http://www.lesjones.com/2011/06/15/effect-of-lens-focal-length-on-portraits/

http://annawu.com/blog/2011/09/focal-length-comparison/

http://www.mcpactions.com/blog/2010/07/21/the-ideal-focal-length-for-portraiture-a-photographers-experiment/

Announcement very soon.

Available at:

• http://www.amazon.com/Sony-16-35mm-Vario-Tessar-E-Mount-Lens/dp/B00NGTN25C/

I have a Lumix G 12-35mm f.28 mk1 with an unresponsive focus wheel. The focus itself works fine when operating through the camera - pressing the shutter, c-af in video etc - but the focus wheel on the lens itself has come loose from (what I assume is) the sensor underneath. If I hold it firmly and turn it will engage every now and again but for the most part it doesn't respond at all.

Has anyone had this happen/know how to fix these focus rings?

Specs

• 17 lenses in 12 groups
• 9 aperture blades, circular
• Minimum shooting distance - 0.38m
• Maximum magnification - 1: 5
• Image stabilization - up to 5 stops
• 82mm filters diameter
• Diameter × length - 89 mm × 111 mm
• Dust proof, drip proof construction
• New hood locking mech
• Electromagnetic aperture
• TAP-in Console compatible
• Weight - 905 g
• Price - $ 1299
• Preorders
• Nikon - https://www.adorama.com/tm24702nk.html
• Canon - https://www.adorama.com/tm24702eos.html
• Shipping - August 2nd

http://www.mkgrip.com/english.php?m=product&a=product_view&tpid=242&tid=243&id=133&nid=489

Specifications

• 10 lenses in 9 groups
• 7 aperture blades
• F16 min aperture
• 0,23m min focus distance
• 67mm filters
• 76×115mm dize
• 586g

0.234m macro mode, the magnification ratio is up to 1:1

The nearest focus distance can reach about 0.234m, and the magnification ratio is up to 1:1. Shooting in macro mode and infinity mode both can achieve good image quality, which is suitable for shooting in macro, portrait, landscape and other scenes.

Supports USB-free Firmware Upgrade 

Firmware of the lens can be upgraded through camera instead of using USB port, which not only meets the requirements of firmware upgrade and appearance design, but also avoids the incompatibility problems caused by different computer operating systems.（Note: this function needs to be supported by camera）

F2 Large Aperture

F2 bright and large aperture, easy to create beautiful bokeh effect and highlight the subject.

Built-in electromagnetic aperture, supports automatic exposure shooting  

Built-in electromagnetic aperture, supports M/Av/Tv/P/B and other shooting modes, and can effectively improve the accuracy and durability of the aperture control.

High precision manual focus, supports focus prompt

Adopts high precision focusing structure design, supports half-press shutter manual focus prompt.

Glass Lenses, Multi-coated

The whole series products are formed by glass lenses, adopting multi-coated technology, which effectively improve light transmittance and inhibit the ghost shadow and glare in photographing.

Seven Aperture Blades

The aperture blades are up to 7 pieces, which allows you to shoot the circular defocused spots, appropriately stopping down can also achieve the 14 astral effect.

Metal Bayonet, Outstanding durability

Adopts chrome high precision metal bayonet, which fits the camera body perfectly, and the bayonet is wear and corrosion resistant, durable in use.

Equipped with focus distance indicator

Equipped with focus distance indicator, it is convenient for you to estimate the distance of the subject.

Gold Plating Technology

Adopts gold plating metal contacts, effectively improves the signal conductivity and corrosion resistance.

Made for Sony E-mount, Canon EF mount and Reflex AR-I.

The Kickstarter will go live in November 2018 and delivery expected in early 2019.

• Compatible Cameras: FE-mount and E-mount cameras
• Optical Design: 9 elements in 8 groups
• Distance range: 0.3m to ∞, combined scale meter/feet
• Aperture: Manually controlled diaphragm, 13 aperture blades , Lowest value 16
• Filter Mount: Internal thread for 52mm filter; filter mount does not rotate.
• Surface Finish: Black anodized
• Length to bayonet mount: approx. 77.40mm (approx. 3.05in)
• Largest diameter: approx. 64.73mm (approx. 2.55in)
• Weight: approx. 535g (approx. 18.87oz)

SLR Magic extends it’s FE-mount lineup with the SLR Magic CINE 35mm F1.2 wide angle lens and SLR Magic CINE 75mm F1.4 telephoto lens. The products will be officially introduced during upcoming CINE GEAR 2016 show in Los Angeles.

The field of view of the SLR Magic CINE 35mm F1.2 and SLR Magic CINE 75mm F1.4 opens up many new creative composition opportunities, particularly in the fields of portrait, interior, architectural and landscape cinematography and photography.

We place our highest priority in the development on our lenses to fulfill the demands of professional cinematographers and photographers. The design and build of the the SLR Magic CINE 35mm F1.2 and SLR Magic CINE 75mm F1.4 is solid and reliable.

• Compatible Cameras: FE-mount and E-mount cameras
• Optical Design: 6 elements in 6 groups
• Distance range: 0.70m to ∞, combined scale meter/feet
• Aperture: Manually controlled diaphragm, 13 aperture blades , Lowest value 16
• Filter Mount: Internal thread for 52mm filter; filter mount does not rotate.
• Surface Finish: Black anodized
• Length to bayonet mount: approx. 78.68mm (approx. 3.09in)
• Largest diameter: approx. 64.67mm (approx. 2.55in)
• Weight: approx. 455g (approx. 16.05oz)

The SLR Magic CINE 35mm F1.2 and SLR Magic CINE 75mm F1.4 will be first presented at CINE GEAR 2016 show. There would be a demo at the ATOMOS booth in (Stage 16) during the show held in Paramount Studios in Los Angeles from 3rd to 4th of June 2016.

THE SLR Magic CINE 35mm F1.2 (MSRP: $499 US/ $3,299 RMB) and SLR Magic CINE 75mm F1.4 (MSRP: $499 US/ $3,299 RMB) will be available from authorised SLR Magic dealers by August, 2016.

Specs

• F2.8-F22
• 7 elements in 6 groups
• 7 diaphragm blades
• 8cm min focus distance
• no filters mount
• 45,2x25,5mm size
• 135g
• m43 mount only

Featuring a 210° angle of view, this lens delivers unique circular fisheye field of view on Micro four thirds cameras. The ultra-wide angle view allows photographers to create 360° panorama with ease. Despite the unique & ultra-wide perspective, the lens only weighs 0.3 pounds (135g).

New 42.5mm lens is available in sharp metallic black and silver, and delivers beautiful defocus to help you add more artistry and creativity into your photography. Offering a 42.5mm middle-telephoto focal distance (35mm camera equivalent: 85mm equivalent to 85mm on a 35mm camera), a high speed f/1.7 aperture, and a versatile focusing distance of 0.31 m, the lens can deliver portraits with a rich stereoscopic effect as well as close-ups with beautiful defocus.

The lens’ POWER O.I.S. system effectively compensates unwanted blur caused by handshake - not only small, fast movements but also large, slow ones - helping you get the results you want, even in low light situations. The POWER O.I.S system, alongside the 240fps Drive AF, delivers stable framing and precise focusing every time.

The 42.5mm portrait lens is available in black and silver from May 2015 for around 399 EUR.

• $399 at http://www.amazon.com/Panasonic-H-HS043K-42-5-85-1-2-16-Cameras/dp/B00H36U69Y/

Specs

• 9 elements in 8 groups
• 0.10m to ∞, combined scale meter/feet
• Manually controlled diaphragm, 7 aperture blades , lowest value 16
• Internal thread for 43mm filters, filter mount rotates while focusing.
• Filter adapter (included) for 52mm filters
• 41.4mm x 46,1mm
• 110g
• m43 lens
• around $299 at https://www.bhphotovideo.com/c/product/1322738-REG/slr_magic_slr8m4_8mm_f_4_lens.html

Hong Kong, China (Feburary 25, 2017) - SLR Magic expands the micro four thirds lens lineup with the new SLR Magic 8mm F4 ultra wide angle lens. The product will be officially introduced during upcoming BVE 2017 fair in Excel London.

The field of view corresponds to a 16mm lens in 35mm format and this fast wide angle of view opens up many new creative composition opportunities, particularly in the fields of interior, architectural and landscape cinematography and photography. Additionally, light weight and compact size of the SLR Magic 8mm F4 ideal for aerial photography as well as multi-camera setup 360 VR.

We place our highest priority in the development on our lenses to fulfill the demands of professional cinematographers and photographers. The design and build of the SLR Magic 8mm F4 is solid and reliable.

The SLR Magic 8mm F4 (MSRP: $349 US) will be available from authorized SLR Magic dealers starting March 2017.

The SLR Magic 8mm F4 will be first presented at the BVE 2017 show. The SLR Magic stand would be in (S1-8 G30 Holdan Ltd.) during the BVE show which are to be held in Excel London from Feburary 28th to March 2nd 2017.

Demo footage by volunteer tester:

SLR Magic is currently looking for volunteers to test this lens at a special price. If interested:

1. Send an email to support@slrmagic.com with the subject "SLR Magic 8mm F4 volunteer".
2. Include sample videos/photos or link to photo/video reviews you have done in the past.

https://sonyalpha.blog/2018/09/09/neewer-35mm-f1-2/

Available at https://www.amazon.com/Sigma-693954-50-100mm-Standard-Canon/dp/B01C3SCKHW/

• APS-C format lens
• 21 elements in 15 groups,
• 3 FLD glasses, 1 SLD glass, 1 high-refractive-index, high-dispersion glass, 3 high refractive index SLD glasses.
• New HSM motor
• 9-blade circular aperture
• 82mm filter thread
• Minimum focus distance 95cm
• Maximum diameter 93.5mm
• Inner focus, inner zoom
• Magnification ratio 1:6.7
• 170.7 x 93.5mm
• 1490g
• Available in Canon EF, Nikon F and Sigma SA Mount.

MTF Announce Full-Frame Lenses from Leading Glass Manufacturer NiSi

Lenses

• Nisi F3 25mm Full Frame lens T2.1
• Nisi F3 35mm Full Frame lens T2.0
• Nisi F3 50mm Full Frame lens T2.0
• Nisi F3 75mm Full Frame lens T2.0
• Nisi F3 100mm Full Frame lens T2.0

Highlights

• Covers Full-Frame Format
• PL Mount/Canon EF Mount/Sony E Mount
• T2.0-T22 Clickless Aperture Range
• Ultra Low Dispersion
• High Resolution
• Retro Cinema Style
• 12-Blade Iris
• Same physical attributes across the lens line
• Geared Focus and Iris Control Rings
• Pure performance in film

Preorder

$999 per lens at http://en.nisifilters.com/nisi-f3-prime-cinema-lens-pre-order

It is with great pleasure that MTF Services, exclusive supplier of NiSi Cinema Filters, announce the arrival of the brand's new range of full-frame, prime lenses.

MTF Service Announce F3 Lenses from NiSi

Launching in 25mm T2.1, 35mm T2.0, 50mm T2.0, 75mm T2.0 and 100mm CF T2.0 formats, the new range of premium lenses will debut during NAB in Las Vegas between the 7th -12th April

The lenses, which boast an original full-frame camera design, high resolution, extremely low dispersion and special flare performance, will be available from MTF Services shortly after the US event.

Along with individual lenses, MTF will also be offering specially designed F3 kits, which will include a complete set of lenses, from 25-100mm, along with a NiSi 4x5.65 Allure Mist white 1/4 filter, a NiSi 4x5.65 Allure Mist Black 1/4 filter and a NiSi 4x5.65 Polarizer, all packaged in a tough hardshell case.

Expected release date is mid 2018.

Specs

• 7 Elements in 6 Groups
• Multi Coated
• Manual focus
• Maximum Aperture: f/1.1
• Minimum Aperture: f/16
• Minimum Focus Distance - 0.50m
• 13 Diaphragm Blades
• 52mm filters
• L 60.5mm x W 64.0mm
• E-mount lens
• 450g
• Price around $400

Specifications

• 22 elements in 17 groups (including 6 Super ED and 2 ED glass elements)
• Image angle - 76.7 ° -29.1 °
• T number - T2.9
• Largest aperture - F2.8
• Smallest aperture - F22
• 9 aperture blades, circular opening
• Smoothly adjustable iris
• Min focus - 0.85m, 0,38m in macro mode
• Front diameter - 85 mm
• Filters - Ø 82 mm
• 87 mm × 206.6 mm
• 1.080 g
• 3.999,- Euro
• Available in June 2018

Electromagnetic Aperture, Automatic Exposure Shooting: This lens is built-in with electromagnetic aperture, which supports M/Av/Tv/P/B shooting mode.

F1.4 Bright and Large Aperture: Real bokeh Background blur helps to highlight the subject easily. Even in low light environment, you can take photograph with low sensitivity and relatively high shutter speed.

USB Firmware Upgrade: This lens is equipped with USB port. To keep best performance and compatibility of this lens, you can download the latest firmware and update this lens independently.

Live View Focusing (Lv): This lens supports live view focusing (Lv). When Lv mode is on, this lens can focus from special angles, or focus precisely from the broadened view on the display screen.

Glass Optical Lens, Multilayer Coating: The whole series of this product adopts glass optical lens and multilayer coating technology to effectively increase light transmittance and control backlight ghost image and glare.

7 pcs of Diaphragm Leaves: This Lens has 7pcs of diaphragm leaves, which helps to take picture of circular defocused spots as well as 14-star effect if you stop down the aperture.

Gold-plated Contact, Durable Metal Mount: This lens adopts gold-plated contact and high-accuracy chrome-plated metal mount. It's wearable, corrosion-resistant, and highly consistent with the camera.

Focus Modes: Auto Focus (AF) and Manual Focus (MF): This lens supports auto focus and manual focus. The focus mode can be selected according to practical requirement.

Focus Distance Indicator: This Lens is equipped with focus distance indicator, which helps you to judge the distance and accomplish manual focus.