FF TC - full frame teleconverter

ecostigny · 10-18-2019, 08:53 PM

As MikeyBugs95 says, SR is optimized for handheld shooting. When my camera is on a tripod, the SR is off, the self-timer is on, and the mirror lockup is on. This setup works well for my lunar shots (even if the 55-300 zoom isn't the sharpest performer at maximum magnification).

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weverka · 10-21-2019, 08:03 AM

Here is the SMC Pentax-F 1.7x AF Adapter on a Perkin-Elmer 600mm/f8 Solid Cat. 12 second delay, 1/40 second, iso400

y0chang · 10-21-2019, 10:26 AM

I do wish that you could input the focal length manually into SR as an override. That would solve the 3rd party converter issue but Pentax is not going to support a 3rd party TC specially considering ones that haven't been released in ages.

deus ursus · 10-21-2019, 01:18 PM

Originally posted by y0chang

I do wish that you could input the focal length manually into SR as an override. That would solve the 3rd party converter issue but Pentax is not going to support a 3rd party TC specially considering ones that haven't been released in ages.

You can't? If I put a manual lens (K, M or A) on my K-5IIs, the camera prompts me to dial in the focal length. The same if I mount a TC.

**Erictator** · 10-21-2019, 01:26 PM

Originally posted by deus ursus

You can't? If I put a manual lens (K, M or A) on my K-5IIs, the camera prompts me to dial in the focal length. The same if I mount a TC.

I think the issue is with some of the more modern AF TC's, some kindly pass through the lens info for your exif... but don't multiply the value for your SR to work with. I don't have a list of which ones do what, but that is my understanding of the situation.
Eric

y0chang · 10-21-2019, 01:27 PM

Originally posted by deus ursus

You can't? If I put a manual lens (K, M or A) on my K-5IIs, the camera prompts me to dial in the focal length. The same if I mount a TC.

That only works when its a manual lens, it doesn't work with AF lenses. We are basically stuck until a FF TC comes out that accurately reports the 1.5x focal length on say the DA 300mm or if i had money, the 150-450mm.

deus ursus · 10-21-2019, 01:35 PM

Originally posted by Erictator

I think the issue is with some of the more modern AF TC's, some kindly pass through the lens info for your exif... but don't multiply the value for your SR to work with. I don't have a list of which ones do what, but that is my understanding of the situation.
Eric

I see. Now, that's a disadvantage.

ecostigny · 10-21-2019, 07:58 PM

Originally posted by y0chang

That only works when its a manual lens, it doesn't work with AF lenses. We are basically stuck until a FF TC comes out that accurately reports the 1.5x focal length on say the DA 300mm or if i had money, the 150-450mm.

That would explain why my old manual focus glass produces the prompt; I got it with my Pentax-M SMC 50mm f/1.4 this past Saturday.

thibs · 10-21-2019, 10:10 PM

Indeed. The DA converter 1.4x does the math but... It's a DA and doesnt cover FF as you probably all know.

M.B.Yates · 10-21-2019, 10:21 PM

cant wait for the NEW FF teleconverter to pair up with the DFA 150-450

Mistral75 · 10-22-2019, 01:25 AM

Originally posted by M.B.Yates

cant wait for the NEW FF teleconverter to pair up with the DFA 150-450

Even if you can't, I'm afraid you'll have to...

gazonk · 10-22-2019, 01:33 AM - **1 Like**

I bought a Soligor 2x teleconverter when I was a teenager. It’s the most useless piece of photography equipment I own, and it has made me a life time sceptic of teleconverters.

**Erictator** · 10-22-2019, 12:25 PM

Originally posted by gazonk

I bought a Soligor 2x teleconverter when I was a teenager. It’s the most useless piece of photography equipment I own, and it has made me a life time sceptic of teleconverters.

Some of the thinner ones make dandy extension tubes after you knock the coke bottle bottom glass out of the middle.

Eric

ecostigny · 10-22-2019, 07:49 PM

I had a Kiron teleconverter back in the 1980s that I paired with my Vivitar Series 1 70-210mm f/2.8-4. It worked OK, but I didn't use that combination much because what teleconverters magnify best is camera shake.

I did try that pair a few years back with my K-5 to photograph the moon. Forget chromatic aberration manifesting as purple or green fringing--this was bright blue! I've been avoiding using teleconverters with high-contrast subjects ever since.

gazonk · 10-23-2019, 12:42 AM

Originally posted by Erictator

Some of the thinner ones make dandy extension tubes after you knock the coke bottle bottom glass out of the middle.

Eric

LOL! But I have a nice old set of Vivitar extension tubes which work well with old lenses

(It has been a while since I used them myself, but my son have used them with his M-50mm/4 macro to get some creepy spider baby shots!)

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10-21-2019, 10:26 AM	#228
y0chang Veteran Member Join Date: Jan 2012 Location: United States Posts: 793	I do wish that you could input the focal length manually into SR as an override. That would solve the 3rd party converter issue but Pentax is not going to support a 3rd party TC specially considering ones that haven't been released in ages.

10-21-2019, 01:18 PM	#229
deus ursus Pentaxian Join Date: Nov 2012 Location: Stårheim, Norway Posts: 658	Originally posted by y0chang I do wish that you could input the focal length manually into SR as an override. That would solve the 3rd party converter issue but Pentax is not going to support a 3rd party TC specially considering ones that haven't been released in ages. You can't? If I put a manual lens (K, M or A) on my K-5IIs, the camera prompts me to dial in the focal length. The same if I mount a TC.

10-21-2019, 01:26 PM	#230
Erictator Site Supporter Join Date: Jul 2011 Photos: Gallery \| Albums Posts: 3,344	Originally posted by deus ursus You can't? If I put a manual lens (K, M or A) on my K-5IIs, the camera prompts me to dial in the focal length. The same if I mount a TC. I think the issue is with some of the more modern AF TC's, some kindly pass through the lens info for your exif... but don't multiply the value for your SR to work with. I don't have a list of which ones do what, but that is my understanding of the situation. Eric

10-21-2019, 01:27 PM	#231
y0chang Veteran Member Join Date: Jan 2012 Location: United States Posts: 793	Originally posted by deus ursus You can't? If I put a manual lens (K, M or A) on my K-5IIs, the camera prompts me to dial in the focal length. The same if I mount a TC. That only works when its a manual lens, it doesn't work with AF lenses. We are basically stuck until a FF TC comes out that accurately reports the 1.5x focal length on say the DA 300mm or if i had money, the 150-450mm.

10-21-2019, 01:35 PM	#232
deus ursus Pentaxian Join Date: Nov 2012 Location: Stårheim, Norway Posts: 658	Originally posted by Erictator I think the issue is with some of the more modern AF TC's, some kindly pass through the lens info for your exif... but don't multiply the value for your SR to work with. I don't have a list of which ones do what, but that is my understanding of the situation. Eric I see. Now, that's a disadvantage.

10-21-2019, 07:58 PM	#233
ecostigny Pentaxian Join Date: Nov 2017 Location: Branford, CT Posts: 561	Originally posted by y0chang That only works when its a manual lens, it doesn't work with AF lenses. We are basically stuck until a FF TC comes out that accurately reports the 1.5x focal length on say the DA 300mm or if i had money, the 150-450mm. That would explain why my old manual focus glass produces the prompt; I got it with my Pentax-M SMC 50mm f/1.4 this past Saturday.

10-21-2019, 10:10 PM	#234
thibs Pentaxian Join Date: Jun 2007 Location: Belgium Photos: Albums Posts: 7,001	Indeed. The DA converter 1.4x does the math but... It's a DA and doesnt cover FF as you probably all know.

10-21-2019, 10:21 PM	#235
M.B.Yates Forum Member Join Date: Jun 2013 Photos: Gallery Posts: 52	cant wait for the NEW FF teleconverter to pair up with the DFA 150-450

10-22-2019, 01:25 AM	#236
Mistral75 Pentaxian Join Date: Feb 2009 Location: Paris, France Posts: 7,527	Originally posted by M.B.Yates cant wait for the NEW FF teleconverter to pair up with the DFA 150-450 Even if you can't, I'm afraid you'll have to...

10-22-2019, 01:33 AM - 1 Like	#237
gazonk Pentaxian Join Date: Feb 2009 Location: Oslo area, Norway Photos: Gallery \| Albums Posts: 3,746	I bought a Soligor 2x teleconverter when I was a teenager. It’s the most useless piece of photography equipment I own, and it has made me a life time sceptic of teleconverters.

10-22-2019, 12:25 PM	#238
Erictator Site Supporter Join Date: Jul 2011 Photos: Gallery \| Albums Posts: 3,344	Originally posted by gazonk I bought a Soligor 2x teleconverter when I was a teenager. It’s the most useless piece of photography equipment I own, and it has made me a life time sceptic of teleconverters. Some of the thinner ones make dandy extension tubes after you knock the coke bottle bottom glass out of the middle. Eric

10-22-2019, 07:49 PM	#239
ecostigny Pentaxian Join Date: Nov 2017 Location: Branford, CT Posts: 561	I had a Kiron teleconverter back in the 1980s that I paired with my Vivitar Series 1 70-210mm f/2.8-4. It worked OK, but I didn't use that combination much because what teleconverters magnify best is camera shake. I did try that pair a few years back with my K-5 to photograph the moon. Forget chromatic aberration manifesting as purple or green fringing--this was bright blue! I've been avoiding using teleconverters with high-contrast subjects ever since.

10-23-2019, 12:42 AM	#240
gazonk Pentaxian Join Date: Feb 2009 Location: Oslo area, Norway Photos: Gallery \| Albums Posts: 3,746	Originally posted by Erictator Some of the thinner ones make dandy extension tubes after you knock the coke bottle bottom glass out of the middle. Eric LOL! But I have a nice old set of Vivitar extension tubes which work well with old lenses (It has been a while since I used them myself, but my son have used them with his M-50mm/4 macro to get some creepy spider baby shots!)