpected vibrations
7-build in the ground instead of in the air
8-use piping with varying diameters so that waves would not propagate as well

I must be missing a lot that I didn't know about. Fantastic building, in any case.
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