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Forum: Pentax SLR Lens Discussion 01-05-2013, 10:05 PM  
M Lenses - Purple Fringe Masters
Posted By Jewelltrail
Replies: 39
Views: 3,349
The lens database here tells a story for each lens. I wouldn't say the K300 4 is not well regarded: it actually gets 9s & 10s in the reviews. It is splendidly built, very sharp, wide open even, & has nice MF ergonomics. There are lots of complaints concerning a lack of tripod mount, but the Ca issue is not consistently experienced by reviewers. The overall mean score is unduly affected by two, very low scores of 1 & 3. In both of those reviews, words like "terrible ca" and "bad fringing" abound, which leads one to believe sample variation must exist to a large degree.

JT
Forum: Pentax SLR Lens Discussion 01-05-2013, 10:21 AM  
M Lenses - Purple Fringe Masters
Posted By Jewelltrail
Replies: 39
Views: 3,349
It is worth adding that DSLR sensors play a large role in "blooming" issues. Particularly with the CCD sensors found in many DSLRs does blooming become an issue, whereas CMOS sensors handle the issue much better. The subject can get complex, but there is some good discussion here, with endless more to be found in a Goolge search:

OK1000 Pentax Blog: Reducing Purple Fringing and Sensor Blooms
Forum: Pentax SLR Lens Discussion 01-05-2013, 12:51 AM  
Wanting to by a new lens, stuck on which one?
Posted By Jewelltrail
Replies: 23
Views: 1,943
You really need to decide how much subject isolation you want. I've gotten some great kid shots with my Tamron 90mm, but they are nowhere near as special as ones that can be gotten from faster glass, or from longer glass of the same 2,8 aperture. Good luck
Forum: Pentax SLR Lens Discussion 01-05-2013, 12:41 AM  
M Lenses - Purple Fringe Masters
Posted By Jewelltrail
Replies: 39
Views: 3,349
I owned several M-series lenses & shot them on my K20d. As Steve says above, the 50 f/1.7 & 200 f/4 were no problem. However, the most fringing/CAs I"ve ever seen on digital were with the M 300 f/4. It was a beautifully built lens, & I had a mint copy, but could not deal with the fringing/CAs. If you used it selectively, excellent shots were possible.

JT

EDIT:My apology, I left Pentax a couple of years ago & all my efforts have been in Nikon ever since. I made a mistake---It was not the M 300 f/4 which was so poor--It was the K 300 f/4. My experience with the M 50 1.7 & 200 f/4 is accurate.
Forum: Pentax SLR Lens Discussion 12-25-2012, 10:40 PM  
Looking for wide options
Posted By Jewelltrail
Replies: 16
Views: 1,748
I like the Sigma 12-24: with version II out, you can pick version1 up in the $300 range. It is virtually distortion free & evenly sharp to the edges on crop sensor. From about 15mm to 24mm filters can be used. It does a nice job with flare though Ca can be a problem, however, the latter easily PPs out. Oh, icing on the cake is that it is splendidly built. :)

I love it because it works on my Fx and Dx bodies. If Pentax ever gets an FFer, you are in business. Here are a few on crop sensor--Good Luck Btw, the Sigma 15-30 is good n' sharp & in this price range too.

15mm


12mm


24mm

Forum: Sold Items 06-09-2012, 10:32 PM  
For Sale - Sold: Kiron 105mm f/2.8 Macro 1:1 (price reduced)
Posted By Jewelltrail
Replies: 12
Views: 3,032
You are welcome! :) Here is a recent shot I did with this lens on 1 of my Nikon bodies. Hope this is ok--if not, let me know & I'll glad remove. No crop--f/11JT


Forum: Lens Clubs 05-21-2012, 08:03 PM  
SIGMA 10-20mm CLUB
Posted By Jewelltrail
Replies: 3,714
Views: 757,207
Yes, you can--adapters vary in price, from inexpensive to expensive--Google search and find all you want to know. Great camera BTW.

JT
Forum: Lens Clubs 05-20-2012, 09:53 PM  
SIGMA 10-20mm CLUB
Posted By Jewelltrail
Replies: 3,714
Views: 757,207
Okay, for added clarity I will post this shot too. This shot did not have a polarizer on the lens, nor a UV filter. I suggest avoiding UV filters on digital for optimum quality--my 2 cents. Anway, this shot is done on Full-frame sensor, with the 17mm Tamron f/3.5 Adaptall lens. Look at the deformation of color uniformity, ie, the left side of the frame has a much lighter blue than the right side. However, this has nothing to do with a polarizer; rather, it has everything do so with the composition's proximity to the Sun. In other words, the Sun is directly to the left of the composition, just outside of the most left portion of the shot. 17mm on FF is close to 11mm on APS-c.
JT

This shot is @ f/3.5, or wide open on the Tammy adaptall.

Forum: Lens Clubs 05-20-2012, 09:42 PM  
SIGMA 10-20mm CLUB
Posted By Jewelltrail
Replies: 3,714
Views: 757,207
Hi: want to offer my experience with this lens and a polarizer. I used a B & W (not cheap) Linear Polarizer &, even @ 10mm, never had deformations of color uniformity. The sky, especially in areas closest to the sun, will obviously show less intensity of the color blue--but this is visible to the naked eye alone. This discussion was already handled here in the club, with examples provided. I'll post 1 more example here for simplicity.

Sorry, about my late reply. I left Pentax over a year ago, pullled to the Dark side by the allure of full-frame and more lens options. I now have responsibilities to other forums, and I'm still trying to learn all things Nikon, even after a year. Feel free to ask more questions if you feel I can be of help--BEST!

JT


10mm---NO CROP

Forum: Sold Items 05-19-2012, 09:32 AM  
For Sale - Sold: Kiron 105mm f/2.8 Macro 1:1 (price reduced)
Posted By Jewelltrail
Replies: 12
Views: 3,032
Bumping this amazing piece of glass, with legendary credentials. I've got one, in Nikon mount, and it is made like a work of art, with half stop detents on the A-ring an superb manual focus ergonomics. Do a Google search to learn more about this little baby.

JT
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 04-27-2012, 09:07 PM  
Some Full-frame shots & thoughts
Posted By Jewelltrail
Replies: 5,513
Views: 550,997
Beautiful shots Alf!
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 04-27-2012, 09:04 PM  
Some Full-frame shots & thoughts
Posted By Jewelltrail
Replies: 5,513
Views: 550,997
That is much higher than here, where I see new ones going for $2199, though they can be tough to find in stock. However, used ones (particularly given the 150k shutter lives) make a great choice too.

JT
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 04-26-2012, 09:40 PM  
Some Full-frame shots & thoughts
Posted By Jewelltrail
Replies: 5,513
Views: 550,997
This is what the D700 is for. :)

JT
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 04-26-2012, 09:23 PM  
Some Full-frame shots & thoughts
Posted By Jewelltrail
Replies: 5,513
Views: 550,997
Won this lens on Ebay--was not sure what to expect. Got a chance to do some shooting with it recently and am impressed for what my $12 and 50 cents is doing for me. Here are some shots, following the Ebay screen shot. All shots on D700--No crops


Wide-Open @ 185mm



F/9 Short End



F/5



90mm & Wide-Open



300mm & f/8 (D700 Exif reads 270mm)

Forum: Lens Clubs 04-24-2012, 05:33 AM  
SIGMA 10-20mm CLUB
Posted By Jewelltrail
Replies: 3,714
Views: 757,207
Hi Amama:

I so much miss my days shooting with this lens. When I was active with it, I had good knowledge of all the major, as well as subtle differences between the 2 versions, If you carefully sift through this thread, you'll find discussion on the differences--in depth at times even. Off the top of my memory, so please do not quote me here, I'll try and quickly review some differences, aside from the obvious ones: price--speed--fixed aperture

3.5 version reported to handle flare a little better, though the 4-5.6 is no slouch for UWA. 3.5 versions has an extra A-Blade, given it an odd total, which makes for nice sun flares--distinct points. Reports (I believe SLR, for example) say 4-5.6 is sharper at the long end. Also, @ 10mm (according to Photozone) I believe the 4-5.6 version is better in the extreme borders while the lenses are close elsewhere @ 10mm. 3.5 version reportedly a little better with vignetting and with distortions. Feel free to Google subject and report back here anything you can add tot he discussion. Thanks and Happy Shooting!

JT
Forum: Lens Clubs 04-24-2012, 05:24 AM  
SIGMA 10-20mm CLUB
Posted By Jewelltrail
Replies: 3,714
Views: 757,207
Sweet Tim!

:)
Forum: Lens Clubs 04-24-2012, 05:20 AM  
SIGMA 10-20mm CLUB
Posted By Jewelltrail
Replies: 3,714
Views: 757,207
Ah. music for my soul Tamia! The ADKs are so beautiful & I have so many spectacular moments spent there. The pics are splendid, as always. BTW, the native Americans believed Jewelweed had medicinal properties, specifically for Poison Ivy--if I'm not mistaken. I think it is still marketed today as a natural remedy. I really hope to make it back to my beloved ADKS soon, but am glad I have you shooting there and showing images here in the meantime!!! :) Thanks Tamia. :)

JT
Forum: Lens Clubs 04-24-2012, 05:14 AM  
SIGMA 10-20mm CLUB
Posted By Jewelltrail
Replies: 3,714
Views: 757,207
These are excellent Ivor. :)

JT
Forum: Lens Clubs 04-08-2012, 07:04 PM  
SIGMA 10-20mm CLUB
Posted By Jewelltrail
Replies: 3,714
Views: 757,207
Hey there Tamia--I haven't been in the ADKs since Foliage time of last year, so this is a real treat for me--thank you! I probably will not make it up there again until this coming foliage season, so PLEASE keep posting when you can. I've always loved your work! Best!

JT
Forum: Lens Clubs 04-08-2012, 07:01 PM  
SIGMA 10-20mm CLUB
Posted By Jewelltrail
Replies: 3,714
Views: 757,207
Making excellent contributions for creative use of the lens! :)

JT
Forum: Lens Clubs 04-08-2012, 06:57 PM  
SIGMA 10-20mm CLUB
Posted By Jewelltrail
Replies: 3,714
Views: 757,207
Most excellent use of the 10mm focal length Mike! :)


JT
Forum: Lens Clubs 04-08-2012, 06:55 PM  
SIGMA 10-20mm CLUB
Posted By Jewelltrail
Replies: 3,714
Views: 757,207
My favorite here is the 3rd one. :)
Forum: Lens Clubs 04-08-2012, 06:51 PM  
SIGMA 10-20mm CLUB
Posted By Jewelltrail
Replies: 3,714
Views: 757,207
Excellent!
Forum: Lens Clubs 04-08-2012, 06:48 PM  
SIGMA 10-20mm CLUB
Posted By Jewelltrail
Replies: 3,714
Views: 757,207
Enjoying both very much, especially the 2nd one. Thanks!

:)
Forum: Lens Clubs 04-08-2012, 06:44 PM  
SIGMA 10-20mm CLUB
Posted By Jewelltrail
Replies: 3,714
Views: 757,207
Love the mood created here!

:)
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