Lens specifications of the A1 lens in 35mm terms at DVinfo.net

Shiv Kumar · October 25th, 2007, 02:49 PM

I'm wondering what the focal legth range is of the A1 lens in terms of 35mm. Also when I see an f stop of 1.6 is this truely 1.6 or something else really?

I'd appreciate some technical (formulas) explantion if possible rather than just numbers :)

Thanks.

Shiv.

Juni Zhao · October 25th, 2007, 03:41 PM

I think the lens is 25mm-650mm zoom

Bill Pryor · October 25th, 2007, 04:06 PM

It's about 31.5 mm on the wide end, which would be about 630 on the long end. I wish it did go to 25mm!

My guess is the f-stops are more like t-stops, but I don't know.

Roger Lee · October 25th, 2007, 10:38 PM

From Canon's website on the A-1

Focal Length: 4.5mm - 90mm (32.5mm - 650mm; 35mm photo equivalent)

Max. F/Stop: f/1.6 -- 35mm

Petri Kaipiainen · October 25th, 2007, 11:16 PM

When you zoom in the f-stop drops to f/3.6 or something.

Chris Hurd · October 25th, 2007, 11:38 PM

For Shiv, please see my Canon XH A1 Frequently Asked Questions page at http://www.dvinfo.net/canonxh/xhfaq.php -- thanks in advance,

Shiv Kumar · October 26th, 2007, 02:11 AM

Thank you all for your replies. It is much appreciated.

Chris, I did look at the FAQ before asking. I guess I was looking for a question similar to the one I asked :)

Shiv.

Chris Hurd · October 26th, 2007, 05:51 AM

Focal length and maximum aperture values are both explained on that page.

Shiv Kumar · October 26th, 2007, 06:03 AM

Yes they are. What I meant to say is that I was looking for a specific question and didn't find one that I thought would have an answer for me. I wasn't looking at the answers, just the questions.

Shiv.

Bill Pryor · October 26th, 2007, 08:15 AM

Oops I missed it by a mm. 32.5, not 31.5. I find that to be wide enough for just about everything I do. So far I haven't had a need for a wide angle adapter and from past experience with an 8.5mm on a 2/3" chip camera, I doubt I'll need one. The same thing is not true for the XL series standard lenses. In shooting with a friend's XL2, I had the wide angle adapter on more than off. If I got the XL H1 I'd have to also get the wide angle lens.

Don Palomaki · October 26th, 2007, 10:47 AM

Just keep in mind that the 35mm equivalent focal lengths are based on field of view, and are approximate. The aspect ratio of a standard 35mm film frame is ~3:2 while the camcorder does 16:9 or 4:3.

Shiv Kumar · October 26th, 2007, 01:43 PM

Don,

Right, I did forget to take that into account. So is the FOV of a 16:9 considered more than 3:2?

John M. Graham · October 26th, 2007, 05:29 PM

Wish there was a 32.5 - 650 mm "L" lens for D-SLRs!

Even Solberg · October 26th, 2007, 06:01 PM

Sigma has a 50-500. That's probably as close as you can get.

Don Palomaki · October 27th, 2007, 07:03 PM

3:2 would correspond to 13.5:9
4:3 would correspond to 12:9

October 25th, 2007, 02:49 PM	#1
Shiv Kumar Major Player Join Date: Jul 2007 Location: Gainesville, VA, USA Posts: 327	Lens specifications of the A1 lens in 35mm terms I'm wondering what the focal legth range is of the A1 lens in terms of 35mm. Also when I see an f stop of 1.6 is this truely 1.6 or something else really? I'd appreciate some technical (formulas) explantion if possible rather than just numbers :) Thanks. Shiv.

October 25th, 2007, 11:38 PM	#6
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,368 Images: 513	For Shiv, please see my Canon XH A1 Frequently Asked Questions page at http://www.dvinfo.net/canonxh/xhfaq.php -- thanks in advance, __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!

October 26th, 2007, 05:51 AM	#8
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,368 Images: 513	Focal length and maximum aperture values are both explained on that page. __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!

October 26th, 2007, 10:47 AM	#11
Don Palomaki Wrangler Join Date: Sep 2001 Location: Northern VA Posts: 4,489	Just keep in mind that the 35mm equivalent focal lengths are based on field of view, and are approximate. The aspect ratio of a standard 35mm film frame is ~3:2 while the camcorder does 16:9 or 4:3. __________________ dpalomaki@dspalomaki.com

October 26th, 2007, 06:01 PM	#14
Even Solberg Regular Crew Join Date: Sep 2006 Location: Oslo, Norway Posts: 106	Sigma has a 50-500. That's probably as close as you can get. __________________ "Those who dream by day are cognizant of many things which escape those who dream only by night." -- Edgar Allan Poe

October 25th, 2007, 03:41 PM	#2
Juni Zhao Regular Crew Join Date: May 2007 Location: North Andover, Ma Posts: 102	I think the lens is 25mm-650mm zoom

October 25th, 2007, 04:06 PM	#3
Bill Pryor Contributor Join Date: Jan 2003 Location: Kansas City, MO Posts: 4,449	It's about 31.5 mm on the wide end, which would be about 630 on the long end. I wish it did go to 25mm! My guess is the f-stops are more like t-stops, but I don't know.

October 25th, 2007, 10:38 PM	#4
Roger Lee Major Player Join Date: Sep 2007 Location: Western Minnesota Posts: 227	From Canon's website on the A-1 Focal Length: 4.5mm - 90mm (32.5mm - 650mm; 35mm photo equivalent) Max. F/Stop: f/1.6 -- 35mm

October 25th, 2007, 11:16 PM	#5
Petri Kaipiainen Major Player Join Date: Apr 2007 Location: Espoo Finland Posts: 380	When you zoom in the f-stop drops to f/3.6 or something.

October 26th, 2007, 02:11 AM	#7
Shiv Kumar Major Player Join Date: Jul 2007 Location: Gainesville, VA, USA Posts: 327	Thank you all for your replies. It is much appreciated. Chris, I did look at the FAQ before asking. I guess I was looking for a question similar to the one I asked :) Shiv.

October 26th, 2007, 06:03 AM	#9
Shiv Kumar Major Player Join Date: Jul 2007 Location: Gainesville, VA, USA Posts: 327	Yes they are. What I meant to say is that I was looking for a specific question and didn't find one that I thought would have an answer for me. I wasn't looking at the answers, just the questions. Shiv.

October 26th, 2007, 08:15 AM	#10
Bill Pryor Contributor Join Date: Jan 2003 Location: Kansas City, MO Posts: 4,449	Oops I missed it by a mm. 32.5, not 31.5. I find that to be wide enough for just about everything I do. So far I haven't had a need for a wide angle adapter and from past experience with an 8.5mm on a 2/3" chip camera, I doubt I'll need one. The same thing is not true for the XL series standard lenses. In shooting with a friend's XL2, I had the wide angle adapter on more than off. If I got the XL H1 I'd have to also get the wide angle lens.

October 26th, 2007, 01:43 PM	#12
Shiv Kumar Major Player Join Date: Jul 2007 Location: Gainesville, VA, USA Posts: 327	Don, Right, I did forget to take that into account. So is the FOV of a 16:9 considered more than 3:2?

October 26th, 2007, 05:29 PM	#13
John M. Graham Regular Crew Join Date: Oct 2006 Location: Fort Worth, Texas Posts: 83	Wish there was a 32.5 - 650 mm "L" lens for D-SLRs!

October 27th, 2007, 07:03 PM	#15
Don Palomaki Wrangler Join Date: Sep 2001 Location: Northern VA Posts: 4,489	3:2 would correspond to 13.5:9 4:3 would correspond to 12:9 __________________ dpalomaki@dspalomaki.com