Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
03-13-2014, 09:37 PM - 1 Like   #1
Veteran Member
enoxatnep's Avatar

Join Date: Nov 2008
Location: The edge of nowhere, Alberta, Canada
Photos: Gallery | Albums
Posts: 467
Pentax 1.4x rear converter/teleconverter thoughts

I just learned this evening about the new 1.4x teleconverter and was excited to learn more details. However, the price was over twice what I had hoped. I got partially over that by reading the specs on the Ricoh site; learning that it's AW to complement my weather-sealed lenses was one plus. Another was its compatibility with screw-mount and SDM/DC lenses. Then I put on different lenses and zoomed them out 1.4x to see if the extra reach was worth it: 50 mm to 70 mm, 135 mm to 190 mm, etc. However, especially from 135 to 190 mm, the degree of reach didn't seem all that impressive to me, especially given what one would pay.

I'd have to conclude that the amount of extra reach given the frankly outrageous price makes this a tough sell for me. God forbid if they ever come out with a 1.7x or 2x converter; the price would be almost as much as my DA* 16-50 or 50-135, respectively!! Maybe someone who disagrees with my conclusion can shed some light as to why this might be a GOOD purchase?

03-13-2014, 09:41 PM - 1 Like   #2
Site Supporter
boriscleto's Avatar

Join Date: Dec 2009
Location: Liverpool, NY
Photos: Gallery
Posts: 12,874
It's not for shorter lenses. It's for the 60-250, 300 & 560. One day it will allow the shorter DA lenses to work with the you-know-what.
03-13-2014, 09:55 PM   #3
Veteran Member
crewl1's Avatar

Join Date: Jul 2010
Location: Los Angeles, CA
Photos: Gallery | Albums
Posts: 9,797
I think the primary sucker target market for this converter are long lens shooters, specifically those with the DA*300 like me.
I'm wanting one
03-13-2014, 10:40 PM   #4
Loyal Site Supporter
AquaDome's Avatar

Join Date: Jan 2014
Location: New Carlisle, IN
Photos: Gallery | Albums
Posts: 1,472
QuoteOriginally posted by boriscleto Quote
It's not for shorter lenses. It's for the 60-250, 300 & 560. One day it will allow the shorter DA lenses to work with the you-know-what.
Someone should test this theory on a film-body. If it really does what you didn't say...

03-13-2014, 11:36 PM   #5
Pentaxian




Join Date: Sep 2009
Location: Southern California
Photos: Gallery | Albums
Posts: 3,181
QuoteOriginally posted by enoxatnep Quote
I'd have to conclude that the amount of extra reach given the frankly outrageous price makes this a tough sell for me. God forbid if they ever come out with a 1.7x or 2x converter; the price would be almost as much as my DA* 16-50 or 50-135, respectively!! Maybe someone who disagrees with my conclusion can shed some light as to why this might be a GOOD purchase?
If you take a look over here it appears normhead is getting very nice results with it. This doesn't mean I disagree with you, but if the quality's high it's a good purchase for some people. His photos have certainly made me consider it for my F*300.

https://www.pentaxforums.com/forums/16-pentax-news-rumors/250767-hd-teleconve...ounced-17.html
03-13-2014, 11:56 PM - 1 Like   #6
Veteran Member
Barry Pearson's Avatar

Join Date: Jul 2013
Location: Stockport
Posts: 870
QuoteOriginally posted by AquaDome Quote
Someone should test this theory on a film-body. If it really does what you didn't say...
The first thing I did when my Pentax 1.4x Teleconverter arrived yesterday was to attach it to my Pentax Z-1p film camera. Then I attached various lenses (below) that might be expected to hard-vignette. None of them showed signs of vignetting, looking through the viewfinder at a well-lit surface.

The lenses I tested that apparently didn't hard-vignette at any focal length , showing image right to the corners, were:
  • DA 10-17mm Fisheye. (Not on the Pentax list of supported lenses!). This hard-vignettes on the Z-1p at 10mm and 12mm without a Teleconverter.
  • DA 12-24mm. This hard-vignettes badly on the Z-1p at wide angles without a Teleconverter.
  • DA 17-70mm. This hard-vignettes at all focal lengths on the Z-1p without a Teleconverter.
  • DA* 60-250mm.

I haven't yet tested any other lenses on the Z-1p with this Teleconverter. I may shoot my last roll of film with a range of lenses using this Teleconverter on the Z-1p to complete my previous tests of lenses on the Z-1p.

My priority is to get some experience of using it on the lenses I bought it for. In priority order (most important first) these are:
  • DA* 300mm f/4 (of course!)
  • DA* 60-250mm f/4.
  • D-FA 100mm f/2.8 WR Macro
  • Sigma 500mm f/4.5 APO

If it is good with just the 3 Pentax lenses in that list it will be well worth the money. Being good with the Sigma would be a bonus. And so far the omens are good!

This is my 3rd 1.4x Teleconverter. I have the Kenko P-AF 1.4x Teleplus MC4 and the (acclaimed) Tamron 1.4x Pz-AF MC4. These worked on the D-FA Macro and the Sigma, but even the Tamron was poor on the DA* lenses. So if the Pentax Teleconverter does what I think it will do, it will be the Kenko and the Tamron that turn out (for me) to be a waste of money.
03-14-2014, 12:17 AM   #7
Loyal Site Supporter
AquaDome's Avatar

Join Date: Jan 2014
Location: New Carlisle, IN
Photos: Gallery | Albums
Posts: 1,472
QuoteOriginally posted by Barry Pearson Quote
The first thing I did when my Pentax 1.4x Teleconverter arrived yesterday was to attach it to my Pentax Z-1p film camera. Then I attached various lenses (below) that might be expected to hard-vignette. None of them showed signs of vignetting, looking through the viewfinder at a well-lit surface.
Now there's a compelling reason to want this thing.

QuoteOriginally posted by Barry Pearson Quote
My priority is to get some experience of using it on the lenses I bought it for.
The DA*300, at 1x4, if you think in 35mm terms, is... uh... 630mm!! Even though its a teleconverter, its absolutely going to shame my FIVE STAR 600mm/f8 manual lens.
Crap. Now I gotta get a DA*300 too.
03-14-2014, 01:01 AM   #8
Veteran Member




Join Date: Oct 2007
Location: France
Photos: Albums
Posts: 804
The first reports by users justify the price. If you compare to cheaper teleconverters like Sigma for instance (priced 250 euros here vs 390 euros for the Pentax) :
There is electronic Inside to convert focal length and aperture. Focal length convertion is a must to have proper image stabilisation. Sigma seems to make a direct connection of the contacts (I have one).
There is a mechanical screw drive reduction to achieve precise AF. As focal length is increased, a demultiplication of the AF in order to maintain AF precision.
Added to WR and HD coatings, this justify at least a 100 euros add on the price. For me, the converter is only slightly overpriced, this is normal for a brand new items. Here in France it solds as hot cakes, it is a common practice to overprice this first items and let the price decrease at time goes.

03-14-2014, 01:44 AM   #9
Pentaxian
aleonx3's Avatar

Join Date: Jul 2007
Location: Brampton, Ontario
Photos: Gallery | Albums
Posts: 3,888
QuoteOriginally posted by boriscleto Quote
It's not for shorter lenses. It's for the 60-250, 300 & 560. One day it will allow the shorter DA lenses to work with the you-know-what.
I agree that this teleconverter is mostly more beneficial for longer lenses (ie. 300, 60-250 or like). But I also find this converter to be an excellent alternative to extend the reach for my DA* 16-50/50-135 lenses. It works so well that I can use both lenses nice and sharp at wide-open aperture on both short- and long-end focal length of the lenses.
03-14-2014, 04:09 AM   #10
Site Supporter
Stone G.'s Avatar

Join Date: Jun 2010
Location: North Zealand, Denmark
Photos: Gallery | Albums
Posts: 1,516
QuoteOriginally posted by AquaDome Quote
Someone should test this theory on a film-body. If it really does what you didn't say...
Oh, but that's what a 1.4X TC does: It magnifies the viewing angle by a factor of 1.4 and thus, also the diameter of the image circle. You can test that with any 1.4X teleconverter on a film- or (CaNikon) DSLR body.
03-14-2014, 04:23 AM   #11
Banned




Join Date: Feb 2014
Location: Perth, Australia
Posts: 120
QuoteOriginally posted by enoxatnep Quote
I just learned this evening about the new 1.4x teleconverter and was excited to learn more details. However, the price was over twice what I had hoped. I got partially over that by reading the specs on the Ricoh site; learning that it's AW to complement my weather-sealed lenses was one plus. Another was its compatibility with screw-mount and SDM/DC lenses. Then I put on different lenses and zoomed them out 1.4x to see if the extra reach was worth it: 50 mm to 70 mm, 135 mm to 190 mm, etc. However, especially from 135 to 190 mm, the degree of reach didn't seem all that impressive to me, especially given what one would pay.

I'd have to conclude that the amount of extra reach given the frankly outrageous price makes this a tough sell for me. God forbid if they ever come out with a 1.7x or 2x converter; the price would be almost as much as my DA* 16-50 or 50-135, respectively!! Maybe someone who disagrees with my conclusion can shed some light as to why this might be a GOOD purchase?
Stop bagging the 1.4x TC enoxatnep until you buy one and actually start using it and get the benefits from it!! you know nothing about it yet, get it some time!!
03-14-2014, 04:58 AM   #12
Pentaxian
Gray's Avatar

Join Date: Oct 2011
Location: Cape Town
Photos: Gallery
Posts: 387
A great alternative to the new hyperpriced 1.4 converter is the Tamron PZ 1.4x - less than half the price, superb IQ coupled with the ability to AF screw as well as SDM and HSM lenses. Doesn't give WR and automatic adjusted focal length data, but that's not an issue for me.

The Tamron It works very well with my K-5II/DA* 60-250 set up (and even with my Sigma 50-500 HSM given enough light).

Tamron-F 1.4X Pz-AF MC4 Lens Reviews - Miscellaneous Lenses - Pentax Lens Review Database (Rating 9.4)

Last edited by Gray; 03-14-2014 at 07:53 AM. Reason: Added link to PF review.
03-14-2014, 07:59 AM   #13
Senior Moderator
Loyal Site Supporter
Parallax's Avatar

Join Date: Apr 2008
Location: South Dakota
Photos: Gallery
Posts: 15,623
QuoteOriginally posted by JASMAZ77 Quote
Stop bagging the 1.4x TC enoxatnep until you buy one and actually start using it and get the benefits from it!! you know nothing about it yet, get it some time!!
You made this same comment to someone else in a different thread on the same subject. Perhaps you should stop telling other members what they should and shouldn't post!!
03-14-2014, 07:59 AM   #14
Veteran Member
awaldram's Avatar

Join Date: May 2008
Location: Hampshire
Photos: Gallery
Posts: 720
QuoteOriginally posted by Gray Quote
The Tamron It works very well with my K-5II/DA* 60-250 set up (and even with my Sigma 50-500 HSM given enough light).
Please define your definition of 'very well'

Owning both the Pz variant I suspect your 'very well' equates with my 'not worth a dxmn'

To me working well means I can switch to AF-c track a birds in flight fire the shutter at will and capture a sharp image

Working OK Means I half press the shutter the camera focuses and locks

'Not worth a dxmn' means I press the shutter a number of times trying to encourage the AF to achieve lock.

With 1.4 Pz converters I've achieved between OK and 'Not worth a dxmn' with different lens on different bodies at different times, A whole world of frustration and I would not recomend purchasing a Pz converter at any price for SDM/HSM use.

A complete waste of money for that purpose IMO.
03-14-2014, 08:21 AM   #15
Veteran Member
enoxatnep's Avatar

Join Date: Nov 2008
Location: The edge of nowhere, Alberta, Canada
Photos: Gallery | Albums
Posts: 467
Original Poster
QuoteOriginally posted by boriscleto Quote
It's not for shorter lenses. It's for the 60-250, 300 & 560.
QuoteOriginally posted by goubejp Quote
The first reports by users justify the price. If you compare to cheaper teleconverters like Sigma for instance (priced 250 euros here vs 390 euros for the Pentax) :
There is electronic Inside to convert focal length and aperture. Focal length convertion is a must to have proper image stabilisation. Sigma seems to make a direct connection of the contacts (I have one).
There is a mechanical screw drive reduction to achieve precise AF. As focal length is increased, a demultiplication of the AF in order to maintain AF precision.
Added to WR and HD coatings, this justify at least a 100 euros add on the price.
Very good points, indeed. Regarding the first comment, it probably won't benefit me much if my longest lens is my DA* 50-135!

---------- Post added 03-14-2014 at 09:30 AM ----------

QuoteOriginally posted by aleonx3 Quote
I agree that this teleconverter is mostly more beneficial for longer lenses (ie. 300, 60-250 or like). But I also find this converter to be an excellent alternative to extend the reach for my DA* 16-50/50-135 lenses. It works so well that I can use both lenses nice and sharp at wide-open aperture on both short- and long-end focal length of the lenses.
I used my old A 70-210 to extend from 135mm to 190mm (a 1.4x increase) and really didn't get excited by the difference. Likewise, I did the same experiment from 50 to 70 using my 50-135 and noticed a slightly bigger difference. I suppose, however, that those who wanted the 16-50 to be a 16-70, for example, could now have it without packing two lenses around, and you're only losing 1 f-stop - f/4 isn't so bad. But I'm glad the long-zoom users pitched in to help me realize that it's really best for their situation; NOW I understand the real purpose of a 1.4x teleconverter!

All that said, I'll probably get restless someday and buy one anyhow; if it would help my DA* zooms even a little, that would be worth it to me, especially having the weather-sealing. It would also be interesting to see the effects with my FA 50 f/1.4 and DA 35 Macro.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
1.4x, af, converter, cost, da*, euros, justify, k-mount, length, lenses, light, mm, pentax, pentax 1.4x, pentax lens, price, pz, rear, ricoh, sigma, slr lens, tamron, teleconverter, users
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Wanted - Acquired: Pentax Rear Converter-A 1.4X-L Weevil Sold Items 8 02-10-2014 02:32 PM
Pentax 67 1.4X rear converter gurtch Pentax Medium Format 10 10-24-2013 12:00 AM
For Sale - Sold: Pentax SMC A 1.4x-L Rear Converter littledrawe Sold Items 4 03-21-2013 11:18 PM
Wanted - Acquired: 6x7 1.4X teleconverter (rear converter) littledrawe Sold Items 2 01-22-2012 08:01 PM



All times are GMT -7. The time now is 08:14 PM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top