FF TC - full frame teleconverter

fsge · 03-07-2018, 01:06 AM

Originally posted by gaweidert

I know, I know but i am heading to Yellowstone in 2 months. So hop to it Pentax!!!

Come back to Yellowstone in 2 years

Bophoto · 03-07-2018, 02:07 AM

I hope it will be something like F1,7X.
A 1.4X is a bit small in my opinion, think croping. DA300/4 X 1,4 = 420/5,6, DA300/4 X 1,7 = 510/6,7.
Without mechanical auto focus from the camera and with AF switch for AF in the converter or lens.
Hopefully 2020 and not later.

angerdan · 03-07-2018, 02:14 AM

Originally posted by Bophoto

I hope it will be something like F1,7X. Without mechanical auto focus from the camera and with AF switch for AF in the converter or lens.

For modern lenses with fast AF like the D FA* 50mm this isn't a good idea. Also 1.7x decrease the speed of a lens more than 1.4x.

Bophoto · 03-07-2018, 02:49 AM

Originally posted by angerdan

For modern lenses with fast AF like the D FA* 50mm this isn't a good idea.

Why?

Also 1.7x decrease the speed of a lens more than 1.4x.

Not sure if you mean AF or/and f stops.
Of course it gets a litle bit worse with a converter, but with 1.4X you get close to crop an image instead.
But an AF switch is probably unnecessary, it should work automatically.

**clackers** · 03-07-2018, 02:49 AM - **1 Like**

Originally posted by angerdan

For modern lenses with fast AF like the D FA* 50mm this isn't a good idea. Also 1.7x decrease the speed of a lens more than 1.4x.

1.4x seems to do its job with a reasonably small hit to quality.

I've used a couple of 2x and honestly, I was better off cropping.

**gaweidert** · 03-07-2018, 05:21 AM

Originally posted by fsge

Come back to Yellowstone in 2 years

I plan to go there then too.

I'm sort of addicted to the place.

bobell69 · 03-11-2018, 09:33 AM

Since the work has already been done for the teleconverter for the APSC lenses, I imagine the biggest challenge will be in the glass. The electronics in the present one should port over seamlessly with few modifications.

ogl · 03-11-2018, 09:47 AM

It must be 1.4 and 2x TC

**BigMackCam** · 03-11-2018, 09:50 AM

Originally posted by ogl

It must be 1.4 and 2x TC

1.4x yes... but they won't release a 2x converter. There's just too much impact on IQ...

ogl · 03-11-2018, 09:57 AM

Originally posted by BigMackCam

1.4x yes... but they won't release a 2x converter. There's just too much impact on IQ...

They made it in film era. Canon and Sony produce 1.4x and 2x, Nikon produces 1.4x, 1.7x and 2x. The users are happy.

**BigMackCam** · 03-11-2018, 10:15 AM

Originally posted by ogl

They made it in film era. Canon and Sony produce 1.4x and 2x, Nikon produces 1.4x, 1.7x and 2x. The users are happy.

35mm film photography didn't involve pixel peeping 36MP resolution images.

I just don't believe Ricoh will produce a modern 2x converter (it never has for APS-C). 1.4x, yes... 1.7x, maybe. But 2x? I'd be thoroughly amazed.

Take a look at Kurt Munger's review of the Sony 1.4x and 2x TCs and you'll see why. The 1.4x generally produces better sharpness and detail than upscaling of non-TC images. Upscale those 1.4x images, and they're actually better than those taken with the 2x. As such, the 1.4x TC is the one to go for and there's little benefit to owning the 2x... or as Kurt puts it, "it really looks like you'd be just as well off by leaving the 2.0X in the bag".

Kunzite · 03-11-2018, 10:49 AM

The 1.4x RC might work with my D FA 150-450. It would work with the D FA 70-200 f/4, if I ever decide on a lighter (and shorter) alternative.

normhead · 03-11-2018, 11:11 AM

Originally posted by gaweidert

Waiting for one here. Hopefully not two years out. How hard can it be?

With the current focus on surpassing previous resolution expectations "lenses for modern sensors" , I would be expect the new TC to be both more money than the 1.4 and better IQ. I expect a modern TC for modern sensors at a modern price. If they can produce a 2x with say 5% resolution loss, I'd be happy to pay up to $800 for it. It would turn my Tamron 300 2.8 into a 600 ƒ5.6 and as far as I'm concerned, IQ is the only thing I want them to get right. If the IQ isn't right, people will just use whatever old cheaper TC they can get their hands on.

As for the time limit... why do people put themselves through this? In 10 years from now will I care if it's one year, two, or three?

Right now I can use the 300 and 1.7 to get to 510 ƒ4.5... there's nothing particularly important about that extra 90mm.
My guess, if it isn't worth it for you to own the 1.7 and/or 1.4, it definitely won't be worth it for you to buy the new TC, whatever it's designation. New better things always cost more money.

Zygonyx · 03-11-2018, 11:23 AM - **1 Like**

Originally posted by OoKU

Good new，that's what I want！

Me too !

**gaweidert** · 03-11-2018, 03:07 PM - **1 Like**

Originally posted by normhead

With the current focus on surpassing previous resolution expectations "lenses for modern sensors" , I would be expect the new TC to be both more money than the 1.4 and better IQ. I expect a modern TC for modern sensors at a modern price. If they can produce a 2x with say 5% resolution loss, I'd be happy to pay up to $800 for it. It would turn my Tamron 300 2.8 into a 600 ƒ5.6 and as far as I'm concerned, IQ is the only thing I want them to get right. If the IQ isn't right, people will just use whatever old cheaper TC they can get their hands on.

As for the time limit... why do people put themselves through this? In 10 years from now will I care if it's one year, two, or three?

Right now I can use the 300 and 1.7 to get to 510 ƒ4.5... there's nothing particularly important about that extra 90mm.
My guess, if it isn't worth it for you to own the 1.7 and/or 1.4, it definitely won't be worth it for you to buy the new TC, whatever it's designation. New better things always cost more money.

Well, my current Tamron 1.4x TC is starting to get a bit hazy. So I am going to need another one and I am hoping that Pentax comes out with one before I have to retire the Tamron. If I have my usual luck, the Tamron will get retired. I will buy another used one somewhere the week before Pentax announces that theirs is available for sale.

03-11-2018, 09:57 AM	#25
ogl Banned Join Date: Dec 2007 Location: Sankt Peterburg Photos: Gallery \| Albums Posts: 8,382	Originally posted by BigMackCam 1.4x yes... but they won't release a 2x converter. There's just too much impact on IQ... They made it in film era. Canon and Sony produce 1.4x and 2x, Nikon produces 1.4x, 1.7x and 2x. The users are happy. Last edited by ogl; 03-11-2018 at 10:02 AM.

03-11-2018, 10:15 AM	#26
BigMackCam Digitiser of Film Join Date: Mar 2010 Location: North East of England Posts: 20,644	Originally posted by ogl They made it in film era. Canon and Sony produce 1.4x and 2x, Nikon produces 1.4x, 1.7x and 2x. The users are happy. 35mm film photography didn't involve pixel peeping 36MP resolution images. I just don't believe Ricoh will produce a modern 2x converter (it never has for APS-C). 1.4x, yes... 1.7x, maybe. But 2x? I'd be thoroughly amazed. Take a look at Kurt Munger's review of the Sony 1.4x and 2x TCs and you'll see why. The 1.4x generally produces better sharpness and detail than upscaling of non-TC images. Upscale those 1.4x images, and they're actually better than those taken with the 2x. As such, the 1.4x TC is the one to go for and there's little benefit to owning the 2x... or as Kurt puts it, "it really looks like you'd be just as well off by leaving the 2.0X in the bag". Last edited by BigMackCam; 03-11-2018 at 11:07 AM.

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03-07-2018, 01:06 AM	#16
fsge Veteran Member Join Date: Jun 2010 Location: Genf Posts: 1,138	Originally posted by gaweidert I know, I know but i am heading to Yellowstone in 2 months. So hop to it Pentax!!! Come back to Yellowstone in 2 years

03-07-2018, 02:07 AM	#17
Bophoto Veteran Member Join Date: Dec 2006 Location: Sweden Photos: Gallery Posts: 429	I hope it will be something like F1,7X. A 1.4X is a bit small in my opinion, think croping. DA300/4 X 1,4 = 420/5,6, DA300/4 X 1,7 = 510/6,7. Without mechanical auto focus from the camera and with AF switch for AF in the converter or lens. Hopefully 2020 and not later.

03-07-2018, 02:14 AM	#18
angerdan Pentaxian Join Date: Feb 2015 Photos: Gallery \| Albums Posts: 2,639 Original Poster	Originally posted by Bophoto I hope it will be something like F1,7X. Without mechanical auto focus from the camera and with AF switch for AF in the converter or lens. For modern lenses with fast AF like the D FA* 50mm this isn't a good idea. Also 1.7x decrease the speed of a lens more than 1.4x.

03-07-2018, 02:49 AM	#19
Bophoto Veteran Member Join Date: Dec 2006 Location: Sweden Photos: Gallery Posts: 429	Originally posted by angerdan For modern lenses with fast AF like the D FA* 50mm this isn't a good idea. Why? Also 1.7x decrease the speed of a lens more than 1.4x. Not sure if you mean AF or/and f stops. Of course it gets a litle bit worse with a converter, but with 1.4X you get close to crop an image instead. But an AF switch is probably unnecessary, it should work automatically.

03-07-2018, 02:49 AM - 1 Like	#20
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by angerdan For modern lenses with fast AF like the D FA* 50mm this isn't a good idea. Also 1.7x decrease the speed of a lens more than 1.4x. 1.4x seems to do its job with a reasonably small hit to quality. I've used a couple of 2x and honestly, I was better off cropping.

03-07-2018, 05:21 AM	#21
gaweidert Loyal Site Supporter Join Date: Mar 2012 Location: Rochester, NY Photos: Gallery Posts: 5,325	Originally posted by fsge Come back to Yellowstone in 2 years I plan to go there then too. I'm sort of addicted to the place.

03-11-2018, 09:33 AM	#22
bobell69 Veteran Member Join Date: Sep 2007 Location: Courtenay BC Photos: Gallery \| Albums Posts: 498	Since the work has already been done for the teleconverter for the APSC lenses, I imagine the biggest challenge will be in the glass. The electronics in the present one should port over seamlessly with few modifications.

03-11-2018, 09:47 AM	#23
ogl Banned Join Date: Dec 2007 Location: Sankt Peterburg Photos: Gallery \| Albums Posts: 8,382	It must be 1.4 and 2x TC

03-11-2018, 09:50 AM	#24
BigMackCam Digitiser of Film Join Date: Mar 2010 Location: North East of England Posts: 20,644	Originally posted by ogl It must be 1.4 and 2x TC 1.4x yes... but they won't release a 2x converter. There's just too much impact on IQ...

03-11-2018, 10:49 AM	#27
Kunzite Pentaxian Join Date: Apr 2007 Location: Romania Posts: 15,132	The 1.4x RC might work with my D FA 150-450. It would work with the D FA 70-200 f/4, if I ever decide on a lighter (and shorter) alternative.

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03-11-2018, 11:11 AM	#28
normhead Pentaxian Join Date: Jun 2007 Location: Near Algonquin Park Photos: Gallery \| Albums Posts: 40,448	Originally posted by gaweidert Waiting for one here. Hopefully not two years out. How hard can it be? With the current focus on surpassing previous resolution expectations "lenses for modern sensors" , I would be expect the new TC to be both more money than the 1.4 and better IQ. I expect a modern TC for modern sensors at a modern price. If they can produce a 2x with say 5% resolution loss, I'd be happy to pay up to $800 for it. It would turn my Tamron 300 2.8 into a 600 ƒ5.6 and as far as I'm concerned, IQ is the only thing I want them to get right. If the IQ isn't right, people will just use whatever old cheaper TC they can get their hands on. As for the time limit... why do people put themselves through this? In 10 years from now will I care if it's one year, two, or three? Right now I can use the 300 and 1.7 to get to 510 ƒ4.5... there's nothing particularly important about that extra 90mm. My guess, if it isn't worth it for you to own the 1.7 and/or 1.4, it definitely won't be worth it for you to buy the new TC, whatever it's designation. New better things always cost more money.

03-11-2018, 11:23 AM - 1 Like	#29
Zygonyx Pentaxian Join Date: Jun 2011 Location: Ile de France Posts: 4,032	Originally posted by OoKU Good new，that's what I want！ Me too !

03-11-2018, 03:07 PM - 1 Like	#30
gaweidert Loyal Site Supporter Join Date: Mar 2012 Location: Rochester, NY Photos: Gallery Posts: 5,325	Originally posted by normhead With the current focus on surpassing previous resolution expectations "lenses for modern sensors" , I would be expect the new TC to be both more money than the 1.4 and better IQ. I expect a modern TC for modern sensors at a modern price. If they can produce a 2x with say 5% resolution loss, I'd be happy to pay up to $800 for it. It would turn my Tamron 300 2.8 into a 600 ƒ5.6 and as far as I'm concerned, IQ is the only thing I want them to get right. If the IQ isn't right, people will just use whatever old cheaper TC they can get their hands on. As for the time limit... why do people put themselves through this? In 10 years from now will I care if it's one year, two, or three? Right now I can use the 300 and 1.7 to get to 510 ƒ4.5... there's nothing particularly important about that extra 90mm. My guess, if it isn't worth it for you to own the 1.7 and/or 1.4, it definitely won't be worth it for you to buy the new TC, whatever it's designation. New better things always cost more money. Well, my current Tamron 1.4x TC is starting to get a bit hazy. So I am going to need another one and I am hoping that Pentax comes out with one before I have to retire the Tamron. If I have my usual luck, the Tamron will get retired. I will buy another used one somewhere the week before Pentax announces that theirs is available for sale.