excanonfd,
Originally posted by excanonfd This lens isn't going to used hand held too often, though I am sure we'll try - often.
Here is a link that might help you since you are buying this lens, for a Rokinon 105mm UV filter .
105mm UV Protective Filter for 800mm Mirror Lens | eBay
Otherwise, without filter, the front element is open, and dust will settle inside the lens. I am ordering mine today.
Re: the hood, I wish there were collapsible rubber lens hoods with 105mm diameter, but I was not able to find any in that size.
I think I will spring for the proper Samyang lens hood despite its price. Being able to put it on the lens when transporting it is worth it.
Unfortunately there doesn't seem to be any US seller for it, only foreign, Hong Kong and South Korea.
I am not quite sure about the polarizer.
I found the following 105mm front polarizer :
Professional High Definition Circular polarizer 105mm for 120-300mm 500mm 105 | eBay
$26.99 is not bad considering the 105mm size. However, the polarizer will rotate with the focus ring on this lens. This is not ideal.
I wonder if I should use a rear polarizer instead. Having both a front UV filter and rear CPL would protect the lens on both sides, also. I'm less sure what it will do to the image. 30.5mm CPLs are very cheap, starting around $5, so I guess I will try that first.
The bag for it is still a major question. The lens is fairly high, minimum 131.5mm, and that's without the t-ring or rear k-mount cap.
http://www.syopt.co.kr/common/pdf/f=800F8.0MIRROR.pdf
It might fit in a DSLR bag in the space normally designated for the body. Maybe if I find a bag for 2 bodies, it would work. I also do have 2 bodies (1 Pentax / 1 Canon), so maybe a bag for 3 bodies
? Man, this hobby is an expensive one
My current single bag DSLR bag is clearly insufficient, it won't fit both this lens and a body, and it is not weather proof, which has been an issue in the past on a couple of occasions.