bayindirh

bayindirh

Lives in Turkey Ankara, Turkey
Works as a Computer Scientist
Has a website at http://hakan.bayindir.org
Joined on May 7, 2018

Comments

Total: 277, showing: 1 – 20
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In reply to:

jonas ar: But the mount diameter is too tiny to design well performing lenses. Something surely must be wrong with this test 😉

@lawny, No I've read what I've written, also all the statements from the camera manufacturers, et. al.

I'm an engineer by trade, and I look at the results. Despite the claimed disadvantages, E mount lenses perform very well, and can compete with especially well designed members of the lens world. Sony FE85 is a budget lens, and its performance is indicative. Why? It's not a lens which has ZA/G/GM special sauce. It's just a run of the mill lens for consumers, but even without special consideration, it can perform well. That's "something".

Sony's lenses are 10-50% more expensive, I already knew that before buying into the Sony system, however $2,100 RF 50mm is not exactly "dirt cheap". Yes It's f/1.2, but there's no native f/1.8 for RF, then we will be able to compare. Nikon's S series lenses won't be "dirt cheap" either, so that difference will melt away it seems.

Last, but not the least, if Sony can build a lens with 20FPS AF capability with that MTF for $2000, that's not expensive

Link | Posted on Mar 12, 2019 at 08:57 UTC
In reply to:

jonas ar: But the mount diameter is too tiny to design well performing lenses. Something surely must be wrong with this test 😉

@lawny13
Yet there is 9 FE lenses on the first page of DxOMark lens benchmarks, and 6 of these lenses are made by Sony. Furthermore, one of them is a "standard/budget" FE lens, again made by Sony.

https://www.dxomark.com/category/lens-reviews/

Link | Posted on Mar 12, 2019 at 08:37 UTC
In reply to:

jonas ar: But the mount diameter is too tiny to design well performing lenses. Something surely must be wrong with this test 😉

I'm thinking the same thing. That E mount cannot compare with the new RF and Z mounts. It's small, puny. Like a pinhole. :D

No, no. Sony can't produce good lenses. They're not a serious, professional camera company after all.

Pfft... This much sarcasm really depletes to create and write. This is a behemoth of a lens which can AF 20FPS without miss and be the sharpest 135mm. Congrats Sony. Keep it up!

Link | Posted on Mar 11, 2019 at 20:30 UTC
On article DPReview TV: Why waveforms are better than histograms (330 comments in total)
In reply to:

bayindirh: Nevercenter's Camerabag pro also contains waveforms for photo and video. Nevercenter's tool is amazing since it processes videos and photos exactly the same way, and it can do very nice things.

@studko, I know. However I wanted to point out that post processing software vendors are already experimenting with waveforms in their software. So, if it's loved that much in post processing, then it may trickle down to cameras' firmware.

Link | Posted on Mar 10, 2019 at 19:36 UTC
On article DPReview TV: Why waveforms are better than histograms (330 comments in total)
In reply to:

PDL: It’s easy to add this (waveforms) into cameras. Really?
Spoken by a person who has never written a program or developed embedded software in their life. So please show us your qualifications on how you know it is “easy”.
However, if there were additional tools built into the cameras to assist in exposure that would be a good thing. Other considerations would be how much more power this would take and that effect on battery life, heat generation, acceptable response time, will this occur before going through the JPEG engine and such. This is not a “simple” addition to the overall camera environment.
On the other hand, I have five fingers.

I'm an HPC programmer. I generally develop scientific stuff, and do embedded for hobby. HPC's requirement is very similar to embedded (efficiency, determinism, minimum resource usage / maximum performance, extreme reliability), however the scale is much bigger. If you can optimize the main loop and save a second, you can can save hours during execution.

Sorry for your situation, are you still writing code?

Link | Posted on Mar 9, 2019 at 20:48 UTC
On article DPReview TV: Why waveforms are better than histograms (330 comments in total)
In reply to:

PDL: It’s easy to add this (waveforms) into cameras. Really?
Spoken by a person who has never written a program or developed embedded software in their life. So please show us your qualifications on how you know it is “easy”.
However, if there were additional tools built into the cameras to assist in exposure that would be a good thing. Other considerations would be how much more power this would take and that effect on battery life, heat generation, acceptable response time, will this occur before going through the JPEG engine and such. This is not a “simple” addition to the overall camera environment.
On the other hand, I have five fingers.

I can say that implementing waveforms are relatively easy. From my estimation, it's load on the processor will be very similar to computing histograms.

Link | Posted on Mar 9, 2019 at 20:35 UTC
On article DPReview TV: Why waveforms are better than histograms (330 comments in total)

Nevercenter's Camerabag pro also contains waveforms for photo and video. Nevercenter's tool is amazing since it processes videos and photos exactly the same way, and it can do very nice things.

Link | Posted on Mar 9, 2019 at 20:33 UTC as 74th comment | 2 replies
In reply to:

lili23: WOW. Canon is very aggressive while Sony and Nikon aren't. Sony! you will lose your market soon enough if you dont release more lenses with unique specs!

@lili23
These f/1.2 lenses are magnificent, their performance is unmistakable. However, they are not exactly "approachable" lenses.

50mm f/1.2: $2,100
28-70 f/2: $3,000

Sony has a "practical" and "professional" line ups in place.
50mm f/1.8: $223.
55mm f/1.8 ZA: $950.
50mm f/1.4 ZA: $1,398

85mm f/1.8: $573
85mm f/1.4: $1,800
Both of these lenses are on the first page of DxOMark lens benchmarks.

With the ISO performance of Sony, you don't need f/1.2 lenses except for DoF reasons. Also they are exceptionally expensive as we can see.

Sony is being reasonable and building approachable lenses. I'd rather have a top notch, affordable f/1.8 rather than a halo f/1.2 which I can not justify unless I'm a working pro.

Link | Posted on Mar 5, 2019 at 20:16 UTC
In reply to:

lili23: WOW. Canon is very aggressive while Sony and Nikon aren't. Sony! you will lose your market soon enough if you dont release more lenses with unique specs!

Like f1.8/135 GM is not unique enough with its AF speed at 20FPS and hitting the intended point all the time.

Sony has a boat load of lenses in the catalogue already, and for unique specs, having really compact, very well performing and approachable 1.8-2.8 lenses at 28/35/50/55/85mm range with outstanding capabilities for their size is unique enough already.

Yes, Nikon f1.8/50 S is fantastic. As Canon's new RF lenses, however they are all top tier glass, and we are yet to see affordable and well-behaving glass from them. If that puny E mount can have a compact 85mm which can run on par with its GM sibling, or can mount some of the sharpest lenses (Sony 90 G, Sony 55 ZA), I'm more than happy with what I have.

Competition is good, but seeing them in the field and talking over facts is even better.

Link | Posted on Mar 5, 2019 at 19:27 UTC
In reply to:

eugene1979: useless piece of glass and plastic.

you need very fast shutter speed (1/500 or less) in order to be able to shoot wild animals (f.e. in the forest, where lighting conditions are poor), so you'll have to increase ISO setting and you'll get lots of noise with that small m43 sensor.

the same is true for action sports.

only FF is capable of shooting those genres.

@danieljcox, with the latest improvements in the FF sensors (Sony MK3 bodies, Nikon Z series), you can shoot in unbelievably low light with little to non-existent noise, with very acceptable dynamic range (See https://www.dpreview.com/reviews/image-comparison?attr18=lowlight&attr13_0=olympus_em1ii&attr13_1=olympus_em1x&attr13_2=nikon_z6&attr13_3=sony_a7iii&attr15_0=jpeg&attr15_1=jpeg&attr15_2=jpeg&attr15_3=jpeg&attr16_0=12800&attr16_1=12800&attr16_2=12800&attr16_3=12800&attr126_0=1&attr126_1=1&normalization=full&widget=1&x=-0.12339850860196114&y=-0.9640090921011962 ). So, physics is physics & there is no hype.

@eugene1979 OTOH, a m43 system is perfectly capable in stadium lighting or in forest. In daylight, where most shots are taken, even the most shady places are well in to territory of m43 systems. So, this is not useless glass, but a very clever and interesting move indeed.

Lots of videos prove that m43 can deliver in nature. No need to bash m43.

Link | Posted on Mar 4, 2019 at 08:26 UTC
In reply to:

Julian: I would love to see the video of them applying a band saw to this lens... I assume thats how they cut these in 2...

I have also shared four videos down the thread. Three modern ones were water jets, that’s all right. However, one of the videos is showing an old lens is cut in half with a bandsaw. I have also seen another modern video (Pentax K-1 IIRC) is cut in half with a bandsaw. Will also share it if I ever find it again.

Link | Posted on Mar 2, 2019 at 18:22 UTC
In reply to:

Einride: How do they do this? A super fast, super thin diamond saw blade? Water jet? Lasers?

Canon should be using bubblejets not inkjets. :)

Link | Posted on Mar 2, 2019 at 12:47 UTC
In reply to:

Julian: I would love to see the video of them applying a band saw to this lens... I assume thats how they cut these in 2...

Bandsaw is also used at the past. There are videos in this thread.

Link | Posted on Mar 2, 2019 at 12:45 UTC
In reply to:

Einride: How do they do this? A super fast, super thin diamond saw blade? Water jet? Lasers?

I've found some waterjet and bandsaw videos.

Canon lens, waterjet: https://www.youtube.com/watch?v=weWVFb_c2zk
Canon SLR, waterjet: https://www.youtube.com/watch?v=ssFlCSb_wLs
Another Canon lens, waterjet: https://www.youtube.com/watch?v=DRyVeyD1muM
A (possibly) Tokina 35-135, with lubricated and cooled bandsaw: https://www.youtube.com/watch?v=YA99qq0vM_g

Link | Posted on Mar 1, 2019 at 15:46 UTC
In reply to:

Einride: How do they do this? A super fast, super thin diamond saw blade? Water jet? Lasers?

On the contrary. A well cooled, lubricated and slow saw blade or diamond saw. However the finest blades/saws are used.

They may also polish with even finer (with a belt sander or stone) as a finish. I've watched a video of it, but forgot where it is.

Link | Posted on Mar 1, 2019 at 14:07 UTC
On article CP+ 2019: a look at the Pentax 85mm F1.4 and KP Custom (190 comments in total)
In reply to:

PrakticaB: ALthough I am sure the new 85 will be a great lens, I can't stop loving my tiny sweet Pentax DA70/2,4 :)).
And the combination of colours shown on the KP is definitely not of the best taste. I mean, I would not wear this colours together..

I think that KP looks sweet and attractive. Also the additions/choices they made feels so Japanese to me. So the color choice and branding is again very Japanese.

However, beauty is in the eye of the beholder.

Link | Posted on Mar 1, 2019 at 14:02 UTC
On article CP+ 2019: a look at the Pentax 85mm F1.4 and KP Custom (190 comments in total)
In reply to:

benvision: Hmmm, this looks like a Sigma 85 Art with a new skin :)

@Kilo, also don't forget the two openings and the transparency. It similarly shows the other side when you look from either end. This is certainly a copy.

Link | Posted on Mar 1, 2019 at 13:59 UTC

Ikea's Ladda battery charger is one of the best chargers on the market too. It's simple appearance hides a very stable and fast fault detecting charger with four independent channels. Technical review is here: https://lygte-info.dk/review/Review%20Charger%20Ikea%20Ladda%20YH-990BF%20UK.html

Link | Posted on Feb 28, 2019 at 18:18 UTC as 4th comment
In reply to:

jackie semple: Ok with carry carry-on luggage in Passenger aircraft, So is this about bulk transportation of batteries?

The sentence you quoted says that these devices can be carried on carry-on, not checked. So you can travel unhampered.

Link | Posted on Feb 28, 2019 at 17:25 UTC
In reply to:

Matt Random: I really wish Skylum put as much time into fulfilling their promises for Luminar as they put into running contests, creating partnerships, sending marketing emails and creating new apps based on their mediocre AI technology.

@Matt Which promises they didn't fulfill?
@EMs, Why Skylum crash landed with Luminar?

I'm just genuinely interested.

Link | Posted on Feb 25, 2019 at 06:50 UTC
Total: 277, showing: 1 – 20
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