All Forum Comments
walt wrote:
I assume there must be some lens quality control issues with the last 2 posts, where purple fringing comes up as a problem on both and neither.... Thanks for the feedback.
Older film designs, especially telephotos do tend to have some PF in my experience. I remember that PF on the Tamron was only an issue wide open but was pretty much gone by f/4. Even then it is very minor and only on specular highlights that were overexposed (on metal, glass, water, those sorts of things). The Pentax has a tiny bit of blue haloing (not quite PF) wide open in the same circumstances. Both are great lenses though.I assume there must be some lens quality control issues with the last 2 posts, where purple fringing comes up as a problem on both and neither.... Thanks for the feedback.
Here are some of the few photos I took with the Tamron 90mm Macro. I happened to be testing the lens so took a series of shots at different f-stops.
There is a bit of PF at 100% on the specular highlight on the 'nose' in this f/2.8 shot. It is a non-issue though as you can't even see it in this screen version. Resolution was amazing on the K10D. There is moire even at f/2.8!
004 by Daniel Perlak, on Flickr
Resulution peaks at f/5.6.
006 by Daniel Perlak, on Flickr
Still more than adequate at at f/13. f/16 is where the quality noticeably drops off.
012 by Daniel Perlak, on Flickr
Here are some with the Pentax 100mm WR Macro:
This one is only of the few at f/2.8 I could find with blue fringing. Bear in mind that this is a vertical crop of a landscape photo so less than 1/2 of the frame. That means any imperfections will be amplified. I've also noticed the bokeh is a bit nervous in this shot.
005 by Daniel Perlak, on Flickr
Resolution peaks at f/5.6:
012 by Daniel Perlak, on Flickr
I haven't tended to push the Pentax past f/11.
098 by Daniel Perlak, on Flickr
Here is one at f/32. You'll notice it is much softer/less detailed but you get the extra DoF.
097 by Daniel Perlak, on Flickr
I think the Tamron out resolves the Pentax a bit. The Pentax is smaller, lighter and WR.
Hope this helps.
Comment by Tyr posted on Tamron SP 90 macro or Pentax 100 WR macro at 02/08/2018 - 17:01
The detail on the fly is just stunning!
Comment by Tyr posted on 2 flies and a beetle at 02/08/2018 - 14:44
I've used both and currently have the DFA100WR. The Tamron purple fringes a lot more than the Pentax. The Pentax is smaller, lighter and WR. Pentas has quick-shift focus. The Pentax is basically a Limited in all but name, on of the best built lenses I've ever seen.
The Tamron is cheaper and has a focus limiter. The Tamron is good, but I prefer the Pentax.
The Tamron is cheaper and has a focus limiter. The Tamron is good, but I prefer the Pentax.
walt wrote:
Thanks to all who took the time to help me try and make my mind up. It may take a while..... or a bargain...
Remember that focus distance is the distance to the focal plane (sensor) not the front element!davidwozhere wrote:
Image quality between the Pentax and Tamron versions is about the same - damned good. I don't find any problem with the Tamron auto/manual clutch. The focusing ring is gigantic and the fore and aft movement is about 1/8th inch.
I think I'd be pretty happy with the image quality of either, although re-reading a test in a close-up photography magazine the Pentax 100 WR was substandard in the image quality. However even the mag said they thought this was unusual and felt that their lens was faulty. The thing it did point out to me that I'd forgotten about is that the tamron SP 90 2.8 Di has a pretty short min working distance from the front of the lens of 9cm, whereas most macros in this range have between 11-15cm with the Pentax being 13cm. Something else for me to mull over. Image quality between the Pentax and Tamron versions is about the same - damned good. I don't find any problem with the Tamron auto/manual clutch. The focusing ring is gigantic and the fore and aft movement is about 1/8th inch.
Thanks to all who took the time to help me try and make my mind up. It may take a while..... or a bargain...
Comment by Tyr posted on Tamron SP 90 macro or Pentax 100 WR macro at 01/08/2018 - 17:11
I'd rather have the built in GPS. Because I can't use GPS and flash simultaneously on the K-5. I could on any of those with an external flash.
Comment by Tyr posted on Cute moth (really!) at 31/07/2018 - 10:28
Used to drive past it when I used to work occasionally in Okehampton. Never had the chance to stop before.
Comment by Tyr posted on Dull weather but hopefully not dull photos. at 31/07/2018 - 08:12
Daronl wrote:
Dan they are really good images, did you light it with anything and what lens/ body did you use.
As I said above ( when I cslled you David -sotrry) thanks gor sharing and I sgree it is a cute little moth.
Regards
K-5 with DFA100WR using the built-in flash and a piece of A4 paper as a bounce card.Dan they are really good images, did you light it with anything and what lens/ body did you use.
As I said above ( when I cslled you David -sotrry) thanks gor sharing and I sgree it is a cute little moth.
Regards
Comment by Tyr posted on Cute moth (really!) at 31/07/2018 - 08:10
Little bit of a hidden gem on Dartmoor, Wheal Betsy; an old disused lead and silver mine pump-house.
002 by Daniel Perlak, on Flickr
006 by Daniel Perlak, on Flickr
Long exposure up the inside of the chimney stack.
010 by Daniel Perlak, on Flickr
Wish I'd had blue skies...
002 by Daniel Perlak, on Flickr
006 by Daniel Perlak, on Flickr
Long exposure up the inside of the chimney stack.
010 by Daniel Perlak, on Flickr
Wish I'd had blue skies...
Comment by Tyr posted on Dull weather but hopefully not dull photos. at 30/07/2018 - 23:09
Thanks all. Just wish flickr would allow sharing of larger images. Even the largest doesn't show the full detail on the eyes and antennae.
Fishbones wrote:
Fantastic images Dan, is it a Black Arches? Your images are superbly taken I enjoyed taking a look
Yes, it is. UKMoths.org.ukFantastic images Dan, is it a Black Arches? Your images are superbly taken I enjoyed taking a look
Comment by Tyr posted on Cute moth (really!) at 30/07/2018 - 23:04
If your camera has the dust detection system (I think K-5 onward) then it shows it as if you were looking at the sensor. It does all the reversing for you.