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Forum: Pentax DSLR Discussion 12-15-2020, 03:44 AM  
To buy or not to buy the Pentax 28-105, or the question of walking-around with a K1
Posted By Bui
Replies: 38
Views: 2,033
Thank you for advice. In fact except for some D-FA* lenses who are either too big, too expensive or both, I prefer high quality and automation lenses for travel convenience and I'm willing to pay for them, hence even my A28/2 for example, is great, I rarely use it but rather my modern 20-40 and DA 35ltd.

---------- Post added 12-15-20 at 03:48 AM ----------



Very useful advice. I don't plan to get rid of the APSC system at all, maybe selling a few lenses if I use their FF equivalences more. I look forward to experiencing the K1 perspective, and I will targeting a 31 and a 43 soon.
Forum: Pentax DSLR Discussion 12-15-2020, 01:55 AM  
To buy or not to buy the Pentax 28-105, or the question of walking-around with a K1
Posted By Bui
Replies: 38
Views: 2,033
Wow lots of replies, thank you!



How do you feel the # between K3ii + 16-85 and K1ii + 28-105? I mean looking at them as a combination, rather than an individual contest between the 2 lenses. For landscape, for example,

---------- Post added 12-15-20 at 01:59 AM ----------



I understood that you meant better image quality from the FF combo? The 16-85 to me is the best general standard lens for a crop camera, and I'm sure the 28-105 is too, for a K1. My question is rather, "I have a KP with 16-85 mounted and a K1, should I buy a good all-around lens for my K1, or it's already well covered with my KP"?

---------- Post added 12-15-20 at 02:07 AM ----------



Thank you, this is what I'm curious about. I decided to go for the K1ii very quickly without really thinking about future, since the price was so good, but now I realise there could be a lot of duplication, and a relatively waste (or not optimal) use of my APSC equipments, if I'm happy with the K1 and can live with the extra weight. Bringing 2 cameras at once is not yet a consideration for me at this point.
Forum: Pentax DSLR Discussion 12-14-2020, 01:58 PM  
To buy or not to buy the Pentax 28-105, or the question of walking-around with a K1
Posted By Bui
Replies: 38
Views: 2,033
So, I have just bought a K1ii. Do I need it? I don't think so, having been happy with a KP and a decent set of DA Limiteds + a few others DA* and so on. Do I want it? Absolutely, I'm always curious what FF looks like, and I also want to try a K1 with the 31-43-77 trio to see what all the fuss is about. Why did I buy it? Because I saw a used K1ii at an unbeatable price, and also because I have decided that the K3iii is not what I want.

In terms of lenses, I have the DA* 11-18 which you (the forum) say works in FF from 15mm. I also have the legacy A28/2, the DA* 55, the 77, and the macro 100, so I'm good. As we're heading to Christmas vacation in the mountain (after 1 month and a half under lock-down in France), we're raring to go, and of course I look forward to having new experience with my new camera. But I rarely travel without at least 1 general and WR lens (for example for the KP it would be the 16-85). So I'm looking at the 28-105. I did some research, found a few discussion in the forum, and it seems the conclusion is, it's a very good lens, and "an equivalent of the 16-85 on APSC". Wait, what? So then why should I buy this lens to walk-around a 1.5 kilograms package, to have similar quality (and even less flexibility) to the 1.2 kilograms KP + 16-85?

Or the question is, for someone owning both Pentax FF and APSC system, you buy the 28-105 because image quality of the FF combo is better (resolution, noise, etc), or because you don't want to bring 2 cameras?
Forum: Pentax SLR Lens Discussion 11-05-2020, 05:58 AM  
What do I gain, going from KP/K3iii+DA 16-50 to K1ii+DFA 24-70?
Posted By Bui
Replies: 36
Views: 1,940
It is really a problem. I currently own all DA limiteds: 15-21-35-40 in SMC and 70-20/40 in HD. I never try any of the FA's. I purchased a 43 from a forum member last month but it was a sad story, the lens got lost during the long way shipping from the US to Europe. That's said, the FAs are much more expensive than the DAs, so having some of all of them would not be that straightforward, and most likely I will have to sell some of mine currently.
Forum: Pentax SLR Lens Discussion 11-05-2020, 04:03 AM  
What do I gain, going from KP/K3iii+DA 16-50 to K1ii+DFA 24-70?
Posted By Bui
Replies: 36
Views: 1,940
Thank you for your comments, I think I've made up my mind. I will hunt down ideally an used K1ii, starting from a few FF primes I currently have, getting a 24-70/28-105 as next step, and see when I can put my hands on the 3 Amigos. That way I will be experiencing something new: full frame. It may or it may not fit with me, but I'm not afraid of selling things that don't work with me. The KP will stay with me in any case, for when I want portability. Both K1ii and K3iii does not hold a candle to it in this regards, and considering the K3iii's improvements do not mean a lot to me, I will wait for it's review, reduced price, or ideally a KPii.
Forum: Pentax SLR Lens Discussion 10-29-2020, 03:38 AM  
What do I gain, going from KP/K3iii+DA 16-50 to K1ii+DFA 24-70?
Posted By Bui
Replies: 36
Views: 1,940
That's a great sum up, though I would assume a few of them are applicable for the K3iii. It's really a toss up.

---------- Post added 10-29-20 at 03:40 AM ----------



I think he meant other technology e.g. image processing, AF algorithm and tracking, etc. To me when I have to sacrifice weight I want IQ, so IQ technology will be of most important. In this sense if the K3iii is not expected to surpass the K1ii (High ISO, dynamic range), then K1ii is a no brainer

---------- Post added 10-29-20 at 03:43 AM ----------



This is interesting. I know the possibilities for trying new things with FF, shallower portrait for example, but landscape is still what I do most, and I'm not clear if FF makes a difference. But as you said, it's noticeably better.
Forum: Pentax SLR Lens Discussion 10-28-2020, 02:32 AM  
What do I gain, going from KP/K3iii+DA 16-50 to K1ii+DFA 24-70?
Posted By Bui
Replies: 36
Views: 1,940
It's a good question. I do not shot action, and I do burst shooting like 1-2 times every year. The most "action" shots I do is my daughter running in the forest, or a moving deer. Frankly, I have to admit, I don't really need to move on from the KP, it's good for me most of the time, and the fact that I went for it instead of the K3ii, was because of its form factor, and the non-requirement in fast action. The K3iii is not super attractive to me, if it were a KPii instead I would jump in immediately. If I upgrade, and it's not a KP type, meaning I will have to sacrifice compactness and portability, then I want the best IQ possible, that's why the K1/K1ii is looking nice, and especially with expected price of K3iii at 2000 euros (I can get a K1ii used at much less than that).

---------- Post added 10-28-20 at 02:36 AM ----------



Thank you for jumping in. The 24-70 is just a reference, because comparing (more or less) equivalent scenarios is easier, hence K1ii+24-70, since I use KP+16-50 quite a lot. If I ever get a K1, I know I will eventually get FA limiteds to try them on their home, for example. But it will be expensive, and for the time being, the KP with my APSC lenses are fine. On the other hand, most of the people who switched to FF say they don't use their K3/KP (a lot) anymore. So I'm quite curious.
Forum: Pentax SLR Lens Discussion 10-27-2020, 07:10 AM  
What do I gain, going from KP/K3iii+DA 16-50 to K1ii+DFA 24-70?
Posted By Bui
Replies: 36
Views: 1,940
I'm sorry if the question does not make sense, or it has been asked 9999 times in the forum, but it's still not clear at all to me.

Context: I have a bunch of DA Limited and DA* lenses, using it with a KP I bought used 3 years ago. The KP is excellent, but (but but but) when new shiny thing arrives, one can't help but start staring at it. Let's just say I want even better dynamic range and iso performance, better autofocus too, while more resolution does not harm. That's why I have been saving and preparing a bit of fund to invest in a new camera next year. Obvious candidate is the K3iii, but since the price would be >2000 euros, a K1/K1ii is increasingly attractive even if I am never really serious with moving to FF. After all I love trying new things.

I like landscape photography, and occasional portrait.

The cons of going for the K1 rather than K3iii, to me:

- Weight and size. Portability.
- Cost of future lenses. I have a few good FF or FF-ready primes so I have time

What about the pros? I like the KP+16-50 a lot, so I could imagine to go for the K1/24-70 combo if I go that route, because the price is quite good, but does that really make a difference?
Forum: Pentax SLR Lens Discussion 09-10-2020, 11:40 PM  
Upgrade 12-24 to 11-18?
Posted By Bui
Replies: 41
Views: 2,525
No not yet it will arrive next week. Will see if I have time to do such comparison. Never done such before.
Forum: Pentax SLR Lens Discussion 09-10-2020, 06:42 AM  
Upgrade 12-24 to 11-18?
Posted By Bui
Replies: 41
Views: 2,525
So, if you have to choose between your wife, and a lens, which lens would you choose?

I found a great deal of a brand new 11-18, couldn't help my self but clicking the "Pay" button. There is nothing wrong with my 12-24 and 14 but the temptation is hard. At least I'm confident I can resell the lens if it doesn't fit my expectation, though I think it's unlikely.
Forum: Pentax SLR Lens Discussion 09-03-2020, 07:47 AM  
Upgrade 12-24 to 11-18?
Posted By Bui
Replies: 41
Views: 2,525
The rent before splashing money is a good idea but it's difficult to rent Pentax equipments where I live. Usually I counter that by only buy used lenses at good price, so if I don't like them I can resell later at similar price, so no loss. If I ever get the 11-18, surely the 12-24 will have to go, but the 14 is a hard case, I quite like its images, even better than the 15, though the 15 will also stay due to its limited advantage. Also I have to be careful because since the COVID I have observed a big drop in used Pentax gears price.

---------- Post added 09-03-20 at 07:49 AM ----------



It was a joke, but yeah sometimes I feel a bit guilty after purchasing a lens, thinking that money could be spent for something else for my family. That doesn't stop me from acquiring a lot of overlapping lenses though.

---------- Post added 09-03-20 at 07:55 AM ----------



This, to tell you the truth I like the photos from K1+15-30 people post on this forum a lot. I know there are a lot of skills and such, but even technically, the sharpness, clarity, contrast and colour are obvious to see. I want those from my photos. Since I'm not going to FF anytime soon, if the 11-18 can be comparable with the 15-30 optically (I have a KP which is a baby-K1), it might be a good investment. The 12-24 is actually a very good lens, very sharp and versatile, but for some reasons I found the images a bit lacking, be it colour or contrast I can't explain, I just like photos from the 14 a bit more.

---------- Post added 09-03-20 at 07:57 AM ----------



Thank you, aside from flare resistance, do find improvement in other areas when it comes to image quality?

---------- Post added 09-03-20 at 07:58 AM ----------



Thank you, aside from flare resistance, do find improvement in other areas when it comes to image quality?

---------- Post added 09-03-20 at 08:46 AM ----------

How does Pentax's warranty work by the way? The question sound silly, but fact is I have never bought anything brand new from Pentax, if I go for this lens it will be likely my very first new purchase. If I have trouble with the lens, or if it has issues, like decentering, etc, would Pentax support?
Forum: Pentax SLR Lens Discussion 09-02-2020, 06:59 AM  
Upgrade 12-24 to 11-18?
Posted By Bui
Replies: 41
Views: 2,525
You call it LBA, I call it "striving for better":lol: recently I have been becoming more and more interested in shooting wide angle, starting from the 15 Ltd for some occasional wide landscape or with the sun, then a quick grab of the 14 last autumn before our trip to Austria, because the 15 was dropped and became decentered. I have since then re bought the 15, for when I need compactness, and the 12-24, used too. This year it has been almost the 12-24 as my default lens, due to its versatility, being a zoom, and the fact that it can go to 24mm. COVID 19 has stopped us from air traveling, but driving instead, so compactness of the 15 is not needed.

Having said that, the new DA* 11-18 has been tempting me more and more because:

- AW: non of my wide angle lens is WR, which is sometimes annoying, every trip I have at least 1-2 rainy days.
- Build quality: the 12-24 is not bad, but its design and build quality is outdated, especially sitting next to Ltd or * lenses
- DC and f2.8 are nice.

But mostly I want more image quality. I kind of lazy when it comes to setting up a shot, partly because I travel with a toddler and a very impatient wife, so I want equipments that can deliver even with less ideal conditions (e.g. no tripod, not waiting for better light etc). the 12-24 is good, but for some reasons I find images from the 14 better. I wonder how much better image quality I can get from the 11-18, considering the same shooting conditions? It's quite hard to find a direct comparison of this lenses with others.

I decide not to move to FF, even if it's technically the best option, due to size/weight and cost.

The cons would be:
- Price. It can be soften somewhat by selling my 12-24, and street price has now lowered a bit, closer to 1000e mark. I won't sell the 15, and perhaps the 14 either, it's kind of an unique lens.
- Bulkiness. Looks like its not much fatter than the 16-50, so not bad, but it will takes time to get used to a 700g default lens.
- My marriage. No, but seriously, having 3 wide angle lenses already that are working, why am I even thinking about this?

Your thoughts?
- Speaking of default lens, 18mm vs 24mm is a big difference, will be more lenses swap, unfortunately
Forum: Pentax SLR Lens Discussion 07-19-2020, 10:57 PM  
Pentax 20-40mm or Sigma 18-35mm
Posted By Bui
Replies: 28
Views: 2,187
Aside from the obvious differences in size, weight and speed, it depends on what you value regarding IQ. For example the 20-40 will be unlikely to be sharper than the Tamron 17-50 which youíre not happy with, but it gives much nicer images to my eyes. The Sigma is likely to edge the Pentax when it comes to sharpness, according to test, but the Pentax does not have autofocus issue, and handling is a joy. In term of rendering I can only say the Pentax is great, never use the Sigma.
Forum: Pentax SLR Lens Discussion 06-07-2020, 10:30 PM  
Light zoom for hiking
Posted By Bui
Replies: 13
Views: 945
To keep very high quality and maintaining flexibility at the same time it will be hard to keep the weight down. A KP + 18-135 is 250g lighter than a K3 + Sigma 17-50. Noticeable but not that big of a deal. I usually hike with my Kp and 16-85/16-50, and sometimes when we go to places we know already I substitute the zoom for a 21 and/or 40 the combo is very light and of course I lose flexibility.

Recently I bought an used K-01 for a very cheap price, and I plan to use it with the 18-50 retracted zoom. I think when it comes to Pentax ApsC this is the ultimate lightweight zoom package you can go for. In terms of image quality I will need to play with it a bit but I think it will be fine.
Forum: Pentax SLR Lens Discussion 05-26-2020, 02:44 AM  
Lens design question: what make a lens bigger/smaller?
Posted By Bui
Replies: 38
Views: 1,591
Thanks for your simple explanation. I have a few follow-up questions, if you don't mind :)

- Focal length = distance from the lens to the focal plane. From which point/part of the lens though?
- About registration distance, do you happen to know the registration distance of Pentax cameras?
- For a given focal length/registration distance, is this possible (in theory) to add unlimited number of elements, or there can be only a certain number of elements before the lens exceeds its own focal length?
- For a given focal length/aperture/design, what need to change, roughly, if for example, I want the Sigma to cover full frame sensor?



Sorry I did not mean the front element, but the size of the iris of each lens respectively, it's easily to see the iris/opening of the Sigma is much smaller than the Pentax, which is logical to me since it's almost 2 times shorter, having the same f1.4. What confuses me is the fact the the Sigma is fatter than the Pentax, even if it has smaller elements (in term of diameter).

My sideway question: I notice some lenses have big front element, but small iris. The Iris size is obviously respectable to it's aperture/focal length, but why the front element needs to be so much bigger? To gather light?



I think you're right, Sigma lenses, especially Art lenses are the ultra-corrected type in my perspective, they tend to have a lot of elements, hence very sharp but very heavy. I'm a fan of small and light lenses, hence the Sigma 30 is the only Sigma lens that "qualifies" in my book (considering it's a 1.4 metal internal focus motor lens) with acceptable size and weight and quite low number of elements to Sigma standard. The price to pay is purple fringing all over the place and less sharpness but I'm fine with that.
Forum: Pentax SLR Lens Discussion 05-18-2020, 08:19 AM  
Lens design question: what make a lens bigger/smaller?
Posted By Bui
Replies: 38
Views: 1,591
I'm bad at physics so don't laugh at me :lol: I just want to understand more my lenses from physical point of view. Here are my 2 fastest lenses: the recently acquired Pentax DA* 55mm 1.4 (on the left), and the Sigma Art 30mm 1.4 (on the right). Spec wise, they're quite similar: f1.4, 9 elements in 8 groups, has an internal motor (SDM/HSM), except for focal length of course.

My question is:

- Why the Pentax is just slightly longer than the Sigma, having almost 2 times the focal length?
- Why the Sigma is even bigger than the Pentax (the 2nd photo)? Since it's 30mm, to maintain the f1.4, its "opening" should be nearly 2 times smaller that the Pentax's, I can see in the photo, but why its overall size is still bigger? The Pentax is better optimized, or the SDM is small than HSM, or there is another reason?
Forum: Pentax SLR Lens Discussion 05-18-2020, 08:03 AM  
What is this fog-like looking on my lens?
Posted By Bui
Replies: 10
Views: 1,235
Finally I have time and manage to get rid of some laziness to open up my A28 f2 again. I have now the front elements part, which I can see the haze inside. The problem is I can't separate them, this part seems to go tightly together. Based on the diagram one of you posted above, no element is glued together, but here I find it very difficult to break them up. Any idea?
Forum: Pentax SLR Lens Discussion 05-10-2020, 11:46 PM  
Confession game: how many lenses do you have? Why do you keep them? Which was let go?
Posted By Bui
Replies: 140
Views: 12,110
So uhm despite owning several nifty fifties as mentioned in my opening post, not to mention 16-50, 50-135, 70 ltd, during the lock down another member joined: DA* 55, so far its job is to photograph my walls and some random objects in the house. Why not, the other lenses are either too long, too heavy or too slow for that anyway :-)
Forum: Pentax K-30 & K-50 05-05-2020, 01:26 AM  
My new K30 problem: shutter stuck close after replacing solenoid
Posted By Bui
Replies: 9
Views: 903
No the mirror is fine, as you can see in my second photo, I have to hold the mirror up by hand to see the stuck shutter.

---------- Post added 05-05-20 at 01:27 AM ----------



I will try to examine if one has came off. Otherwise I'm thinking about reversing the operation, and re test, maybe with some lucks the shutter will release?
Forum: Pentax K-30 & K-50 05-04-2020, 01:41 AM  
My new K30 problem: shutter stuck close after replacing solenoid
Posted By Bui
Replies: 9
Views: 903
I'm sorry for not being clear, I mean obviously the camera has aperture block issue, but before the operation I was playing with it using f22 (or the smallest aperture of the lens on the camera), because at that aperture aperture block is no longer a problem. It took hundreds of photos without any issue, so I thought maybe its shutter mechanism is still fine?

In fact, what exactly happened was, after the first try, I put the battery in, turned on the camera and tested, the shutter was blocked right after the first click, and exposure failed also, all photos were white. I assume my repair was unsuccessful, so I did a second try: unsolder the new solenoid, took it out, put it back, solder it again. This time the camera works perfectly in live view (exposure and everything, at all apertures), but the shutter remains stuck every-time unless I used mirror lockup mode to clean the sensor.

I concluded that:

- The new solenoid actually works
- I did something wrong during the first try leading to the shutter being blocked
- If I can "reset" the shutter, while maintaining the current new solenoid, the camera will resume its service.

As of now it remains unusable for me, since I rarely use LV, and using the viewfinder is not possible since the shutter is blocking almost all light.

Any idea?
Forum: Pentax K-30 & K-50 05-01-2020, 09:27 AM  
My new K30 problem: shutter stuck close after replacing solenoid
Posted By Bui
Replies: 9
Views: 903
Yes itís possible but at the same time I think itís not very high chance though, the camera is approx 10k clicks, and I play with it before doing the surgery (shooting at f22) and there was no issue.
Forum: Pentax K-30 & K-50 05-01-2020, 06:18 AM  
My new K30 problem: shutter stuck close after replacing solenoid
Posted By Bui
Replies: 9
Views: 903
So today I tried to fix my K30 aperture block, since I recently obtained a white solenoid. The "surgery "following your DIY guide here was fine (I actually did it successfully in the past with a K50), however, I have a new problem: the shutter is not stuck close. The weird thing is, live view works fine, I can take photos at any aperture, so I guess the new solenoid has worked. But whenever I turn of LV, the shutter remains closed again. I tried turning on, off the camera, using Bulb mode, removing the battery but nothing has worked yet.

Could you please help me with your idea?

I attached 2 photos: how I soldered the new solenoid, and how the current shutter looks like.
Forum: Digital Processing, Software, and Printing 04-28-2020, 12:41 AM  
Hardware: How to identify the right CPU to upgrade?
Posted By Bui
Replies: 19
Views: 1,384
Thank you, I came close to buying the FX-4170 to replace my X4 955 for 70 euros, but I hesitated, since the boost in performance would be marginal at best, so after a lot of consideration and research, I've decided to upgrade to Ryzen 5 3600 system. Quite a hit in the budget, since it's almost a whole system upgrade (CPU + Mainboard + RAM + SSD in this thread Help me optimize Lightroom performance with limited specs - PentaxForums.com) but I tried to stretch it so the new build can last for at least a few years without me worrying about another upgrade. Still waiting for the components to arrive.
Forum: Pentax SLR Lens Discussion 04-27-2020, 01:12 AM  
White HD DA 18-50mm F4-5.6 DC WR RE
Posted By Bui
Replies: 9
Views: 704
Sure I did not mean it was bad, for a kit lens it performs very well, and of course comparing it with those much more expensive and corrected lenses is not very fair to it but of course since owning them, the 18-50 had been sitting in the drawer, and I realized whenever I wanted to go compact, I would pick the 21mm instead, therefore I sold my 18-50. But for what it is, a silent WR zoom lens in a ridiculously small and light form, it's a very good lens. Sometimes I still wonder how much better the HD version is, and would like to try it when possible.
Forum: Pentax SLR Lens Discussion 04-25-2020, 02:48 PM  
White HD DA 18-50mm F4-5.6 DC WR RE
Posted By Bui
Replies: 9
Views: 704
Itís super light and compact, maybe the smallest zoom lens in the world, also WR and silent focus, but handling is bad due to compact plastic form and retract design. Optically I found itís okay, but noticeably worse than premium zooms like 20-40 or 16-85 which I also own.
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