- PHOTO CAMERA TIPS -: lens

Showing posts with label lens. Show all posts

Thursday, February 28, 2019

Camera Lens Repair Articles

camera nikkor contact repair

What To Do With Dust Inside Lens

How to Do DIY Dust Cleaning Surgery on 6 Popular Canon and Nikon Lenses

How to Fix Blinking “Err” Error on Nikon DSLR Cameras

Nikon Lens Mount Repair

How to replace bayonet mount ring on Nikon AF-S DX Zoom Nikkor 18-55mm

Nikon Lens Repair a-k-b.info

How to clean NIKKOR lens CPU contacts

Richard Haw

Repair Fundamentals Lens & Camera Repair Fundamentals

Lens Repair Articles

Anyway, here are the blog posts on the fundamentals:

Infinity Focus Calibration

Classic Nikon Maintenance to see if I updated anything.

Repair: Camera Leather 10.5.19 D800

Repair Fundamentals Lens Repair Articles Repair Articles Photography

DIY Fundus photography - wiki

DIY nonmydriatic fundus camera - American Academy

Smartphone Ophthalmoscope & Slit Lamp - oDocs Eye

www.flanger.cz/prodam?h=1&q=Objektiv+Nikkor+70-200%2F2%2C8+VR

nikon
nikkor
service
repair

Monday, October 1, 2018

Nikon 50mm 1.4 af d repair

Working with the aperture blades in AF NIKKOR 50mm 1:1.4 D

AF NIKKOR 50mm 1:1.4D Desmontando encaixe

Nikon Nikkor 50 mm 1.8 Series-e : Repair - Part I

Nikon Nikkor 50 mm 1.8 Series-e : Repair - Part II

Oil on the aperture blades in AF Nikkor 35mm 1:2

Nikon AF-S Nikkor 50mm 1.4G repairing and dissasembly, Part 1

A full review of the Nikon 50mm 1.8D vs 1.8G and 1.4D vs 1.4G

Start Shaping Colors with a Secret Code in Photoshop!

Why Chinese Manufacturing Wins

https://en.wikipedia.org/wiki/Shenzhen

Friday, January 5, 2018

2018 new camera lenses expectations

Nikon and CES 2018. Expectations Still High as Event Roster Released

CES 2018
Nikon booth with the new Nikkor 180-400mm f/4E TC 1.4 FL ED VR lens

Nikor 180-400mm should be available in March 2018 for $12,397 :D :-( :-(

Nikon D5s Rumor CES 2018

MWC 2018: what we want to see | TechRadar

2018 new photo mobile expectations

Thursday, June 1, 2017

How to test Lens - testing and resources

How to Test Your Lens

High Resolution Test Patterns

Norman Koren photography

small backup:

Chart details

The test charts come in several flavors, identified by their intended length when reproduced on film or a digital sensor, gamma, length in pixels, and ink spread correction. Similar test charts, with the sacle omitted, can be created using Imatest Test Charts.
Chart length: The names of the charts below (2.5 and 5mm) are the intended lengths of the chart when reproduced on film or a digital sensor. They are designed to be printed at 50, 80, or 100x magnification (relative to the intended size on the film or sensor) to avoid printer limitations.

2.5 mm charts (illustrated above) are designed to be printed 25 cm (9.84 inches) long (100x magnification) on a 4.5x11 inch strip— half of a letter sized or A4 sheet. The 7086 pixel long charts are best for printing at multiples of 720 dpi (Epson printers). The 5906 pixel long charts are best for printing at multiples of 600 dpi (Canon and HP printers). 2.5 mm charts are recommended for compact digital cameras, which have tiny sensors (11 mm diagonal or less) and lenses with relatively short focal length.5 mm charts are designed to be printed 25 cm (9.84 inches) long (50x magnification), which fits on a 4.25x11 inch strip— half of a letter sized or A4 sheet, or 40 cm (15.75 inches) long (80x magnification), which fits on half of an A3 sheet.

You can print these charts any size you want as long as you note the magnification and photograph them at the appropriate distance, but I recommend the standard sizes to avoid confusion.
Print magnification: advantages/disadvantages

On the Epson 1270 or 2200 with semigloss paper at 1440 dpi, the high spatial frequency bars are clearest when printed at the highest magnifications. At 100x, bars are clear with no tonal shift up to 200 lp/mm. At 80x, some tonal shift due to ink spreading is noticeable starting at 170 lp/mm, but the bars are still distinct at 200 lp/mm. At 50x, tonal shift starts around 120 lp/mm. Bars are still distinct at 200 lp/mm, but MTF is slightly reduced. Realistically speaking, 50x is adequate for film and digital SLRs; there is little real action above 100 lp/mm. But since "resolutions" as high as 150 lp/mm have occasionally been published, many of you (myself included) may be curious about what you can see over 100 lp/mm. A portion of a 400 dpi Epson 1640SU scan of a 50x chart printed on the Epson 1270 at 1440 dpi, between 80 and 200 lp/mm (gamma = 1.5), is shown below. This is the worst case, and it looks pretty good. I strongly recommend that you examine your printed charts under a loupe (at least 10x) to be sure the bar and sine patterns look good at high spatial frequencies.

How we test lenses

The Imaging Resource Test Suite More than you probably wanted to know about testing digital cameras

Testing and Targets

Lens test image quality

sharp
sharpnes
lens test
micro contrast

Friday, March 31, 2017

Lens flare or photoshop

Odlesk v objektivu nebo photoshoem
barevný sluneční flek

lens flare photoshop plugin
lens flare photoshop brush free
sun flare photoshop action free

sun flare photoshop action

paint the moon blog

http://paintthemoon.net/category/photo-techniques

How to Add a Sun Flare to Your Images Using Photoshop

Unlock the secrets of Lens Flare Photoshop plugin

Photoshop | How to add Fake Sun Flare Photo Effect Tutorial ?? - YouTube

Jak na lens flare, aneb krásné odlesky v protisvětle

How to Add Sunlight to Photos in Photoshop

Autumn color effect | Photoshop tutorial | Soft light look

How I Did This Color Effect In Photoshop (Autumn Color)

Fall/Automn Warm Edit Autumn | Photoshop Tutorial

Outdoor Portrait Edit (Child) | Photoshop cc Tutorial

soft warm light effect | photoshop tutorial | photo effects

sun
light
slunce

Sunday, February 26, 2017

Best lenses for Nikon D7100

Best lenses for the 24M-Pix Nikon D7100

Best lenses for Nikon D7100

Wednesday, February 1, 2017

The Problem with Modern Lenses - MTF vs Micro-contrast

The Problem with Modern Lenses
MTF vs Micro-contrast

The Problem with Modern Lenses

Thoughts on the Right Camera and Lenses

The Lens Intention Diagram

sigma art 35 mm f/1.4 flat lens low micro-contrast
sigma art 50 mm f/1.4 flat lens low micro-contrast

The flattening of modern lenses or the death of 3D pop

and How a lens works

Glass becoming evil

Glass becoming more evil

What is lost at the end of all this?

How to view and compare depth rendition

7 elements Nikkor AF 50mm 1.4D vs 13 elements (with 3 ED glass and 1 Aspherical ) Sigma ART

On a wide landscape, the distance between foreground and background objects is captured clearly on the depth lens but confused on the flat lens. The depth lens also capture drastically more tonal nuances than the flat one.

The next lenses of the future will be flat lenses for sure

More observations on low-element count lenses.

They are older lenses: lenses made for film (people like shooting film because it feels “more real", now you know why lol) with less rounded aperture blades and less recent coating.
They don’t perform as good as flat lenses at maximum aperture: One needs to learn how to close the aperture well according to the light. The bokeh won’t be as creamy as a new flat lens.
They mostly won’t provide corner to corner sharpness until f11: Downside of less glass correction. Wide angle lenses are the most to suffer low-element count.
They are very cheap to buy used most of the time: Most of the world has been sold onto upgrading to a flat lens.
The theory mostly applies to prime lenses: I have tried many low-element count zooms and the differences are more subtle.
The theory applies to focal lengths above 35mm: there are many compromises made to design lenses of 24 and wider.
Ideal low-element count number is below 9
Most low-element count lenses aren’t fast lenses
They don't have plastic elements: The effect of 1 plastic element (or called "hybrid aspherical") is quite damaging to the depth.
The higher the element count, the closer it needs to be used only at max aperture.
Not well reviewed: every review site on the internet will shit on them.
Darn cheap: The used market is full of them. Chances are the user is selling them for purchasing expensive flat lenses.

More observations on high-element count lenses.

They are modern lenses: Made with the latest sauce on “rounded aperture blades” and lens coating mostly for better bokeh and wide open sharpness.
Maximum aperture champions: they provide maxed out values of sharpness and bokeh (most of the time).
Nightcrawlers: Their high correction gives them amazing flare resistance at night.
They can only be used at max aperture: High-element count lenses have “3d pop” only when the background is blurred. When the background is visible, it is flattened on the subject.
Easier to use for beginners and casual consumers: They are corrected for any aperture.
Well reviewed: huge promotional campaign on the lenses on every lens review site/blog.
Heavy: lots of glass in there.
More expensive: tons of materials more.

Compromises to be made, to buy both or not?

A high element count lens isn’t necessarily bad and a depth lens isn’t necessarily good. I would buy such a lens for its “bokeh effect” when used on max aperture or its ability to provide sharp corners on extreme occasions of need (a specific landscape picture that needs corner detail) then quickly go back to the depth lens for general purpose. Some people prioritise sharpness more than depth . In my case, I tell stories in my images. The lenses I use must be able to respect the composition I see with my two eyes and depth information is also part of the story. On some occasions, I would require “bokeh quality” to help shape the mood, on most occasions I need context. Photography for me is the reproduction of reality. I lose fidelity by using a higher element count lens.

Youtube Playlist on optics and depth rendition
Quick follow-up lens comparison article on my blog
A video that compares flat and depth lenses (thank you Robiro from dpreview forums)

https://www.flickr.com/photos/yannick_khong/sets/72157649585031022/page1

Micro-contrast is a premium attribute in some brands while being spread more evenly on others.

Canon has two line of lenses clearly directed at two drastically different users: L (enthusiast and professional users) and non-L (occasional and casual users). While some non-L or third party lenses might score higher than L lenses on test charts, Canon L lenses are the better Canon lenses with micro-contrast and will have superior rendition to the non-L. The price gap between a Non-L and a L lens is close to double price. Canon is also starting to release replacement version to their original L primes lenses, many of which lose their micro-contrast in favour of resolution.
Nikkor lenses all have okay to excellent micro-contrast as this attribute is spread more evenly across the entire optical library, but usually cost a little more than Canon’s affordable non-L lenses depending on wether it is from the Ai/Ai-S, AF-D or AF-S line (many AF-S G prime lenses have inferior micro-contrast to their older AF-D line)
Voigtlander SL lenses have amazing micro-contrast (sometimes at the cost of sharpness) and cost just a little more than Nikkor lenses.
Many Zeiss ZF/ZE Classic lenses have world leading micro-contrast and are perhaps the most premium lenses for dSLRs. The Zeiss OTUS and Milvus lenses have reduced micro-contrast in favor of resolution.
Sigma ART lenses do not have micro-contrast at all.
Sony E-mount lenses lineups are similar to the Canon model. Non-L lenses are replaced by G and non-G lenses. L lenses are replaced by premium Sony lenses with Zeiss design and coating. Lately their goals are to reduce this attribute in favour of resolution in the G-Master lenses.
Fuji XF lenses all have good to great micro-contrast like Nikkor lenses but they require the use of Iridient Developer (Mac OS only) to reveal their true nature.
M43 lenses have awful to very good micro-contrast but it is harder to identify which ones since they are still figuring out ways to exploit that attribute at the sensor-level (they might have reached solution in the GX8).

Otestujte si svůj objektiv – difrakce aneb ohybová vada

https://nikonblog.cz/otestujte-si-svuj-objektiv-difrakce-aneb-ohybova-vada/

sigma art 35 mm flat lense
low-pass filtr
mikro kontrast

Monday, January 2, 2017

Repair Lens Nikkor 50mm

Repair Lens Nikkor 50mm f/2K (New-Nikkor)

Repair: Nikkor 50mm f/2K (New-Nikkor)

Repair: Nikkor 105mm f/2.5KIn "nikon,lens repair,lens maintenance,nikon repair,"

Repair: AF-Nikkor 70-210mm f/4In "nikon,lens repair,lens maintenance,nikon repair,"

Repair: Tokina 28-70 AT-X PROIn "nikon,lens repair,lens maintenance,nikon repair,"

RightToRepare
#RightToRepare

Wednesday, November 30, 2016

Repair Lens Nikkor 20mm

Repair Lens Nikkor 20mm f/3.5 Ai-S

Before We Begin:

If this is the first attempt at opening a lens then I suggest that you read my previous posts regarding screws & drivers, grease and other things. Also read regarding the tools that you will need in order to fix your Nikkors.

I highly suggest that you read these primers before you begin (for beginners):

Reading these primers should lessen the chance of ruining your lens if you are a beginner. Also before opening up any lens, always look for other people who have done so in Youtube and the internet. Information is scarce, vague and scattered (that is why I started this) but you can still find some information if you search carefully.

I highly recommend that you also read my working with helicoids post because this is very important and getting it wrong can ruin your day. If I can force you to read this, I would. It is that important!

For more advanced topics, you can read my fungus removal post as a start. This post has a lot of useful information here and there and it will be beneficial for you to read this ...

continue

Camera and Lens Repair Essentials - tools

Nikon AF-Nikkor 18mm f/2.8D ultrawideangle lens

#RightToRepare
Right To Repare
https://twitter.com/hashtag/righttorepair

Coruption Corporation lobby against

Tuesday, November 29, 2016

How to Clean Dust From Inside Your Lens

Discover Hidden Lens Problems - Short Lens Check with some Lenses

Buying second hand lenses with Karl Taylor

Is Tokina 100mm f2.8 macro lens worth it? TEARDOWN & Review

Fungus, Haze and Condensation on Optical Lenses (Glaspilz)

Cleaning Fungus From Camera Lens / SLR

What To Do With Dust Inside Lens

clean lens
spare parts
repare lens

Monday, November 28, 2016

Repair Fundamentals Lens & Camera

These were made in order to show people what are the important tools and practices for repairing cameras and lenses. If you are new to this, I advise that you read every article. I wrote this so that newcomers will not be frustrated because there is almost nothing on the internet on these topics.

Lens Repair Articles

Lens Repair Articles:

Here is the core of my blog. I intend to have the most comprehensive database found on the internet for everything related to the repair of classic Nikkor lenses. As of this date, I believe that this blog is the only one of its kind and I currently have the most articles on this subject. I wrote these to prevent people from making mistakes while repairing their own lenses. The articles contain a brief history of the highlighted lens as well as plenty of sample pictures taken with it. I do update each article occasionally so please check on the facebook page named Classic Nikon Maintenance to see if I updated anything.

General Repair

Camera Repair & General Repair Articles:

Here are my articles pertaining to general camera repair and some DIY articles for lenses or anything related to them. Just like the lens repair articles these will also be updated on an occasional basis. Please check them out, many things here are exclusive to this blog.

Custom split image microprism focusing screens for DSLR cameras...

http://focusingscreen.com/

NIKON D800 D750 D600 D610 Df Focusing Screen Installation Instruction

3000 - New Taiwan Dollar equals - around 100 USD

Wednesday, November 23, 2016

How lens works

How Lenses Function (CanonOfficial)

EF Lens Technology Canon Product

Canon vs. Nikon: Why I want to switch to Nikon, but can't fully

The DEATH of the Consumer Camera