Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
08-07-2018, 12:50 AM   #29371
Pentaxian




Join Date: Jun 2013
Location: Newcastle
Photos: Gallery | Albums
Posts: 1,954
QuoteOriginally posted by normhead Quote
Have you ever tried the F 1.7x AF Adapter on it? I use it on my Tamron 300 2.8 all the time and it performs very well. That would get you to 510mm 4.5 with limited AF for a fraction the price of a 500mm 4.5 lens.
I didn't think to use the 1.7x adapter mainly because I have been dissatisfied with it (never seems to do well on combo's).

Well, a very quick test in dim light has me curious to test some more. I have combined the A*300/2.8 with 1.4XL and 1.7XF tc's. Image quality was surprisingly good. Also, light transmittance was good enough to allow for AF to function (perhaps this is related to the quality of the A*300mm lens (perhaps the T-stop of the A*300 is better than the average bear).

If the above combo works in broad daylight and the IQ is better than cropping then I have a semi-AF 714mm f5.6? - if so - AWESOME

08-07-2018, 12:17 PM - 14 Likes   #29372
Site Supporter
Site Supporter
swip's Avatar

Join Date: Sep 2011
Location: Ottawa, Ontario
Photos: Gallery
Posts: 1,212
QuoteOriginally posted by Wild Mark Quote
I didn't think to use the 1.7x adapter mainly because I have been dissatisfied with it (never seems to do well on combo's).

Well, a very quick test in dim light has me curious to test some more. I have combined the A*300/2.8 with 1.4XL and 1.7XF tc's. Image quality was surprisingly good. Also, light transmittance was good enough to allow for AF to function (perhaps this is related to the quality of the A*300mm lens (perhaps the T-stop of the A*300 is better than the average bear).

If the above combo works in broad daylight and the IQ is better than cropping then I have a semi-AF 714mm f5.6? - if so - AWESOME


The 1.7X TC works really well on the A*300/2.8. Not sure about adding a 1.4X TC though.

---------- Post added 08-07-18 at 03:51 PM ----------

A few from this past weekend.











08-07-2018, 01:03 PM   #29373
Pentaxian
str8talk83's Avatar

Join Date: May 2008
Location: Naples, FL
Photos: Albums
Posts: 618
QuoteOriginally posted by swip Quote
The 1.7X TC works really well on the A*300/2.8. Not sure about adding a 1.4X TC though.

---------- Post added 08-07-18 at 03:51 PM ----------

A few from this past weekend.
Great shots. The TC does appear to pair nicely with that lens.
08-07-2018, 01:10 PM   #29374
Loyal Site Supporter
Loyal Site Supporter
jacamar's Avatar

Join Date: Feb 2011
Location: Toronto
Photos: Albums
Posts: 1,881
QuoteOriginally posted by swip Quote
A few from this past weekend.
Those darned "fall" warblers! Cape May? Nice shots.

08-07-2018, 02:50 PM   #29375
Pentaxian




Join Date: Jun 2013
Location: Newcastle
Photos: Gallery | Albums
Posts: 1,954
QuoteOriginally posted by swip Quote
The 1.7X TC works really well on the A*300/2.8. Not sure about adding a 1.4X TC though.
So I see. Very nice. I have been quite disappointed in the F1.7X tc. But, perhaps, that toy was made specifically for the long A* lenses not necessarily for the other focal lengths. This logic would make sense as the F series had no 'fast' 200mm, 300mm or 400mm options whereas the A series did.
08-07-2018, 09:02 PM - 1 Like   #29376
dbs
Site Supporter
Site Supporter




Join Date: Jun 2010
Location: Clare Valley S A
Posts: 2,271
QuoteOriginally posted by Ducatigaz Quote
K-3ii/FA*600mm F4 ED [IF]/Gitzo 1348



K-5/Sigma 300mm F2.8 EX DG















Hi Gary

Nice shots there of not normally seen planes

Dave
08-07-2018, 10:12 PM   #29377
Pentaxian
ChipB's Avatar

Join Date: Nov 2007
Location: Austin, TX area
Photos: Gallery | Albums
Posts: 2,208
QuoteOriginally posted by swip Quote
The 1.7X TC works really well on the A*300/2.8. Not sure about adding a 1.4X TC though.

---------- Post added 08-07-18 at 03:51 PM ----------

A few from this past weekend.
Very nice - well shot!!
08-08-2018, 04:14 AM - 5 Likes   #29378
Pentaxian
Mike.P's Avatar

Join Date: Mar 2008
Location: South Coast .. UK
Photos: Gallery
Posts: 1,942
A couple of years ago I sold my Sigma 50-500mm OS as I splashed out on the 150-450mm WR but as much as I love the Pentax lens I missed the close focus ability of the Sigma. Anyway, managed to find a minter the other day for a reasonable price (they seem to have shot up in value lately) so jumped at it ....

500mm on the K-3II


Bee
by Mike.Pursey, on Flickr

08-08-2018, 06:03 AM   #29379
Pentaxian
str8talk83's Avatar

Join Date: May 2008
Location: Naples, FL
Photos: Albums
Posts: 618
QuoteOriginally posted by Mike.P Quote
A couple of years ago I sold my Sigma 50-500mm OS as I splashed out on the 150-450mm WR but as much as I love the Pentax lens I missed the close focus ability of the Sigma. Anyway, managed to find a minter the other day for a reasonable price (they seem to have shot up in value lately) so jumped at it ....

500mm on the K-3II


Bee
by Mike.Pursey, on Flickr
Nice shot! Short minimum focusing distance is definitely a perk of the 50-500. We sometimes forget how much this adds to the versatility of a lens.
08-08-2018, 06:57 AM - 4 Likes   #29380
Pentaxian
Site Supporter
normhead's Avatar

Join Date: Jun 2007
Location: Near Algonquin Park
Photos: Gallery | Albums
Posts: 31,937
QuoteOriginally posted by Wild Mark Quote
I didn't think to use the 1.7x adapter mainly because I have been dissatisfied with it (never seems to do well on combo's).

Well, a very quick test in dim light has me curious to test some more. I have combined the A*300/2.8 with 1.4XL and 1.7XF tc's. Image quality was surprisingly good. Also, light transmittance was good enough to allow for AF to function (perhaps this is related to the quality of the A*300mm lens (perhaps the T-stop of the A*300 is better than the average bear).

If the above combo works in broad daylight and the IQ is better than cropping then I have a semi-AF 714mm f5.6? - if so - AWESOME
I stack TCs on my DA*200, on my Tamron 2.8 it says right in the literature it doesn't work with stacked TCs, which I've confirmed. That in itself makes the A-300 attractive.

A stacked TC combo on DA*200 image.


DA*200 and stacked TCs (HD DA 1.4 TC and F 1.7x AF adapter.) slideshow.

People tell me stacked adapters are just wrong, but they won't say what's wrong with the pictures. It's one of those weird things.

Last edited by normhead; 08-08-2018 at 07:02 AM.
08-08-2018, 07:00 AM - 1 Like   #29381
Site Supporter
Site Supporter
swip's Avatar

Join Date: Sep 2011
Location: Ottawa, Ontario
Photos: Gallery
Posts: 1,212
QuoteOriginally posted by str8talk83 Quote
Great shots. The TC does appear to pair nicely with that lens.


I may have unintentionally implied the pictures were taken with the A*300/2.8+1.7X TC but they were not.
The photos were taken with a Sigma 500/4.5. But the A*300/2.8+1.7x TC should yield similar IQ based on my experience.
08-08-2018, 08:29 AM - 3 Likes   #29382
Pentaxian
h4yn0nnym0u5e's Avatar

Join Date: Mar 2016
Location: Cambridgeshire, UK
Photos: Albums
Posts: 320
DA*300 + K-1, cropped to just under 50% of the original resolution:

08-08-2018, 09:55 AM   #29383
Pentaxian
ChipB's Avatar

Join Date: Nov 2007
Location: Austin, TX area
Photos: Gallery | Albums
Posts: 2,208
QuoteOriginally posted by Mike.P Quote
A couple of years ago I sold my Sigma 50-500mm OS as I splashed out on the 150-450mm WR but as much as I love the Pentax lens I missed the close focus ability of the Sigma. Anyway, managed to find a minter the other day for a reasonable price (they seem to have shot up in value lately) so jumped at it ....

500mm on the K-3II
QuoteOriginally posted by normhead Quote
I stack TCs on my DA*200, on my Tamron 2.8 it says right in the literature it doesn't work with stacked TCs, which I've confirmed. That in itself makes the A-300 attractive.

A stacked TC combo on DA*200 image.

People tell me stacked adapters are just wrong, but they won't say what's wrong with the pictures. It's one of those weird things.
QuoteOriginally posted by h4yn0nnym0u5e Quote
DA*300 + K-1, cropped to just under 50% of the original resolution:
Some very good shots here!!
08-08-2018, 01:15 PM   #29384
Pentaxian
h4yn0nnym0u5e's Avatar

Join Date: Mar 2016
Location: Cambridgeshire, UK
Photos: Albums
Posts: 320
QuoteOriginally posted by ChipB Quote
Some very good shots here!!
Thanks Chip!
08-09-2018, 02:24 AM - 10 Likes   #29385
Pentaxian




Join Date: Feb 2010
Location: Blunsdon,Wiltshire, UK
Photos: Gallery
Posts: 1,090
Here is a Leveret which ended up running towards my parked car and sitting about two feet from the drivers door [should have taken another camera with a smaller lens on]

K-3ii/FA*600mm ED [IF]/Eckla window mount.





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!
300mm, 300mm plus lens, 560mm, beach, birds, canada, chickadee, club, coast, couple, dogs, feb, flickr, friend, gulf, half, lens club, lenses, love, moon, pentax lens, pm, post, scene, sea, series, shore, shot, sigma, sunset, wife
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Soviet lenses club Voe Lens Clubs 3743 22 Hours Ago 01:07 PM
The Sigma Lens Club- All lenses Blue Lens Clubs 2258 1 Day Ago 11:08 PM
Wanted - Acquired: Long lens >300mm in K-mount pop4 Sold Items 1 10-03-2010 03:03 AM
Pentax DA 55-300mm vs Tamron 70-300mm at long end (brickwall) tcdk Pentax SLR Lens Discussion 17 11-15-2009 12:52 AM



All times are GMT -7. The time now is 11:45 AM. | 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