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Rokinon Reflex 300mm f/6.3 UMC CS Lens for Sony A

BH #RO30063SA • MFR #300M-S
Key Features
  • Aperture Range: Fixed f/6.3
  • For APS-C Sensors, 450mm (35mm Equiv.)
  • Catadioptric Telephoto Lens
  • UMC Multi-Layer Anti-Reflective Coating
The Rokinon Reflex 300mm f/6.3 UMC CS Lens is a mirror lens designed specifically for use on APS-C-format Sony A-mount DSLR cameras. The lens' Cassegrain design enables it to achieve a 450mm 35mm-equivalent focal length perspective within a compact and lightweight form factor that is significantly smaller than a traditional 300mm lens. It features a fixed f/6.3 aperture and utilizes manual focus operation for focusing as closely as 3.6'.
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Rokinon 300mm f/6.3 Reflex Overview

The Rokinon Reflex 300mm f/6.3 UMC CS Lens is a mirror lens designed specifically for use on APS-C-format Sony A-mount DSLR cameras. The lens' Cassegrain design enables it to achieve a 450mm 35mm-equivalent focal length perspective within a compact and lightweight form factor that is significantly smaller than a traditional 300mm lens. It features a fixed f/6.3 aperture and utilizes manual focus operation for focusing as closely as 3.6'.

The mirror construction of the lens inherently works to reduce chromatic aberrations and a UMC (Ultra Multi Coated) coating has been applied to reduce surface reflections, lens flare, and ghosting while also contributing to improved overall contrast.

Mirror lens designed specifically for APS-C-format Sony A-mount DSLR cameras.
Catadioptric system with Cassegrain design helps to reduce the overall size of the lens while still providing a 35mm-equivalent focal length of 450mm.
A UMC coating has been applied to the lens elements to improve clarity, minimize reflections, and enhance overall image contrast.
UPC: 084438762785

Rokinon 300mm f/6.3 Reflex Specs

Focal Length300mm (35mm Equivalent Focal Length: 450mm)
Maximum Aperturef/6.3
Minimum Aperturef/6.3
Lens MountSony A
Lens Format CoverageAPS-C
Angle of View5.5°
Minimum Focus Distance3.61' / 1.1 m
Optical Design8 Elements in 8 Groups
Focus TypeManual Focus
Image StabilizationNo
Filter Size25.5 mm (Rear)
Dimensions (ø x L)2.54 x 2.98" / 64.52 x 75.69 mm
Weight9.17 oz / 260 g
Packaging Info
Package Weight1.2 lb
Box Dimensions (LxWxH)7.6 x 5.7 x 4.3"

Rokinon 300mm f/6.3 Reflex Reviews

Pleasantly Surprised

By Baron
Rated 4 out of 5
Date: 2021-05-27

I have a lot of experience with mirror/reflex lenses so I had low expectations, but I'm getting good shots with this. It's a lot more compact and lighter than most reflexes that are built for full-frame. Focus action is pleasant and smooth. There's very strong vignetting and image quality isn't as good at the edges, so this is definitely a character lens; it has quite the vintage rendering. But for going hiking, or even for pottering about getting photos with a warm, glowy rendering with some charm, it's actually great. If subjects are smallish like birds, it serves well to draw attention to the subject and turn the surroundings into a slightly dreamy background.

Decent Cheap Mirror Lens with Flaws

By Dan
Rated 4 out of 5
Date: 2020-05-25

Inexpensive, I'd not used a mirror lens since my film days with an OM-1. Sheltered in place in Honolulu with only my Nikon D750 and one lens, I ordered this to reconnect to my youth where everything was manual. The reflex 300mm f/6.3 is certainly that. A major challenge is focus. While the focus indicator does light up, the image is NOT in focus. Zoomed in on live-view it is possible to achieve focus, but the focus indicator will not be lit. The attached photos detail the difference. Each were shot on a tripod: 1/250 sec, ISO 50, mirror up, wired remote shutter release. The images are Lightroom edited with settings exactly the same for each picture. A bit of vignetting is also noted, but that is easily fixed in Lightroom if needed.

A fun lens for experimental photography

By Christopher
Rated 4 out of 5
Date: 2020-01-24

If you're looking for a pro lens to snap sharp images of moving subjects from a distance, don't bother with this. If you are curious about the characteristics of catadioptric lenses, want to experiment with crazy telephoto compression and interesting bokeh, it is more than worth the money. Personally I think the bokeh produced by this lens is really interesting. It is possible to shoot fast moving subjects at a distance as evidenced by the bird photo, but you'll need good light and a steady hand. High ISO, image stabilization in-camera (such as in Olympus OM-D cameras) and focus peaking are key. The photos attached to this review were all taken with an Olympus OM-D E-M10 camera without the use of a tripod, so hand-held shooting is definitely possible with this lens especially with good lighting.

Great For Astrophotography

By Frank
Rated 5 out of 5
Date: 2019-10-23

I use this mirror lens specifically for astrophotography for use on a SkyTracker Pro mount. Reason is this lens is very light and I don't need to counter balance it. However, the only way to get perfect critical focus for astrophotography (and you can with this lens) is to use a SharpStar2 by Lonely Speck (Bahtinov Mask). This lens is well made and seems to be rock-solid. I use a SharpStar2 by Lonely Speck with all my lenses for astro work, regardless of focal length. Takes the guesswork out of getting perfect focus. Again - this 300mm Rokinon mirror lens is great for astro.

Tough lens to use

By Anthony
Rated 2 out of 5
Date: 2018-06-29

Although the final result, when you eventually achieve it, is well worth the money, the number of shots needed makes it very hard work. If you really need a light 300 mm walk around lens and have very steady hands then it may be for you, but I certainly would have liked a tripod with me.

Catadioptric lens for Nikon F mount

By BC
Rated 4 out of 5
Date: 2017-10-09

Excellent lens, but very difficult to focus in the range near infinity which is my intention for using it. astro

Great lens, if you know what you're buying

By Thomas
Rated 5 out of 5
Date: 2021-04-19

This is a mirror lens, so it will not be contrasty. IF it was film days, this would be terrible, but contrast is super easy to add in post. It's sharp and the focus is well dampened. It could have a long throw, but it still works. On my Panasonic G9 the IBIS works well enough that I can hand hold it, but it really shines on a tripod. It's is so light, that you don't mind carrying it on birding hikes. This lens is the best value you will find for a long lens.

A 300mm for $300 is Pretty Good

By Edward R
Rated 4 out of 5
Date: 2020-09-18

This lens is an excellent buy. Of course, if you have the money, a FujiFilm prime or zoom will be much easier to use and produce a sharper image. It has a fixed aperture at 6.3. You must use it on a tripod. Most difficult is a good focus. Maybe it's my eyesight but I shoot 3-5 shots of a subject, checking focus each time. That way I am assured of at least one good shot. I also use delayed shutter release to avoid me shaking the tripod. The bird photo was shot at ISO 800, f 6.3, 1/90sec. Fujifilm XT-2. First photo is the raw photo, second was worked on in Lightroom. I am very happy to have it in my camera bag.

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question

Is this lenses all manual (focus and iris)? Can it be used with BlackMagic 2.5k mount MFT?
Asked by: Anonymous
The BlackMagic Cinema MFT mount camera requires use of manual focus and manually adjustable aperture lenses. The silver Rokinon Reflex 300mm f/6.3 ED UMC CS Lens will mount on the camera but will not allow you to adjust the aperture of the lens as this lens has a fixed aperture of f6.3. The benefit of the camera using the MFT mount is the availability of adapters which will allow one to mount various manual focus/manual aperture lenses to the camera.
Answered by: Yos O.
Date published: 2018-08-28

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Will this work with an extender such as my KENKO C-AF1 1.5X DG?
Asked by: Anonymous
I would not recommend this approach. Further, I would advise that the Canon 75-300mm lens may be a more desirable option, as it is more affordable, has autofocus, a faster aperture, and can be used with a teleconverter: http://bhpho.to/1nuVUxF
Answered by: Heather S.
Date published: 2018-08-25

Can this use with tel converter?

Can this use with tel converter?
Asked by: Mei-Ling
Hi, teleconverters work best with lenses with a maximum aperture of f/2.8; this lens has a maximum aperture of f/6.3, so, although you could mount the lens to a teleconverter, there would be no autofocus or auto exposure.
Answered by: Boyd
Date published: 2020-01-12

how much space there is between the REAR 25.5mm ...

how much space there is between the REAR 25.5mm threads and the outside of the mount? I would like to use my existing AP filters which would require putting an adapter on the rear threads.
Asked by: Harrison
Please direct your inquiry to Rokinon; RokinonDistributed By - ELITE BRANDS INC.Tel: (800) 441-1100 Website http://www.rokinon.com/ Email [email protected]
Answered by: Rob
Date published: 2020-06-15

question

Is this a good lens to capture my son in marching band on the football field? Night performances under lights. Will this work on my 7d camera?
Asked by: Patty M.
This is a fix focal length and manual focusing lens with a preatty small aperture it will be compatible with your canon 7d , but for a moving object in a low light , I wouldn't recommend it, instead I will use some telephoto zoom with auto focus and a better f stop performance.
Answered by: James B.
Date published: 2020-07-19

Hi is it work with sony full frame like a7 iii ? ...

Hi is it work with sony full frame like a7 iii ? Or is it need adapter?
Asked by: husin
The Rokinon Reflex 300mm f/6.3 ED UMC CS Lens for Sony E Mount is designed for the Sony E-mount used on the Sony Alpha a7 III Mirrorless Digital Camera. No adapter is designed to connect the lens to the camera. However, do note that the Rokinon Reflex 300mm f/6.3 ED UMC CS Lens for Sony E Mount is designed for the smaller APS-C sensor. As such, you would need to use the APS-C Crop Mode when using this lens on your camera. You can access this setting by going to the MENU on your camera and going to [Camera Settings 1] → [APSC/Super 35mm] → [APS-C S35 Shoot: Manual] and [ON].
Answered by: Manzell
Date published: 2020-03-08

question

i am knew to this so that being said is this lens good for zooming in from a far distance?
Asked by: omar a.
This is a telephoto lens, so yes, it is used to shoot from far distances.
Answered by: Heather S.
Date published: 2018-08-25

question

Is this lenses all manual (focus and iris)? Can it be used with BlackMagic 2.5k mount MFT?
Asked by: Anonymous
The BlackMagic Cinema MFT mount camera requires use of manual focus and manually adjustable aperture lenses. The black Rokinon Reflex 300mm f/6.3 ED UMC CS Lens will mount on the camera but will not allow you to adjust the aperture of the lens as this lens has a fixed aperture of f6.3. The benefit of the camera using the MFT mount is the availability of adapters which will allow one to mount various manual focus/manual aperture lenses to the camera.
Answered by: Yos O.
Date published: 2018-08-28
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