Originally posted by PhotoMike For all of you that have requested seeing more of my collection examples, I have two unique lens from Pentax.
The small lens on the right is the Pentax screw mount 17mm F/4 Fisheye. It is a surprisingly good little lens, weighing only a few ounces.
I have used this lens for many specialized applications and it has always performed well.
I use this lens with an adapter for any of my Canon DSLR cameras and all of my mirror-less cameras.
The monster to the left is the 40 pound Pentax 6X7 medium format 800mm F/4 telephoto. There are many adapters that allow this lens to connect to most every DSLR camera made.
I have been making adapters for lens for years, so now that the cost has become reasonable, it is cost effective for me to purchase them unless there is a very specialized application.
I use this lens for long distant daylight work and night time astronomical work. It requires a very stable tripod or platform to properly hold this lens in place.
I have scores of tripods ranging from 3 pounds to 150 pounds, so I am covered for this guy.
I obtain very accepted results despite the the claims that this lens is plagued by color until stopped down to F/8 and below. For this example that I hand picked from my optical lab testing, that is not a true statement.
By tuning the lens elements and aligning them , the perfromance became very good at F/4 and excellent by F/5.6 regarding color.
Both lens shown are well built having all manual controls for f-stop and focus. This is just the way I like to see a lens made.
Mike
Mike, that big Tak will surely draw some attention, it looks massive!
I would really like to know two things, which I'm sure you'll be able to answer with all the experience you've got in this field:
1. There are two camps on the forums, regarding the use of UV filters. Some say it degrades the final image and is not worth putting on a lens, and others say that it protects the lens coatings, and the impact on the final image is minimal. What do you think of the use of UV filters on lenses?
2. Can you just shortly tell us what you use to clean the lens elements, and camera sensors, and also the methods you use to do it.