Pentax HD Pentax 1.4x Teleconverter


Mike-P

Link Posted 31/01/2014 - 09:21
Interesting post on DPR from someone who seems to know a bit about Pentax.

Quote:
Be sure,all the electronic stuff is inside the converter.

Every ID is transmitted between camera and lens.

And the nice point should be,the release date means new firmware.

The current Pentax bodys are without any converter ID and logic.

New firmware should bring the autofocus back to most converters

Donīt sell your converters to quick


. My Flickr
Last Edited by Mike-P on 31/01/2014 - 09:22

Algernon

Link Posted 31/01/2014 - 11:34
Unless dramatic improvements have taken place with Pentax SR since the K-7 it wasn't really suitable for long lenses and was optimised for use at 1/25th sec. so don't expect miracles

--
Half Man... Half Pentax ... Half Cucumber

Pentax K-1 + K-5 and some other stuff

Algi

gwing

Link Posted 31/01/2014 - 12:39
JonSchick wrote:
Hope the tc allows the SR to work at the corrected focal length.

That shouldn't be too hard to do. We can already do this today with any TC and any old manual lens so, even without any actual improvements, all we would need would be a firmware change to also allow manual f/l choice with AF lenses as well.

LennyBloke

Link Posted 31/01/2014 - 13:15
What is the longest lens you can use with a TC and SR (i.e. not on a tripod)? I've used a 300 with a TC handheld and got some reasonable results (I would normally use a tripod with this combination), but I would have thought it gets less and less good the longer you go
LennyBloke

johnriley

Link Posted 31/01/2014 - 13:26
I was thinking that for wildlife, SR could well be switched off. This would minimise any delay when firing the shutter. In any event we need high shutter speeds to avoid subject movement.
Best regards, John

dcweather

Link Posted 31/01/2014 - 13:56
Indeed we do John and I think people often forget this. A small bird is constantly moving its head even if it appears still. Another reason why we tend to use burst mode. Back to the notion of a heavy f2,8 300mm - provided the f4 focuses well with a TC isn't F4 the new F2.8 with the current improvements in noise levels of at least one stop ISO equivalent esp. for birds? (Disregarding DOF which could be too narrow a lot of the time at F2.8
Last Edited by dcweather on 31/01/2014 - 13:56

gwing

Link Posted 31/01/2014 - 14:29
dcweather wrote:
Indeed we do John and I think people often forget this. A small bird is constantly moving its head even if it appears still. Another reason why we tend to use burst mode. Back to the notion of a heavy f2,8 300mm - provided the f4 focuses well with a TC isn't F4 the new F2.8 with the current improvements in noise levels of at least one stop ISO equivalent esp. for birds? (Disregarding DOF which could be too narrow a lot of the time at F2.8

I guess so, but not entirely the same though. F2.8 lets you put on *both* a 1.4x and 1.7af converter and still get AF

Gamka

Link Posted 31/01/2014 - 16:46
LennyBloke wrote:
What is the longest lens you can use with a TC and SR (i.e. not on a tripod)? I've used a 300 with a TC handheld and got some reasonable results (I would normally use a tripod with this combination), but I would have thought it gets less and less good the longer you go

Frequently use 300mm with a x2 and occasionally up to 600mm with the TC too. With something to lean back against on on it is OK in good S African light.

This was taken using a 400-600 with x2. Handheld and SR manually set to 800.


Last Edited by Gamka on 31/01/2014 - 16:52

gwing

Link Posted 31/01/2014 - 17:40
Algernon wrote:
Unless dramatic improvements have taken place with Pentax SR since the K-7 it wasn't really suitable for long lenses and was optimised for use at 1/25th sec. so don't expect miracles

--

That's something I hadn't heard Algi, do you have a link to where optimisation of the SR is dicussed/published?

Algernon

Link Posted 31/01/2014 - 17:47
gwing wrote:
Algernon wrote:
Unless dramatic improvements have taken place with Pentax SR since the K-7 it wasn't really suitable for long lenses and was optimised for use at 1/25th sec. so don't expect miracles

--

That's something I hadn't heard Algi, do you have a link to where optimisation of the SR is dicussed/published?

Falk Lumo did some extensive testing ..... Pentaxforums

Most of the SR tagged threads.....

http://www.pentaxforums.com/forums/tags/shake/

I'm quite sure the K-3 will be better not sure about the K-5?

I normally use 1/320th with a 300mm + 1.7x on a K-5 and very
rarely have shake problems.

--
Half Man... Half Pentax ... Half Cucumber

Pentax K-1 + K-5 and some other stuff

Algi
Last Edited by Algernon on 31/01/2014 - 18:18

FAT8BIKER

Link Posted 31/01/2014 - 21:42
dcweather wrote:
Indeed we do John and I think people often forget this. A small bird is constantly moving its head even if it appears still. Another reason why we tend to use burst mode. Back to the notion of a heavy f2,8 300mm - provided the f4 focuses well with a TC isn't F4 the new F2.8 with the current improvements in noise levels of at least one stop ISO equivalent esp. for birds? (Disregarding DOF which could be too narrow a lot of the time at F2.8

Canon 400mm f/5.6 is rated as one of the best lenses for for wild life, at a reasonable price, and has no IS.
Cheers
Dave

dcweather

Link Posted 02/02/2014 - 22:21
Mike-P wrote:
Interesting post on DPR from someone who seems to know a bit about Pentax.

Quote:
Be sure,all the electronic stuff is inside the converter.

Every ID is transmitted between camera and lens.

And the nice point should be,the release date means new firmware.

The current Pentax bodys are without any converter ID and logic.

New firmware should bring the autofocus back to most converters

Donīt sell your converters to quick


"So now we are speculating on the rumoured performance of a rumoured teleconverter?"

jules

Link Posted 04/02/2014 - 06:37
Pic does have a certain reality to it, I'm hoping!
I'm hoping it plays well with my DA*300 obviating the need for the also vapour ware 135-380, at least we have a picture of a convertor...
Cheers Jules...

My viewfinder is 576,000,000 pixels.

www.exaggeratedperspectives.com

jules

Link Posted 05/02/2014 - 09:26
Starting to gain momentum...

http://photorumors.com/2014/02/04/new-ricoh-wg-20-and-wg-4-compact-cameras-leake...
Cheers Jules...

My viewfinder is 576,000,000 pixels.

www.exaggeratedperspectives.com

Smeggypants

Link Posted 05/02/2014 - 23:00
Ta-Daaaaaa!!!


http://www.dpreview.com/news/2014/02/05/ricoh-announces-hd-pentax-da-af-1-4x-aw-...
[i]Bodies: 1x K-5IIs, 2x K-5, Sony TX-5, Nokia 808
Lenses: Pentax DA 10-17mm ED(IF) Fish Eye, Pentax DA 14mm f/2.8, Sigma 17-70mm f/2.8, Pentax-A 28mm f/2.8, Sigma 30mm F1.4 EX DC, Pentax-A 50mm f/1.2, Pentax-A 50mm f/1.4, Pentax-FA 50mm f/1.4, Pentax-A 50mm f/1.7, Pentax DA* 50-135mm f/2.8, Sigma 135-400mm APO DG, and more ..
Flash: AF-540FGZ, Vivitar 283
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