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05-16-2010, 03:29 PM   #1
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New High Ratio Zoom

Would you be happy with a High-zoom ratio Zoom 30-350mm F5.6 20 elements in 5 groups for APS-C ?

United States Patent Application: 0100033838

05-16-2010, 03:46 PM   #2
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Yes Please

an equivalent 45-525mm at F5.6.......Tasty!!!
05-16-2010, 03:49 PM   #3
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QuoteOriginally posted by RuiC Quote
Would you be happy with a High-zoom ratio Zoom 30-350mm F5.6 20 elements in 5 groups for APS-C ?

United States Patent Application: 0100033838
It's an intersting design. I hope they build it. If they can produce it with a good quality I would think it would find acceptance. A 1 lens solution has a place.

I"ve often found myself using a fairly high ratio zoom even though I have plenty of primes for logistical reasons.
05-16-2010, 04:07 PM   #4
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Thank you for this very interesting Patent.
But why do you say "for APS-C"? The only mention about APS-C is about the equivalent range starting at 45mm.
I guess it could also be the "new" 18-250mm equivalent for a FF camera!

05-16-2010, 05:04 PM   #5
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QuoteOriginally posted by youky63 Quote
I guess it could also be the "new" 18-250mm equivalent for a FF camera!
Doesn't look like. 350mm, 13x points to 27mm and 60 points to 30mm image diagonal (APSC).

I must say that I find the 18-250mm range much mire appealing than the 28-350mm range. A superzoom really should cover the wide angle part as well. That's more like the 50-500 Bigma for APSC
05-16-2010, 05:45 PM   #6
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QuoteOriginally posted by falconeye Quote
Doesn't look like. 350mm, 13x points to 27mm and 60 points to 30mm image diagonal (APSC).

I must say that I find the 18-250mm range much mire appealing than the 28-350mm range. A superzoom really should cover the wide angle part as well. That's more like the 50-500 Bigma for APSC
That's why I think it could be the replacement of the 18-250mm (APS-C, so equivalent 27.5-380mm) but for a FF sensor.
30mm is a very strange "wide" angle for APS-C, and 350mm is not much longer than the very appreciated 50-300mm. So I don't the point for such a lens on crop sensors.
But maybe I just hope to much to find good signs about a FF body...
05-16-2010, 06:04 PM   #7
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I didn't see the sensor size in the patent application but I guess I could have missed it.

Could this be a new zoom for the 645d system?
05-16-2010, 06:09 PM   #8
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With a 1.2 million patent office backlog, it may be a while before this lens comes close to being produced

05-16-2010, 06:16 PM   #9
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QuoteOriginally posted by ivoire Quote
With a 1.2 million patent office backlog, it may be a while before this lens comes close to being produced
Not really. It can be produced with Patent Pending or provisional status.
05-16-2010, 06:33 PM   #10
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QuoteOriginally posted by Blue Quote
Could this be a new zoom for the 645d system?

if so this lens would probably be a fixed f/8 or it would be a MASSIVE chunk of glass
05-16-2010, 06:35 PM   #11
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QuoteOriginally posted by Digitalis Quote
if so this lens would probably be a fixed f/8 or it would be a MASSIVE chunk of glass
f5.6 doesn't make much sense for 30mm on aps-c or 24x36.

Edit: What sensor has an AOV of 60 degrees at ~ 30mm focal length?
05-16-2010, 06:51 PM   #12
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QuoteOriginally posted by Blue Quote
f5.6 doesn't make much sense for 30mm on aps-c or 24x36.

Edit: What sensor has an AOV of 60 degrees at ~ 30mm focal length?
The f/5.6 mention is related to the 350mm end. But there is no mention about the aperture for wide angle.

And about the AOV of 60 degrees at 30mm, I would say... all of them! Since the angle of view in not dependant of the sensor but the lens (this 30mm on FF is a 45mm equivalent on APS-C. )
05-16-2010, 06:55 PM   #13
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QuoteOriginally posted by youky63 Quote
The f/5.6 mention is related to the 350mm end. But there is no mention about the aperture for wide angle.

And about the AOV of 60 degrees at 30mm, I would say... all of them! Since the angle of view in not dependant of the sensor but the lens (this 30mm on FF is a 45mm equivalent on APS-C. )
The patent states:

QuoteQuote:
[0013](iii) an F-number of 5.6; and
[0014](iv) an angle-of-view of approximately 60.degree. at the short focal length extremity.
actually the sensor size will determine the AOV & FOV. A 30mm lens is a 30mm lens. Why do you think the AOV changes when you take FA 50mm f1.4 lens off of a film camera and put it on a K20d?

Last edited by Blue; 05-16-2010 at 07:04 PM.
05-16-2010, 07:02 PM   #14
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QuoteOriginally posted by Blue Quote
The patent states:



actually the sensor size will determine the AOV & FOV. A 30mm lens is a 30mm lens. Why do you think the AOV changes when you take FA 50mm f1.4 lens off of a film camera and put it on a K20d?
Maybe because when you use it on a K20D it becomes a 75mm equivalent... But still the lens can see with a 50mm AOV, just your (my) camera is a bit blind on the borders. ;-P
05-16-2010, 07:06 PM   #15
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QuoteOriginally posted by youky63 Quote
Maybe because when you use it on a K20D it becomes a 75mm equivalent... But still the lens can see with a 50mm AOV, just your (my) camera is a bit blind on the borders. ;-P
What do you think I said? It changes because the dimensions of the aps-c sensor is smaller than the dimensions of the 135 film format.
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