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Forum: Pentax SLR Lens Discussion 3 Days Ago  
Comparing Sharpness of Pentax and Third Party Wide Primes and a modern Zoom
Posted By wervog
Replies: 11
Views: 795
sorry, I thought sharing my tests could be useful to some forum members, I wont do it again. Really helpful your comment.
Forum: Pentax SLR Lens Discussion 3 Days Ago  
Comparing Sharpness of Pentax and Third Party Wide Primes and a modern Zoom
Posted By wervog
Replies: 11
Views: 795
Yes the histograms look fine, the samples shown are 1:1 crops (979*979px) from 6000*4000px images. As mentioned the newer Tamron did perform so much better than the older model and has less lens flare. Main conclusion is that i was surprised how good the modern Sigma 18-300mm Zoom performed in comparison with the older primes. Next conclusion is that each lens even of the same model could be so different. Furthermore I was really surprised about the performance of the 35mm lens, cause it has a lot more wear, than the other lenses.
Goal of the comparison was my feeling, that the smc-PENTAX 30 mm is not so sharp in the distance.So I compared it to my other lenses in this focal length range.

I did not use hoods, cause i had not hoods for all the lenses tested. Camera was a K-70. I do not own HD coated lenses right now.
Forum: Pentax SLR Lens Discussion 3 Days Ago  
Comparing Sharpness of Pentax and Third Party Wide Primes and a modern Zoom
Posted By wervog
Replies: 11
Views: 795
Look at the link in my post, there is a better image provided. Regards

---------- Post added 02-23-20 at 10:07 AM ----------


On the focus ring is a small silver ring visible, did you mean that?
Forum: Post Your Photos! 3 Days Ago  
Streets Walking in Verona
Posted By wervog
Replies: 0
Views: 134
Sometimes you can get a decent shot with a cheap underated Kit lens :). This shot isnt as sharp as it could be with a better lens but in my opinion it tells some stories.
Forum: Pentax SLR Lens Discussion 3 Days Ago  
Comparing Sharpness of Pentax and Third Party Wide Primes and a modern Zoom
Posted By wervog
Replies: 11
Views: 795
Aim here was to compare the below mentioned Lenses with Focus set to infinity. All shot were made handheld with shutter speed of 1/400 between 11:01 and 11:35 a.m. with an aperture of 8. Pictures have been cropped to show the same mountain in the distance, which has been center or near center in the uncropped images. There has been no postprocessing of any kind. All pictures were taken w/o lenshood, unless the one indicated. All pictures were taken in full manual mode with manual focussing, with exception the one indicated as AF.

Lenses:
SMC Pentax-M 28mm F2.8 Reviews - M Prime Lenses - Pentax Lens Reviews & Lens Database copy 1
SMC Pentax-M 28mm F2.8 Reviews - M Prime Lenses - Pentax Lens Reviews & Lens Database copy 2
SMC Pentax 30mm F2.8 Reviews - K Prime Lenses - Pentax Lens Reviews & Lens Database

SMC Pentax-M 35mm F2.8 Reviews - M Prime Lenses - Pentax Lens Reviews & Lens Database
Tamron Adaptall-2 24mm f/2.5 (01B) Lens Reviews - Tamron Adaptall Lenses - Pentax Lens Review Database
Tamron Adaptall-2 24mm F2.5 (01BB) Lens Reviews - Tamron Adaptall Lenses - Pentax Lens Review Database
Sigma 18-300mm F3.5-6.3 DC Macro HSM (Contemporary) Lens Reviews - Sigma Lenses - Pentax Lens Review Database

Conclusion:
At f8 interestingly there was a significant difference between 2 copies of the same 28 mm lens.

Also you can see how much better the Tamron Adaptall-2 24mm f/2.5 (01BB) performed than theTamron Adaptall-2 24mm f/2.5 (01B). Adding a lens hood (which is a very short one on this lens) did not improve the image significantly.

I was impressed of the sharpness and contrast of the 35mm lens compared to the 30mm lens.

The CA in all lenses is nearly neglectable in these shots
A modern Sigma Zoom does a decent job, which can be a little further improved by manual focusing.

Here is the better image: https://imgur.com/kbZw4yG
Forum: Pentax K-70 01-12-2020, 08:13 AM  
K-70 Video Funktion
Posted By wervog
Replies: 1
Views: 374
Hello

Could anyone answer me a question regarding the video function of the K-70. How long can a Full HD Video be continuously recorded. Is there a stop after 30 Min or 4Gb as on certain cameras, or does it record till the sd.card is full. And can the camera be charged via USB during the video recording.

Regards
Forum: Pentax DSLR Discussion 11-09-2019, 03:55 AM  
Wifi Commander for Pentax is online (Windows app)
Posted By wervog
Replies: 72
Views: 11,633
Thanks for your great work. Did I miss it or is there no possibility to set a timer before taking a picture with this app. I know I could setup planned shots, but there is no live view available. This Feature would be very useful for selfies etc.

Regards
Forum: Post Your Photos! 10-29-2019, 09:22 AM  
Nature Leaves
Posted By wervog
Replies: 2
Views: 125
nice shot
Forum: Post Your Photos! 10-29-2019, 09:18 AM  
People Anika
Posted By wervog
Replies: 15
Views: 437
good shot
Forum: Monthly Photo Contests 10-29-2019, 09:17 AM  
How to win anything ?
Posted By wervog
Replies: 2
Views: 72
defying gravity
Forum: Troubleshooting and Beginner Help 09-01-2019, 12:24 AM  
SMC Pentax-M 80-200mm lens on Pentax K-70
Posted By wervog
Replies: 11
Views: 998
Thank you for your hints. As it turns out the problem is not on the camera but on the lens. The aperture does not work properly. So i need to put the lens not to full lock.
Forum: Troubleshooting and Beginner Help 08-30-2019, 05:13 AM  
SMC Pentax-M 80-200mm lens on Pentax K-70
Posted By wervog
Replies: 11
Views: 998
I am using also a Pentax-M (100mm lens) on the K-70. I observed that the aperture does not work. Did I mess a setting on the camera ?
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