Widest APSC rectilinear lens yet -Samyang 10mm - Images Added

cali92rs · 09-15-2012, 01:12 PM

I wonder why they opted for a f2.8 instead of a f4 with this lens. Yes you lose a stop, but really who would want to use a lens this wide at f2.8?? I would trade the extra stop for a smaller package. But yes this is very intriguing, a lens that pentax should've done a while ago.

**WPRESTO** · 09-15-2012, 02:01 PM

The only 8mm (sometimes called 7mm) I know of is sold under Bower, Rokunar, Samyang, or Vivitar brands and is a fish-eye, not rectilinear. The Pentax zoom that goes to 10mm is also a fish eye at that focal length, so does not qualify as an alternative to the Samyang 10mm, but both the 10-20 and 8-16 Sigma zooms are near rectilinear, allowing the barrel distortion at the wide end.

Na Horuk · 09-15-2012, 02:10 PM

There is also an 8mm Peleng lens that works for Pentax, but it is also a fisheye.
Why 2.8 instead of 4.0? Well, it could be useful in some situations, wide angles are not only used for bright sunny landscapes after all. Also, most lenses are not great wide open and this would mean at f4, the lens should control its aberrations well.

**WPRESTO** · 09-15-2012, 02:20 PM

Originally posted by Na Horuk

There is also an 8mm Peleng lens that works for Pentax, but it is also a fisheye.
Why 2.8 instead of 4.0? Well, it could be useful in some situations, wide angles are not only used for bright sunny landscapes after all. Also, most lenses are not great wide open and this would mean at f4, the lens should control its aberrations well.

I wonder if the Peleng is also the same lens as the Bower-Rokunar etc. I've never heard of the Peleng brand.

Transit · 09-15-2012, 02:23 PM

Originally posted by 24X36NOW

Widest rectilinear PRIME lens. The widest APS-C rectilinear wide angle is still the Sigma 8-16.

+1

Heck that front element looks vulnerable, at least the sigma keeps the hood mounted

Blue · 09-15-2012, 02:43 PM

Originally posted by WPRESTO

I wonder if the Peleng is also the same lens as the Bower-Rokunar etc. I've never heard of the Peleng brand.

Peleng was Belorusian and the company was Belomo. The 8mm is a circular FE. It projects a 24mm circle on a 24x36mm frame.

Home - Peleng 8mm f/3.5 Circular Fisheye Lens for Canon, Nikon, Olympus

ihasa · 09-15-2012, 02:53 PM

Originally posted by cali92rs

I wonder why they opted for a f2.8 instead of a f4 with this lens. Yes you lose a stop, but really who would want to use a lens this wide at f2.8?? I would trade the extra stop for a smaller package. But yes this is very intriguing, a lens that pentax should've done a while ago.

+1 on all fronts.

Docrwm · 09-15-2012, 03:38 PM

Originally posted by cali92rs

I wonder why they opted for a f2.8 instead of a f4 with this lens. Yes you lose a stop, but really who would want to use a lens this wide at f2.8?? I would trade the extra stop for a smaller package. But yes this is very intriguing, a lens that pentax should've done a while ago.

Low light shots. People do take cityscapes for example at night.

Originally posted by WPRESTO

I wonder if the Peleng is also the same lens as the Bower-Rokunar etc. I've never heard of the Peleng brand.

No, Peleng is Russian and is completely different in it's optics from the Samyang.

lytrytyr · 09-15-2012, 03:57 PM

Originally posted by Docrwm

Peleng is Russian.

It's from Belarus.

See

About www.Peleng8.com | buy it now - Peleng 8mm f/3.5 Circular Fisheye Lens for Canon, Nikon, Olympus

lytrytyr · 09-15-2012, 04:02 PM

Originally posted by cali92rs

I wonder why they opted for a f2.8 instead of a f4 with this lens.

In addition to the reason Doc mentioned, see post #13.

Diffraction may be starting to degrade the image at f/4,
like it does with the 8.5/1.9 on the Q
according to Photozone's tests:

Pentax-01 Standard Prime 8.5mm f/1.9 (Pentax Q) - Review / Lens Test - Analysis

cali92rs · 09-15-2012, 04:13 PM

Originally posted by lytrytyr

In addition to the reason Doc mentioned, see post #13.

Diffraction may be starting to degrade the image at f/4,
like it does with the 8.5/1.9 on the Q
according to Photozone's tests:

Pentax-01 Standard Prime 8.5mm f/1.9 (Pentax Q) - Review / Lens Test - Analysis

You cant compare a Q lens to one designed for much larger format...the larger the format, the larger the f number it will begin to show the effects of diffraction. No lens designed for APS -C is going to show diffraction at f4 beyond a very negligible amount

cali92rs · 09-15-2012, 04:16 PM

Originally posted by Docrwm

Low light shots. People do take cityscapes for example at night

Yea, you could, although I would still prefer the smaller package. Personally, if I was doing a night city scape it would be at f8 and on a tripod.

lytrytyr · 09-15-2012, 06:19 PM

Originally posted by cali92rs

You cant compare a Q lens to one designed for much larger format...the larger the format, the larger the f number it will begin to show the effects of diffraction.

You could compare the Q 8.5/1.9 and the Samyang 10/2.8 adapted to the Q.
Diffraction effects ultimately depend on the size of the aperture blades' opening.
What you are describing is more a function of different "equivalent" focal lengths,
and different enlargement ratios for a given print size.

Originally posted by cali92rs

No lens designed for APS -C is going to show diffraction at f4 beyond a very negligible amount

Look at the Photozone test of the Sigma 8-16 at 8mm:
Sigma AF 8-16mm f/4.5-5.6 DC HSM (DX) - Review / Lab Test Report - Analysis
Diffraction is already degrading the central image noticeably between f/4.5 and f/5.6,
from 2850 to 2675 lw/ph on APS-C (16MP).

lytrytyr · 09-15-2012, 06:36 PM

Originally posted by cali92rs

No lens designed for APS -C . . .

Interestingly enough, the Polish site
Samyang 10 mm 1:2.8 ED AS UMC CS - Optyczne.pl
mentions the Samyang 10/2.8 as becoming available for "Cztery Trzecie," Four Thirds.
I don't know how reliable their information is,
although Samyang does have a base in Poland.

VoiceOfReason · 09-15-2012, 09:23 PM

I'll stick with my Tamron 10-24. I like autofocus.

09-15-2012, 02:43 PM	#21
Blue Moderator Site Supporter Join Date: Jun 2008 Location: Florida Hill Country Photos: Gallery \| Albums Posts: 17,377	Originally posted by WPRESTO I wonder if the Peleng is also the same lens as the Bower-Rokunar etc. I've never heard of the Peleng brand. Peleng was Belorusian and the company was Belomo. The 8mm is a circular FE. It projects a 24mm circle on a 24x36mm frame. Home - Peleng 8mm f/3.5 Circular Fisheye Lens for Canon, Nikon, Olympus Last edited by Blue; 09-15-2012 at 07:18 PM.

09-15-2012, 03:38 PM	#23
Docrwm Veteran Member Join Date: Sep 2010 Location: Somewhere in the Southern US Photos: Gallery \| Albums Posts: 12,285 Original Poster	Originally posted by cali92rs I wonder why they opted for a f2.8 instead of a f4 with this lens. Yes you lose a stop, but really who would want to use a lens this wide at f2.8?? I would trade the extra stop for a smaller package. But yes this is very intriguing, a lens that pentax should've done a while ago. Low light shots. People do take cityscapes for example at night. Originally posted by WPRESTO I wonder if the Peleng is also the same lens as the Bower-Rokunar etc. I've never heard of the Peleng brand. No, Peleng is Russian and is completely different in it's optics from the Samyang. Last edited by Blue; 09-15-2012 at 07:18 PM.

09-15-2012, 06:19 PM	#28
lytrytyr Pentaxian Join Date: Nov 2011 Photos: Gallery \| Albums Posts: 4,310	Originally posted by cali92rs You cant compare a Q lens to one designed for much larger format...the larger the format, the larger the f number it will begin to show the effects of diffraction. You could compare the Q 8.5/1.9 and the Samyang 10/2.8 adapted to the Q. Diffraction effects ultimately depend on the size of the aperture blades' opening. What you are describing is more a function of different "equivalent" focal lengths, and different enlargement ratios for a given print size. Originally posted by cali92rs No lens designed for APS -C is going to show diffraction at f4 beyond a very negligible amount Look at the Photozone test of the Sigma 8-16 at 8mm: Sigma AF 8-16mm f/4.5-5.6 DC HSM (DX) - Review / Lab Test Report - Analysis Diffraction is already degrading the central image noticeably between f/4.5 and f/5.6, from 2850 to 2675 lw/ph on APS-C (16MP). Last edited by lytrytyr; 09-15-2012 at 06:25 PM.

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09-15-2012, 01:12 PM	#16
cali92rs Veteran Member Join Date: May 2011 Location: Long Beach, CA Posts: 3,354	I wonder why they opted for a f2.8 instead of a f4 with this lens. Yes you lose a stop, but really who would want to use a lens this wide at f2.8?? I would trade the extra stop for a smaller package. But yes this is very intriguing, a lens that pentax should've done a while ago.

09-15-2012, 02:01 PM	#17
WPRESTO Loyal Site Supporter Join Date: Aug 2010 Location: Massachusetts Photos: Gallery \| Albums Posts: 59,108	The only 8mm (sometimes called 7mm) I know of is sold under Bower, Rokunar, Samyang, or Vivitar brands and is a fish-eye, not rectilinear. The Pentax zoom that goes to 10mm is also a fish eye at that focal length, so does not qualify as an alternative to the Samyang 10mm, but both the 10-20 and 8-16 Sigma zooms are near rectilinear, allowing the barrel distortion at the wide end.

09-15-2012, 02:10 PM	#18
Na Horuk Veteran Member Join Date: Feb 2012 Location: Slovenia, probably Photos: Gallery \| Albums Posts: 11,186	There is also an 8mm Peleng lens that works for Pentax, but it is also a fisheye. Why 2.8 instead of 4.0? Well, it could be useful in some situations, wide angles are not only used for bright sunny landscapes after all. Also, most lenses are not great wide open and this would mean at f4, the lens should control its aberrations well.

09-15-2012, 02:20 PM	#19
WPRESTO Loyal Site Supporter Join Date: Aug 2010 Location: Massachusetts Photos: Gallery \| Albums Posts: 59,108	Originally posted by Na Horuk There is also an 8mm Peleng lens that works for Pentax, but it is also a fisheye. Why 2.8 instead of 4.0? Well, it could be useful in some situations, wide angles are not only used for bright sunny landscapes after all. Also, most lenses are not great wide open and this would mean at f4, the lens should control its aberrations well. I wonder if the Peleng is also the same lens as the Bower-Rokunar etc. I've never heard of the Peleng brand.

09-15-2012, 02:23 PM	#20
Transit Pentaxian Join Date: Aug 2007 Location: Whanganui NZ Photos: Gallery \| Albums Posts: 4,624	Originally posted by 24X36NOW Widest rectilinear PRIME lens. The widest APS-C rectilinear wide angle is still the Sigma 8-16. +1 Heck that front element looks vulnerable, at least the sigma keeps the hood mounted

09-15-2012, 02:53 PM	#22
ihasa Veteran Member Join Date: Jul 2009 Location: West Midlands Photos: Gallery Posts: 2,066	Originally posted by cali92rs I wonder why they opted for a f2.8 instead of a f4 with this lens. Yes you lose a stop, but really who would want to use a lens this wide at f2.8?? I would trade the extra stop for a smaller package. But yes this is very intriguing, a lens that pentax should've done a while ago. +1 on all fronts.

09-15-2012, 03:57 PM	#24
lytrytyr Pentaxian Join Date: Nov 2011 Photos: Gallery \| Albums Posts: 4,310	Originally posted by Docrwm Peleng is Russian. It's from Belarus. See About www.Peleng8.com \| buy it now - Peleng 8mm f/3.5 Circular Fisheye Lens for Canon, Nikon, Olympus

09-15-2012, 04:02 PM	#25
lytrytyr Pentaxian Join Date: Nov 2011 Photos: Gallery \| Albums Posts: 4,310	Originally posted by cali92rs I wonder why they opted for a f2.8 instead of a f4 with this lens. In addition to the reason Doc mentioned, see post #13. Diffraction may be starting to degrade the image at f/4, like it does with the 8.5/1.9 on the Q according to Photozone's tests: Pentax-01 Standard Prime 8.5mm f/1.9 (Pentax Q) - Review / Lens Test - Analysis

09-15-2012, 04:13 PM	#26
cali92rs Veteran Member Join Date: May 2011 Location: Long Beach, CA Posts: 3,354	Originally posted by lytrytyr In addition to the reason Doc mentioned, see post #13. Diffraction may be starting to degrade the image at f/4, like it does with the 8.5/1.9 on the Q according to Photozone's tests: Pentax-01 Standard Prime 8.5mm f/1.9 (Pentax Q) - Review / Lens Test - Analysis You cant compare a Q lens to one designed for much larger format...the larger the format, the larger the f number it will begin to show the effects of diffraction. No lens designed for APS -C is going to show diffraction at f4 beyond a very negligible amount

09-15-2012, 04:16 PM	#27
cali92rs Veteran Member Join Date: May 2011 Location: Long Beach, CA Posts: 3,354	Originally posted by Docrwm Low light shots. People do take cityscapes for example at night Yea, you could, although I would still prefer the smaller package. Personally, if I was doing a night city scape it would be at f8 and on a tripod.

09-15-2012, 06:36 PM	#29
lytrytyr Pentaxian Join Date: Nov 2011 Photos: Gallery \| Albums Posts: 4,310	Originally posted by cali92rs No lens designed for APS -C . . . Interestingly enough, the Polish site Samyang 10 mm 1:2.8 ED AS UMC CS - Optyczne.pl mentions the Samyang 10/2.8 as becoming available for "Cztery Trzecie," Four Thirds. I don't know how reliable their information is, although Samyang does have a base in Poland.

09-15-2012, 09:23 PM	#30
VoiceOfReason Site Supporter Join Date: Jun 2010 Location: Mishawaka IN area Photos: Albums Posts: 6,124	I'll stick with my Tamron 10-24. I like autofocus.