Image of HD Pentax 1.4x Teleconverter

lancer3397 · 01-31-2014, 12:46 PM

my thoughts also.

well I suppose it all depends on what level of picture quality they are aiming for doesn't it.

automatically a few people seem to be jumping to the conclusion that it will be equivalent to DA 60-250 or sigma 100-300 in picture quality, ergo more money.

but the HD WR 55-300 is not stunning money. if they are building it to be as good as the 55-300 then I can't see how a £850 - £1100 won't be impossible.

it's all a balance of sales against no sales surely? a mid quality, pentax made WR telephoto lens with the new HD coatings to fill the gap in their lens lineup will garner interest from a lot of users and maybe even tempt across users of other systems. producing a top drawer WR HD telephoto modelled on the likes of the DA 60-250 will garner a lot of drooling but the price will put a lot of people off.

bearing in mind, take a 60-250, add the new 1.5 TC and at 1.5 crop on the APS-C you have 575mm equivalent.

the 135-380 lens is equivalent to 570mm. now why make a 135-380 telephoto at huge money on that basis. who is it going to tempt?

it's not long enough for hardcore birders, and a lot of people with the 60-250 might be content with just adding the new TC to their collection and keeping their lens rather than spend more money and upgrade.

**Zygonyx** · 01-31-2014, 01:32 PM

I don't think those two zooms will compete.
I don't think the DA135-380 will be more expensive than DA*60-250 + TC, actually i see it in the same price range as DA*60-250.
Also, one stop difference is not negligible in the long ends.

kosmoejtg · 02-01-2014, 11:54 AM

Didn't Sigma offer a 1.4 and 2.0 teleconverter for Pentax? Is finding a used one a good (less expensive) alternative to the Pentax teleconverter?

**ElJamoquio** · 02-01-2014, 12:16 PM

They did/do.

They aren't that good IMO.

**woodywesty** · 02-01-2014, 12:50 PM

Originally posted by kosmoejtg

Didn't Sigma offer a 1.4 and 2.0 teleconverter for Pentax? Is finding a used one a good (less expensive) alternative to the Pentax teleconverter?

They stopped offering the 1.4 TC a year or so ago. I talked with (email exchange) the rep at Sigma who indicated that the TC for Pentax just wasn't a money maker for Sigma. Makes me wonder if they will continue with the 2.0TC and why some of their lenses must be profitable to be offered in K mount and others not profitable??

kosmoejtg · 02-01-2014, 12:57 PM

I have a Sigma 150- 500mm and the manual mentions the teleconverter but it is not available anymore. I am surprised that the lens comes with IS. You would think they would leave that our for Pentax and Sony but maybe it is too expensive to retool for that.

**ElJamoquio** · 02-01-2014, 01:05 PM

Originally posted by kosmoejtg

I have a Sigma 150- 500mm and the manual mentions the teleconverter but it is not available anymore. I am surprised that the lens comes with IS. You would think they would leave that our for Pentax and Sony but maybe it is too expensive to retool for that.

For long lenses, I find optical stabilization valuable sometimes... makes it easier to frame things handheld. I'm glad it's still on there.

FYI, when they take out the HSM or OS they never reduce the price.

kosmoejtg · 02-01-2014, 01:13 PM

You would think that OS adds cost and weight to a lens. How great would it be if we could get a lens for 10% less $ and weight than Nikon or Canon? It would just add to the reason why Pentax is a great option.

VisualDarkness · 02-01-2014, 01:16 PM

Originally posted by kosmoejtg

Didn't Sigma offer a 1.4 and 2.0 teleconverter for Pentax? Is finding a used one a good (less expensive) alternative to the Pentax teleconverter?

1. They only work (physically) with a select number of lenses.
2. Some lenses can't focus all their range with it.
3. They lack HSM/SDM contacts in Pentax mount

asahi man · 02-01-2014, 03:10 PM

Originally posted by kosmoejtg

Didn't Sigma offer a 1.4 and 2.0 teleconverter for Pentax? Is finding a used one a good (less expensive) alternative to the Pentax teleconverter?

Both are out of production and not in sight with a new production run.
Best regards

**manishved** · 02-01-2014, 03:31 PM

Originally posted by asahi man

Both are out of production and not in sight with a new production run.
Best regards

There are several used ones out there..IMHO they are awesome...

kosmoejtg · 02-01-2014, 03:41 PM

Originally posted by manishved

There are several used ones out there..IMHO they are awesome...

Have you used one? I just checked and there is one for $140 on Ebay.

**manishved** · 02-01-2014, 03:46 PM

Just make sure you get either Tamron or Kenko with the SDM connectors so that you can use it with SDM lenses...

rawr · 02-01-2014, 05:27 PM

Originally posted by Zygonyx

DA*60-250 + TC

Originally posted by kosmoejtg

I have a Sigma 150- 500mm

Call me prejudiced against TC, even though I have 3 of them, but I've personally never seen a good result using TC with zooms.

Unless all the components of the whole system (lens and TC) are of superb optical quality and designed to work together, using zooms with TC is bound to disappoint. Exceptions may be the built-in 1.4 TC of the new Canon 200-400 f4L, or the grey 'long-neck' Pentax A 1.4XL TC mated with some specific FA* telephoto zooms.

gazonk · 02-03-2014, 06:45 AM

I have only one teleconverter, a Vivitar 2x I bought around 30 years ago, and which I still haven't taken a single useful picture with. It's simply not sharp enough. So I guess I'm suspicious.

I wonder though, is there any chance that this teleconverter would make any sense on my DA55-300 (on K-5)? Or will I be better off cropping? The sharpness of the DA55-300 isn't exactly overwhelming at 300mm, but I think the center sharpness is OK when used at fairly close range (in contrast - it always seems pretty "muddy" to me when focused at infinity).

I guess I'll know soon, since the 55-300 is a quite common lens I guess someone will test the 1.4 converter with that lens as soon as it is released.

Thread Tools	Search this Thread
Show Printable Version E-mail to a Friend	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Vivitar 1.4x Teleconverter for Pentax k30?	iittoo	Pentax SLR Lens Discussion	14	12-27-2013 12:55 PM
Wanted - Acquired: Sigma APO Teleconverter 1.4x EX DG for Pentax Mount	iittoo	Sold Items	2	05-11-2013 06:44 PM
For Sale - Sold: Tamron-F 1.4X Pz-AF MC4 Teleconverter for Pentax	stormtech	Sold Items	2	01-24-2013 10:19 AM
For Sale - Sold: Tamron 1.4x Pz-AF MC4 Teleconverter for Pentax	dgaies	Sold Items	5	02-24-2012 01:38 PM

01-31-2014, 12:46 PM	#136
lancer3397 Inactive Account Join Date: Aug 2011 Location: Leeds Posts: 49	my thoughts also. well I suppose it all depends on what level of picture quality they are aiming for doesn't it. automatically a few people seem to be jumping to the conclusion that it will be equivalent to DA 60-250 or sigma 100-300 in picture quality, ergo more money. but the HD WR 55-300 is not stunning money. if they are building it to be as good as the 55-300 then I can't see how a £850 - £1100 won't be impossible. it's all a balance of sales against no sales surely? a mid quality, pentax made WR telephoto lens with the new HD coatings to fill the gap in their lens lineup will garner interest from a lot of users and maybe even tempt across users of other systems. producing a top drawer WR HD telephoto modelled on the likes of the DA 60-250 will garner a lot of drooling but the price will put a lot of people off. bearing in mind, take a 60-250, add the new 1.5 TC and at 1.5 crop on the APS-C you have 575mm equivalent. the 135-380 lens is equivalent to 570mm. now why make a 135-380 telephoto at huge money on that basis. who is it going to tempt? it's not long enough for hardcore birders, and a lot of people with the 60-250 might be content with just adding the new TC to their collection and keeping their lens rather than spend more money and upgrade.

01-31-2014, 01:32 PM	#137
Zygonyx Site Supporter Join Date: Jun 2011 Location: Ile de France Posts: 3,001	I don't think those two zooms will compete. I don't think the DA135-380 will be more expensive than DA60-250 + TC, actually i see it in the same price range as DA60-250. Also, one stop difference is not negligible in the long ends.

02-01-2014, 11:54 AM	#138
kosmoejtg Senior Member Join Date: Nov 2012 Location: Dundee Illinois Photos: Gallery Posts: 103	Didn't Sigma offer a 1.4 and 2.0 teleconverter for Pentax? Is finding a used one a good (less expensive) alternative to the Pentax teleconverter?

02-01-2014, 12:16 PM	#139
ElJamoquio Site Supporter Join Date: Feb 2011 Posts: 4,893	They did/do. They aren't that good IMO.

02-01-2014, 12:50 PM	#140
woodywesty Site Supporter Join Date: Jan 2013 Location: Northern Wisconsin Posts: 697	Originally posted by kosmoejtg Didn't Sigma offer a 1.4 and 2.0 teleconverter for Pentax? Is finding a used one a good (less expensive) alternative to the Pentax teleconverter? They stopped offering the 1.4 TC a year or so ago. I talked with (email exchange) the rep at Sigma who indicated that the TC for Pentax just wasn't a money maker for Sigma. Makes me wonder if they will continue with the 2.0TC and why some of their lenses must be profitable to be offered in K mount and others not profitable??

02-01-2014, 12:57 PM	#141
kosmoejtg Senior Member Join Date: Nov 2012 Location: Dundee Illinois Photos: Gallery Posts: 103	I have a Sigma 150- 500mm and the manual mentions the teleconverter but it is not available anymore. I am surprised that the lens comes with IS. You would think they would leave that our for Pentax and Sony but maybe it is too expensive to retool for that.

02-01-2014, 01:05 PM	#142
ElJamoquio Site Supporter Join Date: Feb 2011 Posts: 4,893	Originally posted by kosmoejtg I have a Sigma 150- 500mm and the manual mentions the teleconverter but it is not available anymore. I am surprised that the lens comes with IS. You would think they would leave that our for Pentax and Sony but maybe it is too expensive to retool for that. For long lenses, I find optical stabilization valuable sometimes... makes it easier to frame things handheld. I'm glad it's still on there. FYI, when they take out the HSM or OS they never reduce the price.

02-01-2014, 01:13 PM	#143
kosmoejtg Senior Member Join Date: Nov 2012 Location: Dundee Illinois Photos: Gallery Posts: 103	You would think that OS adds cost and weight to a lens. How great would it be if we could get a lens for 10% less $ and weight than Nikon or Canon? It would just add to the reason why Pentax is a great option.

02-01-2014, 01:16 PM	#144
VisualDarkness Veteran Member Join Date: Nov 2011 Location: Uppsala, Sweden Photos: Gallery Posts: 4,440	Originally posted by kosmoejtg Didn't Sigma offer a 1.4 and 2.0 teleconverter for Pentax? Is finding a used one a good (less expensive) alternative to the Pentax teleconverter? 1. They only work (physically) with a select number of lenses. 2. Some lenses can't focus all their range with it. 3. They lack HSM/SDM contacts in Pentax mount

02-01-2014, 03:10 PM	#145
asahi man Senior Member Join Date: Oct 2013 Photos: Albums Posts: 292	Originally posted by kosmoejtg Didn't Sigma offer a 1.4 and 2.0 teleconverter for Pentax? Is finding a used one a good (less expensive) alternative to the Pentax teleconverter? Both are out of production and not in sight with a new production run. Best regards

02-01-2014, 03:31 PM	#146
manishved Loyal Site Supporter Join Date: Mar 2008 Location: N. Calif Photos: Gallery \| Albums Posts: 2,585	Originally posted by asahi man Both are out of production and not in sight with a new production run. Best regards There are several used ones out there..IMHO they are awesome...

02-01-2014, 03:41 PM	#147
kosmoejtg Senior Member Join Date: Nov 2012 Location: Dundee Illinois Photos: Gallery Posts: 103	Originally posted by manishved There are several used ones out there..IMHO they are awesome... Have you used one? I just checked and there is one for $140 on Ebay.

02-01-2014, 03:46 PM	#148
manishved Loyal Site Supporter Join Date: Mar 2008 Location: N. Calif Photos: Gallery \| Albums Posts: 2,585	Just make sure you get either Tamron or Kenko with the SDM connectors so that you can use it with SDM lenses...

02-01-2014, 05:27 PM	#149
rawr Pentaxian Join Date: Jun 2009 Location: GMT +10 Photos: Albums Posts: 10,720	Originally posted by Zygonyx DA60-250 + TC Originally posted by kosmoejtg I have a Sigma 150- 500mm Call me prejudiced against TC, even though I have 3 of them, but I've personally never seen a good result using TC with zooms. Unless all the components of the whole system (lens and TC) are of superb optical quality and designed to work together, using zooms with TC is bound to disappoint. Exceptions may be the built-in 1.4 TC of the new Canon 200-400 f4L, or the grey 'long-neck' Pentax A 1.4XL TC mated with some specific FA telephoto zooms.

02-03-2014, 06:45 AM	#150
gazonk Pentaxian Join Date: Feb 2009 Location: Oslo area, Norway Photos: Gallery \| Albums Posts: 3,511	I have only one teleconverter, a Vivitar 2x I bought around 30 years ago, and which I still haven't taken a single useful picture with. It's simply not sharp enough. So I guess I'm suspicious. I wonder though, is there any chance that this teleconverter would make any sense on my DA55-300 (on K-5)? Or will I be better off cropping? The sharpness of the DA55-300 isn't exactly overwhelming at 300mm, but I think the center sharpness is OK when used at fairly close range (in contrast - it always seems pretty "muddy" to me when focused at infinity). I guess I'll know soon, since the 55-300 is a quite common lens I guess someone will test the 1.4 converter with that lens as soon as it is released.