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Wide angle Lenses with focal lengths shorter than 14mm.

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  #1  
Old 28th May 2015
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Which one ? 8mm or 7-14mm

If you could buy just one which would it be and why?
  • Olympus 8 mm M.ZUIKO f1.8 Fisheye
  • Olympus 7-14 mm M.ZUIKO f2.8

Looking at the specs only it would seem the 7-14 would cover the same angle of view as the 8mm.

Olympus must have a reason for producing the 8mm, does the 8mm give a different result to the 7-14 set to 8mm? e.g. is the 8mm Fisheye going to give a circular image?

I am puzzled as to the use of the 8mm hence my post asking for your thoughts.
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Old 28th May 2015
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Re: Which one ? 8mm or 7-14mm

I'd be surprised if the AOV of the 8 isn't wider than the 7-14. Also, f1.8 gathers about three times the light of f2.8. It your into astrophotography, that matters a lot.
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  #3  
Old 28th May 2015
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Re: Which one ? 8mm or 7-14mm

A fisheye should give 180 degree angle of view and indeed the Olympus one does. I have not seen any examples but that could be 180 on the diagonal so you get a rectangular image or it could be 180 degrees on the vertical in which case you get a circular image. The construction of a fisheye means that you can not use the focal length as aguide to the AOV.

I (personaly) would go for the 7-14mm as it is going to give a rectilinear image rather than trying to de-fish a fisheye image and I do far more interior shots than funny perspective ones and any night sky shots always tend to be bounded by trees so a true 180 degreee view would be wasted on me.
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Old 28th May 2015
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Re: Which one ? 8mm or 7-14mm

Thanks for the info, OM User provides a great explanation.

I looked at the Nikon fisheye and it is a 16mm and Nikon have a 14-24mm ultra wide angle zoom so there is obviously something different about the fish eye and OM User's explanation clears up this confusion.
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Old 28th May 2015
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Re: Which one ? 8mm or 7-14mm

The 8mm Fisheye is a "full frame" fisheye which produces an image circle larger than the sensor to give a rectangular, but distorted image. The diagonal angle of view is 180 degrees. "Circular" fisheye lenses (not produced for m4/3) produce an image circle smaller than the sensor and give a circular image with 180 degree FOV in all directions. The 8mm probably has "equisolid angle" mapping so that each pixel "sees" light which subtends an equal solid angle.

See here re. fisheye lenses in general.https://en.wikipedia.org/wiki/Fisheye_lens

The 7-14 mm lens has a diagonal angle of view of 114 degrees @ 7mm.

Regards.
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Old 29th May 2015
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Re: Which one ? 8mm or 7-14mm

is the 8mm a much better lens than the Samsung 7.5???????
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Old 29th May 2015
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Re: Which one ? 8mm or 7-14mm

7-14 for me.
I love wide angle lenses for landscapes.
Being fairly new to this m4/3 game I enjoy using the 9-18.
Now if only the 7-14 was the same size as the 9-18
Still a fairly big lens.
The reason for switching to the M4/3 system for me was to reduce size and weight.

Although I enjoy seeing fisheye images, I find the guide price for the 8mm a tad high for a lens that I'd only use once in a blue moon for gimmicy purposes but that doesn't mean it won't be the ideal lens for some photographers.

Mike
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Old 29th May 2015
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Re: Which one ? 8mm or 7-14mm

I've always found in life you get what you pay for with a few exceptions ie the 1.8 45mm Olympus exceptional quality at a terrific price.

Back to the main question I'd buy the 7-14mm because it would get used more than the 8mm considering my style of photography.

Tom
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Old 29th May 2015
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Re: Which one ? 8mm or 7-14mm

Quote:
Originally Posted by yorky View Post
is the 8mm a much better lens than the Samsung 7.5???????
Don't know about the Samsung 7.5mm but I have a Samyang 14mm for my Canons and it is one helluva sharp lens.
Images I've seen on Flickr taken with the Samyang 7.5mm are equally stunning.
I wouldn't say no to this lens at around a third of the price of the Olympus
Non AF & Stabilization wouldn't be a problem due to focus peaking and in-camera stability

Mike
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Old 29th May 2015
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Re: Which one ? 8mm or 7-14mm

Quote:
Originally Posted by yorky View Post
is the 8mm a much better lens than the Samsung 7.5???????
Optically, probably not - but it does have AF for what it's worth on this type of lens.
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Old 30th May 2015
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Re: Which one ? 8mm or 7-14mm

There are some sample photos taken with the Oly 8mm fisheye in this mini review:

http://slrgear.com/reviews/showproduct.php?product=1799
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Old 31st May 2015
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Re: Which one ? 8mm or 7-14mm

Looks like a quality lens but for the very few times I would use it I'd be as well using the Fisheye effect in the SCN mode
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Old 31st May 2015
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Re: Which one ? 8mm or 7-14mm

Of the two, I would go for the 7-14 quite simple because it would get more use. Unless you need the pro features, the Samyang 7.5 mm fisheye (which I am getting) seems to be a great option.
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Old 31st May 2015
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Re: Which one ? 8mm or 7-14mm

I've got the Samyang 14 for use on my FF Canon - it has to be one of the sharpest lenses I have.
I totally agree that the 7.5mm m4/3 version would make sense.
Looking forward to seeing your images marty

Mike
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Old 1st June 2015
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Re: Which one ? 8mm or 7-14mm

Quote:
Originally Posted by yorky View Post
is the 8mm a much better lens than the Samsung 7.5???????
No, but it has autofocus, auto aperture and is weather sealed. It is also a lot heavier, however, and the Samyang has a slightly wider angle of view (being a 7.5mm rather than an 8mm) Panasonic also produce an 8mm fisheye lens that is autofocus and auto aperture but without the weather sealing, and is lighter than the new Olympus lens.

I read a review comparing the Panasonic and the Samyang a while ago, and the reviewer was of the opinion that the Samyang was fractionally better optically but the difference was so small as not much to matter. I doubt that the Olympus will be in a different league optically, so it is probably only worth buying over the Panasonic if weather sealing is important, and the Panasonic is only worth buying over the Samyang if autofocus and auto aperture is worth the additional price.

Edit: I forgot to add: one important advantage of the Olympus lens is that, unlike the Samyang and Panasonic lenses, which are f/3.5 maximum aperture, the Olympus is f/1.8, so will be better for low light work and for producing a shallower depth of field, if this is desired. Fisheye lenses are not commonly used either in low light situations or to produce a shallow depth of field, so these advantages are perhaps not as important as with other types of lens, but they may be important to some people.

Last edited by jamespetts; 1st June 2015 at 09:40 PM. Reason: Omission
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